diff --git a/test/bats/unit-tests.bats b/test/bats/unit-tests.bats
index daa202c..1a070d1 100644
--- a/test/bats/unit-tests.bats
+++ b/test/bats/unit-tests.bats
@@ -5,12 +5,14 @@ load test_helper
 NVM_SRC_DIR="${BATS_TEST_DIRNAME}/../.."
 source "${NVM_SRC_DIR}/nvm.sh"
 
+FIXTURES_DIR="${NVM_SRC_DIR}/test/fixtures"
+
 test_debug() {
     false # set to 'true' to get setup/teardown in test stderr
 }
 
 test_implementing() {
-    true # set to 'false' to run all tests; set to 'true' to skip implemented tests
+    false # set to 'false' to run all tests; set to 'true' to skip implemented tests
     # only used while porting to bats: remove afterward
 }
 
@@ -31,955 +33,355 @@ teardown() {
 }
 
 @test './Unit tests/nvm_alias' {
+    test_implementing && skip
 
     run nvm_alias
-    assert_equal 1 "$status" "nvm_alias should exit with code 1"
+    assert_equal 1 "$status" "nvm_alias should exit with code 1 for missing"
     assert_match "$output" "An alias is required."
-##!/bin/sh
-#
-#die () { echo $@ ; cleanup ; exit 1; }
-#
-#cleanup () {
-#  rm -rf ../../../alias/test
-#}
-#
-#. ../../../nvm.sh
-#
-#OUTPUT="$(nvm_alias 2>&1)"
-#EXPECTED_OUTPUT='An alias is required.'
-#[ "_$OUTPUT" = "_$EXPECTED_OUTPUT" ] || die "
-#
-#EXIT_CODE="$(nvm_alias >/dev/null 2>&1 ; echo $?)"
-#[ "_$EXIT_CODE" = "_1" ] || die "'nvm_alias' exited with $EXIT_CODE, expected 1"
-#
-#rm -rf ../../../alias/nonexistent
-#
-#OUTPUT="$(nvm_alias nonexistent 2>&1)"
-#EXPECTED_OUTPUT='Alias does not exist.'
-#[ "_$OUTPUT" = "_$EXPECTED_OUTPUT" ] || die "'nvm_alias nonexistent' produced wrong output; got $OUTPUT"
-#
-#EXIT_CODE="$(nvm_alias nonexistent >/dev/null 2>&1 ; echo $?)"
-#[ "_$EXIT_CODE" = "_2" ] || die "'nvm_alias nonexistent' exited with $EXIT_CODE, expected 2"
-#
-#EXPECTED_OUTPUT="0.10"
-#nvm alias test "$EXPECTED_OUTPUT" || die "'nvm alias test $EXPECTED_OUTPUT' failed"
-#OUTPUT="$(nvm_alias test)"
-#[ "_$OUTPUT" = "_$EXPECTED_OUTPUT" ] || die "'nvm_alias test' produced wrong output; got $OUTPUT"
-#
-#cleanup
-#
+
+    run nvm_alias nonexistent
+    assert_equal 2 "$status" "nvm_alias should exit with code 2 for nonexistent"
+    assert_match "$output" "Alias does not exist."
+    
+    run nvm alias test "0.10"
+    run nvm_alias test
+    assert_match "$output" "0.10" "nvm_alias test produced wrong output"
 }
 
 @test './Unit tests/nvm_checksum' {
-##!/bin/sh
-#
-#cleanup () {
-#  rm tmp/emptyfile tmp/testfile
-#  rmdir tmp
-#}
-#die () { echo $@ ; cleanup; exit 1; }
-#
-#. ../../../nvm.sh
-#
-#mkdir -p tmp
-#touch tmp/emptyfile
-#echo -n "test" > tmp/testfile
-#
-#nvm_checksum tmp/emptyfile "da39a3ee5e6b4b0d3255bfef95601890afd80709" || die "nvm_checksum on an empty file did not match the SHA1 digest of the empty string"
-#nvm_checksum tmp/testfile "da39a3ee5e6b4b0d3255bfef95601890afd80709" && die "nvm_checksum allowed a bad checksum"
-#
-#cleanup
+    test_implementing && skip
+
+    mkdir -p tmp
+    touch tmp/emptyfile
+    echo -n "test" > tmp/testfile
+
+    run nvm_checksum tmp/emptyfile "da39a3ee5e6b4b0d3255bfef95601890afd80709"
+    assert_equal 0 "$status" "nvm_checksum on empty file did not match SHA1 of empty string"
+
+    run nvm_checksum tmp/testfile  "da39a3ee5e6b4b0d3255bfef95601890afd80709"
+    assert_equal 1 "$status" "nvm_checksum allowed a bad checksum"
 }
 
 @test './Unit tests/nvm_find_up' {
-##!/bin/sh
-#
-#die () { echo $@ ; cleanup ; exit 1; }
-#setup() {
-#  cleanup
-#  mkdir -p tmp_nvm_find_up/a/b/c/d
-#  touch tmp_nvm_find_up/test
-#  touch tmp_nvm_find_up/a/b/c/test
-#}
-#cleanup () {
-#  rm -rf tmp_nvm_find_up
-#}
-#
-#. ../../../nvm.sh
-#
-#setup
-#
-#TEST_DIR="$PWD"
-#
-#[ "~$(PWD=$TEST_DIR/tmp_nvm_find_up/a nvm_find_up 'test')" = "~$TEST_DIR/tmp_nvm_find_up" ] || die "failed to find 1 dir up"
-#[ "~$(PWD=$TEST_DIR/tmp_nvm_find_up/a/b nvm_find_up 'test')" = "~$TEST_DIR/tmp_nvm_find_up" ] || die "failed to find 2 dirs up"
-#[ "~$(PWD=$TEST_DIR/tmp_nvm_find_up/a/b/c nvm_find_up 'test')" = "~$TEST_DIR/tmp_nvm_find_up/a/b/c" ] || die "failed to find in current dir"
-#[ "~$(PWD=$TEST_DIR/tmp_nvm_find_up/a/b/c/d nvm_find_up 'test')" = "~$TEST_DIR/tmp_nvm_find_up/a/b/c" ] || die "failed to find 1 level up from current dir"
-#
-#cleanup
-#
+    test_implementing && skip
+
+    mkdir -p tmp_nvm_find_up/a/b/c/d
+    touch tmp_nvm_find_up/test
+    touch tmp_nvm_find_up/a/b/c/test
+
+    output="$(PWD=${PWD}/tmp_nvm_find_up/a nvm_find_up 'test')"
+    assert_equal "${PWD}/tmp_nvm_find_up" "$output" "failed to find 1 dir up"
+
+    output="$(PWD=${PWD}/tmp_nvm_find_up/a/b nvm_find_up 'test')"
+    assert_equal "${PWD}/tmp_nvm_find_up" "$output" "failed to find 2 dirs up"
+    
+    output="$(PWD=${PWD}/tmp_nvm_find_up/a/b/c nvm_find_up 'test')"
+    assert_equal "${PWD}/tmp_nvm_find_up/a/b/c" "$output" "failed to find in current dir"
+
+    output="$(PWD=${PWD}/tmp_nvm_find_up/a/b/c/d nvm_find_up 'test')"
+    assert_equal "${PWD}/tmp_nvm_find_up/a/b/c" "$output" "failed to find 1 up from current dir"
+
 }
 
 @test './Unit tests/nvm_format_version' {
-##!/bin/sh
-#
-#die () { echo $@ ; exit 1; }
-#
-#. ../../../nvm.sh
-#
-#OUTPUT="$(nvm_format_version 0.1.2)"
-#EXPECTED_OUTPUT="v0.1.2"
-#[ "_$OUTPUT" = "_$EXPECTED_OUTPUT" ] || die "nvm_format_version 0.1.2 did not return $EXPECTED_OUTPUT; got $OUTPUT"
-#
-#OUTPUT="$(nvm_format_version 0.1)"
-#EXPECTED_OUTPUT="v0.1.0"
-#[ "_$OUTPUT" = "_$EXPECTED_OUTPUT" ] || die "nvm_format_version 0.1.0 did not return $EXPECTED_OUTPUT; got $OUTPUT"
-#
+    test_implementing && skip
+
+    run nvm_format_version 0.1.2
+    assert_equal "v0.1.2" "$output"
+
+    run nvm_format_version 0.1
+    assert_equal "v0.1.0" "$output"
 }
 
 @test './Unit tests/nvm_has' {
-##!/bin/sh
-#
-#die () { echo $@ ; exit 1; }
-#
-#. ../../../nvm.sh
-#
-#nvm_has cat && type cat > /dev/null || die 'nvm_has locates "cat" properly'
-#
-#[ "~$(nvm_has foobarbaz 2>&1)" = "~" ] || die "nvm_has does not suppress error output"
-#
-#! nvm_has foobarbaz && ! type foobarbaz >/dev/null 2>&1 || die "nvm_has does not return a nonzero exit code when not found"
-#
+    test_implementing && skip
+
+    nvm_has cat
+    type cat
+
+    ! nvm_has foobarbaz
+    ! type foobarbaz
 }
 
 @test './Unit tests/nvm_has_system_node' {
-##!/bin/sh
-#
-#cleanup () {
-#  rm ../../../v0.1.2/node
-#  rmdir ../../../v0.1.2
-#}
-#die () { echo $@ ; exit 1; }
-#
-#. ../../../nvm.sh
-#
-#mkdir ../../../v0.1.2
-#touch ../../../v0.1.2/node
-#
-#nvm use 0.1.2
-#
-#if command -v node; then
-#  nvm_has_system_node
-#else
-#  ! nvm_has_system_node
-#fi
-#
-#nvm deactivate /dev/null 2>&1
-#
-#if command -v node; then
-#  nvm_has_system_node
-#else
-#  ! nvm_has_system_node
-#fi
-#
+    test_implementing && skip
+
+    mkdir v0.1.2
+    touch v0.1.2/node
+
+    nvm use 0.1.2
+
+    if command -v node; then
+        nvm_has_system_node
+    else
+        ! nvm_has_system_node
+    fi
+
+    nvm deactivate
+
+    if command -v node; then
+        nvm_has_system_node
+    else
+        ! nvm_has_system_node
+    fi
 }
 
 @test './Unit tests/nvm_ls_current' {
-##!/bin/sh
-#
-#die () { echo $@ ; exit 1; }
-#
-#. ../../../nvm.sh
-#
-#return_zero () { return 0; }
-#
-#[ "$(nvm deactivate > /dev/null 2>&1 ; nvm_ls_current)" = "system" ] || die 'when deactivated, did not return "system"'
-#
-#TEST_PWD=$(pwd)
-#TEST_DIR="$TEST_PWD/nvm_ls_current_tmp"
-#rm -rf "$TEST_DIR"
-#mkdir "$TEST_DIR"
-#ln -s "$(which which)" "$TEST_DIR/which"
-#ln -s "$(which dirname)" "$TEST_DIR/dirname"
-#
-#[ "$(PATH="$TEST_DIR" nvm_ls_current)" = "none" ] || die 'when node not installed, nvm_ls_current did not return "none"'
-#[ "@$(PATH="$TEST_DIR" nvm_ls_current 2> /dev/stdout 1> /dev/null)@" = "@@" ] || die 'when node not installed, nvm_ls_current returned error output'
-#
-#echo "#!/bin/bash" > "$TEST_DIR/node"
-#echo "echo 'VERSION FOO!'" > "$TEST_DIR/node"
-#chmod a+x "$TEST_DIR/node"
-#
-#[ "$(alias nvm_tree_contains_path='return_zero' && PATH="$TEST_DIR" nvm_ls_current)" = "VERSION FOO!" ] || die 'when activated, did not return nvm node version'
-#
-#rm -rf "$TEST_DIR"
-#
+    test_implementing && skip
+
+    nvm deactivate
+    run nvm_ls_current
+    assert_match "$output" "system" "when deactivated did not return 'system'"
+
+    rm -fr nvm_ls_current_tmp
+    mkdir -p nvm_ls_current_tmp
+    TDIR="${PWD}/nvm_ls_current_tmp"
+
+    ln -s "$(which which)" "$TDIR/which"
+    ln -s "$(which dirname)" "$TDIR/dirname"
+    
+    output="$(PATH=${TDIR} nvm_ls_current || true)"
+    assert_match "$output" "none" "when node not installed, nvm_ls_current should return 'none'"
+    
+    echo "#!/bin/bash" > node
+    echo "echo 'VERSION FOO!'" >> node
+    chmod a+x node
+
+    nvm_tree_contains_path() {
+        return 0
+    }
+    output="$(PATH=${TDIR} nvm_ls_current || true)"
+    assert_match "$output" "none" "when activated 'nvm_ls_current' should return 'noe'"
 }
 
 @test './Unit tests/nvm_ls_remote' {
-##!/bin/sh
-#
-#die () { echo $@ ; cleanup ; exit 1; }
-#
-#cleanup() {
-#  unset -f nvm_download
-#}
-#
-#. ../../../nvm.sh
-#
-## sample output at the time the test was written
-#nvm_download() {
-#  echo 'foo "v0.10.0'
-#  echo 'foo "v0.10.0'
-#  echo 'foo "v0.10.1'
-#  echo 'foo "v0.10.1'
-#  echo 'foo "v0.10.10'
-#  echo 'foo "v0.10.10'
-#  echo 'foo "v0.10.11'
-#  echo 'foo "v0.10.11'
-#  echo 'foo "v0.10.12'
-#  echo 'foo "v0.10.12'
-#  echo 'foo "v0.10.13'
-#  echo 'foo "v0.10.13'
-#  echo 'foo "v0.10.14'
-#  echo 'foo "v0.10.14'
-#  echo 'foo "v0.10.15'
-#  echo 'foo "v0.10.15'
-#  echo 'foo "v0.10.16'
-#  echo 'foo "v0.10.16'
-#  echo 'foo "v0.10.16'
-#  echo 'foo "v0.10.16'
-#  echo 'foo "v0.10.17'
-#  echo 'foo "v0.10.17'
-#  echo 'foo "v0.10.18'
-#  echo 'foo "v0.10.18'
-#  echo 'foo "v0.10.19'
-#  echo 'foo "v0.10.19'
-#  echo 'foo "v0.10.2'
-#  echo 'foo "v0.10.2'
-#  echo 'foo "v0.10.20'
-#  echo 'foo "v0.10.20'
-#  echo 'foo "v0.10.21'
-#  echo 'foo "v0.10.21'
-#  echo 'foo "v0.10.22'
-#  echo 'foo "v0.10.22'
-#  echo 'foo "v0.10.23'
-#  echo 'foo "v0.10.23'
-#  echo 'foo "v0.10.24'
-#  echo 'foo "v0.10.24'
-#  echo 'foo "v0.10.25'
-#  echo 'foo "v0.10.25'
-#  echo 'foo "v0.10.26'
-#  echo 'foo "v0.10.26'
-#  echo 'foo "v0.10.27'
-#  echo 'foo "v0.10.27'
-#  echo 'foo "v0.10.28'
-#  echo 'foo "v0.10.28'
-#  echo 'foo "v0.10.29'
-#  echo 'foo "v0.10.29'
-#  echo 'foo "v0.10.3'
-#  echo 'foo "v0.10.3'
-#  echo 'foo "v0.10.30'
-#  echo 'foo "v0.10.30'
-#  echo 'foo "v0.10.31'
-#  echo 'foo "v0.10.31'
-#  echo 'foo "v0.10.32'
-#  echo 'foo "v0.10.32'
-#  echo 'foo "v0.10.4'
-#  echo 'foo "v0.10.4'
-#  echo 'foo "v0.10.5'
-#  echo 'foo "v0.10.5'
-#  echo 'foo "v0.10.6'
-#  echo 'foo "v0.10.6'
-#  echo 'foo "v0.10.7'
-#  echo 'foo "v0.10.7'
-#  echo 'foo "v0.10.8'
-#  echo 'foo "v0.10.8'
-#  echo 'foo "v0.10.9'
-#  echo 'foo "v0.10.9'
-#  echo 'foo "v0.11.0'
-#  echo 'foo "v0.11.0'
-#  echo 'foo "v0.11.1'
-#  echo 'foo "v0.11.1'
-#  echo 'foo "v0.11.10'
-#  echo 'foo "v0.11.10'
-#  echo 'foo "v0.11.11'
-#  echo 'foo "v0.11.11'
-#  echo 'foo "v0.11.12'
-#  echo 'foo "v0.11.12'
-#  echo 'foo "v0.11.13'
-#  echo 'foo "v0.11.13'
-#  echo 'foo "v0.11.14'
-#  echo 'foo "v0.11.14'
-#  echo 'foo "v0.11.2'
-#  echo 'foo "v0.11.2'
-#  echo 'foo "v0.11.3'
-#  echo 'foo "v0.11.3'
-#  echo 'foo "v0.11.4'
-#  echo 'foo "v0.11.4'
-#  echo 'foo "v0.11.5'
-#  echo 'foo "v0.11.5'
-#  echo 'foo "v0.11.6'
-#  echo 'foo "v0.11.6'
-#  echo 'foo "v0.11.7'
-#  echo 'foo "v0.11.7'
-#  echo 'foo "v0.11.8'
-#  echo 'foo "v0.11.8'
-#  echo 'foo "v0.11.9'
-#  echo 'foo "v0.11.9'
-#  echo 'foo "v0.5.1'
-#  echo 'foo "v0.5.1'
-#  echo 'foo "v0.5.10'
-#  echo 'foo "v0.5.10'
-#  echo 'foo "v0.5.2'
-#  echo 'foo "v0.5.2'
-#  echo 'foo "v0.5.3'
-#  echo 'foo "v0.5.3'
-#  echo 'foo "v0.5.4'
-#  echo 'foo "v0.5.4'
-#  echo 'foo "v0.5.5'
-#  echo 'foo "v0.5.5'
-#  echo 'foo "v0.5.6'
-#  echo 'foo "v0.5.6'
-#  echo 'foo "v0.5.7'
-#  echo 'foo "v0.5.7'
-#  echo 'foo "v0.5.8'
-#  echo 'foo "v0.5.8'
-#  echo 'foo "v0.5.9'
-#  echo 'foo "v0.5.9'
-#  echo 'foo "v0.6.0'
-#  echo 'foo "v0.6.0'
-#  echo 'foo "v0.6.1'
-#  echo 'foo "v0.6.1'
-#  echo 'foo "v0.6.10'
-#  echo 'foo "v0.6.10'
-#  echo 'foo "v0.6.11'
-#  echo 'foo "v0.6.11'
-#  echo 'foo "v0.6.12'
-#  echo 'foo "v0.6.12'
-#  echo 'foo "v0.6.13'
-#  echo 'foo "v0.6.13'
-#  echo 'foo "v0.6.14'
-#  echo 'foo "v0.6.14'
-#  echo 'foo "v0.6.15'
-#  echo 'foo "v0.6.15'
-#  echo 'foo "v0.6.16'
-#  echo 'foo "v0.6.16'
-#  echo 'foo "v0.6.17'
-#  echo 'foo "v0.6.17'
-#  echo 'foo "v0.6.18'
-#  echo 'foo "v0.6.18'
-#  echo 'foo "v0.6.19'
-#  echo 'foo "v0.6.19'
-#  echo 'foo "v0.6.2'
-#  echo 'foo "v0.6.2'
-#  echo 'foo "v0.6.20'
-#  echo 'foo "v0.6.20'
-#  echo 'foo "v0.6.21'
-#  echo 'foo "v0.6.21'
-#  echo 'foo "v0.6.3'
-#  echo 'foo "v0.6.3'
-#  echo 'foo "v0.6.4'
-#  echo 'foo "v0.6.4'
-#  echo 'foo "v0.6.5'
-#  echo 'foo "v0.6.5'
-#  echo 'foo "v0.6.6'
-#  echo 'foo "v0.6.6'
-#  echo 'foo "v0.6.7'
-#  echo 'foo "v0.6.7'
-#  echo 'foo "v0.6.8'
-#  echo 'foo "v0.6.8'
-#  echo 'foo "v0.6.9'
-#  echo 'foo "v0.6.9'
-#  echo 'foo "v0.7.0'
-#  echo 'foo "v0.7.0'
-#  echo 'foo "v0.7.1'
-#  echo 'foo "v0.7.1'
-#  echo 'foo "v0.7.10'
-#  echo 'foo "v0.7.10'
-#  echo 'foo "v0.7.11'
-#  echo 'foo "v0.7.11'
-#  echo 'foo "v0.7.12'
-#  echo 'foo "v0.7.12'
-#  echo 'foo "v0.7.2'
-#  echo 'foo "v0.7.2'
-#  echo 'foo "v0.7.3'
-#  echo 'foo "v0.7.3'
-#  echo 'foo "v0.7.4'
-#  echo 'foo "v0.7.4'
-#  echo 'foo "v0.7.5'
-#  echo 'foo "v0.7.5'
-#  echo 'foo "v0.7.6'
-#  echo 'foo "v0.7.6'
-#  echo 'foo "v0.7.7'
-#  echo 'foo "v0.7.7'
-#  echo 'foo "v0.7.8'
-#  echo 'foo "v0.7.8'
-#  echo 'foo "v0.7.9'
-#  echo 'foo "v0.7.9'
-#  echo 'foo "v0.8.0'
-#  echo 'foo "v0.8.0'
-#  echo 'foo "v0.8.1'
-#  echo 'foo "v0.8.1'
-#  echo 'foo "v0.8.10'
-#  echo 'foo "v0.8.10'
-#  echo 'foo "v0.8.11'
-#  echo 'foo "v0.8.11'
-#  echo 'foo "v0.8.12'
-#  echo 'foo "v0.8.12'
-#  echo 'foo "v0.8.13'
-#  echo 'foo "v0.8.13'
-#  echo 'foo "v0.8.14'
-#  echo 'foo "v0.8.14'
-#  echo 'foo "v0.8.15'
-#  echo 'foo "v0.8.15'
-#  echo 'foo "v0.8.16'
-#  echo 'foo "v0.8.16'
-#  echo 'foo "v0.8.17'
-#  echo 'foo "v0.8.17'
-#  echo 'foo "v0.8.18'
-#  echo 'foo "v0.8.18'
-#  echo 'foo "v0.8.19'
-#  echo 'foo "v0.8.19'
-#  echo 'foo "v0.8.2'
-#  echo 'foo "v0.8.2'
-#  echo 'foo "v0.8.20'
-#  echo 'foo "v0.8.20'
-#  echo 'foo "v0.8.21'
-#  echo 'foo "v0.8.21'
-#  echo 'foo "v0.8.22'
-#  echo 'foo "v0.8.22'
-#  echo 'foo "v0.8.23'
-#  echo 'foo "v0.8.23'
-#  echo 'foo "v0.8.24'
-#  echo 'foo "v0.8.24'
-#  echo 'foo "v0.8.25'
-#  echo 'foo "v0.8.25'
-#  echo 'foo "v0.8.26'
-#  echo 'foo "v0.8.26'
-#  echo 'foo "v0.8.27'
-#  echo 'foo "v0.8.27'
-#  echo 'foo "v0.8.28'
-#  echo 'foo "v0.8.28'
-#  echo 'foo "v0.8.3'
-#  echo 'foo "v0.8.3'
-#  echo 'foo "v0.8.4'
-#  echo 'foo "v0.8.4'
-#  echo 'foo "v0.8.5'
-#  echo 'foo "v0.8.5'
-#  echo 'foo "v0.8.6'
-#  echo 'foo "v0.8.6'
-#  echo 'foo "v0.8.7'
-#  echo 'foo "v0.8.7'
-#  echo 'foo "v0.8.8'
-#  echo 'foo "v0.8.8'
-#  echo 'foo "v0.8.9'
-#  echo 'foo "v0.8.9'
-#  echo 'foo "v0.9.0'
-#  echo 'foo "v0.9.0'
-#  echo 'foo "v0.9.1'
-#  echo 'foo "v0.9.1'
-#  echo 'foo "v0.9.10'
-#  echo 'foo "v0.9.10'
-#  echo 'foo "v0.9.11'
-#  echo 'foo "v0.9.11'
-#  echo 'foo "v0.9.12'
-#  echo 'foo "v0.9.12'
-#  echo 'foo "v0.9.2'
-#  echo 'foo "v0.9.2'
-#  echo 'foo "v0.9.3'
-#  echo 'foo "v0.9.3'
-#  echo 'foo "v0.9.4'
-#  echo 'foo "v0.9.4'
-#  echo 'foo "v0.9.5'
-#  echo 'foo "v0.9.5'
-#  echo 'foo "v0.9.6'
-#  echo 'foo "v0.9.6'
-#  echo 'foo "v0.9.7'
-#  echo 'foo "v0.9.7'
-#  echo 'foo "v0.9.8'
-#  echo 'foo "v0.9.8'
-#  echo 'foo "v0.9.9'
-#  echo 'foo "v0.9.9'
-#  echo 'foo "v0.1.100'
-#  echo 'foo "v0.1.100'
-#  echo 'foo "v0.1.101'
-#  echo 'foo "v0.1.101'
-#  echo 'foo "v0.1.102'
-#  echo 'foo "v0.1.102'
-#  echo 'foo "v0.1.103'
-#  echo 'foo "v0.1.103'
-#  echo 'foo "v0.1.104'
-#  echo 'foo "v0.1.104'
-#  echo 'foo "v0.1.14'
-#  echo 'foo "v0.1.14'
-#  echo 'foo "v0.1.15'
-#  echo 'foo "v0.1.15'
-#  echo 'foo "v0.1.16'
-#  echo 'foo "v0.1.16'
-#  echo 'foo "v0.1.17'
-#  echo 'foo "v0.1.17'
-#  echo 'foo "v0.1.18'
-#  echo 'foo "v0.1.18'
-#  echo 'foo "v0.1.19'
-#  echo 'foo "v0.1.19'
-#  echo 'foo "v0.1.20'
-#  echo 'foo "v0.1.20'
-#  echo 'foo "v0.1.21'
-#  echo 'foo "v0.1.21'
-#  echo 'foo "v0.1.22'
-#  echo 'foo "v0.1.22'
-#  echo 'foo "v0.1.23'
-#  echo 'foo "v0.1.23'
-#  echo 'foo "v0.1.24'
-#  echo 'foo "v0.1.24'
-#  echo 'foo "v0.1.25'
-#  echo 'foo "v0.1.25'
-#  echo 'foo "v0.1.26'
-#  echo 'foo "v0.1.26'
-#  echo 'foo "v0.1.27'
-#  echo 'foo "v0.1.27'
-#  echo 'foo "v0.1.28'
-#  echo 'foo "v0.1.28'
-#  echo 'foo "v0.1.29'
-#  echo 'foo "v0.1.29'
-#  echo 'foo "v0.1.30'
-#  echo 'foo "v0.1.30'
-#  echo 'foo "v0.1.31'
-#  echo 'foo "v0.1.31'
-#  echo 'foo "v0.1.32'
-#  echo 'foo "v0.1.32'
-#  echo 'foo "v0.1.33'
-#  echo 'foo "v0.1.33'
-#  echo 'foo "v0.1.90'
-#  echo 'foo "v0.1.90'
-#  echo 'foo "v0.1.91'
-#  echo 'foo "v0.1.91'
-#  echo 'foo "v0.1.92'
-#  echo 'foo "v0.1.92'
-#  echo 'foo "v0.1.93'
-#  echo 'foo "v0.1.93'
-#  echo 'foo "v0.1.94'
-#  echo 'foo "v0.1.94'
-#  echo 'foo "v0.1.95'
-#  echo 'foo "v0.1.95'
-#  echo 'foo "v0.1.96'
-#  echo 'foo "v0.1.96'
-#  echo 'foo "v0.1.97'
-#  echo 'foo "v0.1.97'
-#  echo 'foo "v0.1.98'
-#  echo 'foo "v0.1.98'
-#  echo 'foo "v0.1.99'
-#  echo 'foo "v0.1.99'
-#  echo 'foo "v0.10.14'
-#  echo 'foo "v0.10.14'
-#  echo 'foo "v0.2.0'
-#  echo 'foo "v0.2.0'
-#  echo 'foo "v0.2.1'
-#  echo 'foo "v0.2.1'
-#  echo 'foo "v0.2.2'
-#  echo 'foo "v0.2.2'
-#  echo 'foo "v0.2.3'
-#  echo 'foo "v0.2.3'
-#  echo 'foo "v0.2.4'
-#  echo 'foo "v0.2.4'
-#  echo 'foo "v0.2.5'
-#  echo 'foo "v0.2.5'
-#  echo 'foo "v0.2.6'
-#  echo 'foo "v0.2.6'
-#  echo 'foo "v0.3.0'
-#  echo 'foo "v0.3.0'
-#  echo 'foo "v0.3.1'
-#  echo 'foo "v0.3.1'
-#  echo 'foo "v0.3.2'
-#  echo 'foo "v0.3.2'
-#  echo 'foo "v0.3.3'
-#  echo 'foo "v0.3.3'
-#  echo 'foo "v0.3.4'
-#  echo 'foo "v0.3.4'
-#  echo 'foo "v0.3.5'
-#  echo 'foo "v0.3.5'
-#  echo 'foo "v0.3.6'
-#  echo 'foo "v0.3.6'
-#  echo 'foo "v0.3.7'
-#  echo 'foo "v0.3.7'
-#  echo 'foo "v0.3.8'
-#  echo 'foo "v0.3.8'
-#  echo 'foo "v0.4.0'
-#  echo 'foo "v0.4.0'
-#  echo 'foo "v0.4.1'
-#  echo 'foo "v0.4.1'
-#  echo 'foo "v0.4.10'
-#  echo 'foo "v0.4.10'
-#  echo 'foo "v0.4.11'
-#  echo 'foo "v0.4.11'
-#  echo 'foo "v0.4.12'
-#  echo 'foo "v0.4.12'
-#  echo 'foo "v0.4.2'
-#  echo 'foo "v0.4.2'
-#  echo 'foo "v0.4.3'
-#  echo 'foo "v0.4.3'
-#  echo 'foo "v0.4.4'
-#  echo 'foo "v0.4.4'
-#  echo 'foo "v0.4.5'
-#  echo 'foo "v0.4.5'
-#  echo 'foo "v0.4.6'
-#  echo 'foo "v0.4.6'
-#  echo 'foo "v0.4.7'
-#  echo 'foo "v0.4.7'
-#  echo 'foo "v0.4.8'
-#  echo 'foo "v0.4.8'
-#  echo 'foo "v0.4.9'
-#  echo 'foo "v0.4.9'
-#  echo 'foo "v0.5.0'
-#  echo 'foo "v0.5.0'
-#  echo 'foo "v0.6.1'
-#  echo 'foo "v0.6.1'
-#  echo 'foo "v0.6.10'
-#  echo 'foo "v0.6.10'
-#  echo 'foo "v0.6.11'
-#  echo 'foo "v0.6.11'
-#  echo 'foo "v0.6.12'
-#  echo 'foo "v0.6.12'
-#  echo 'foo "v0.6.13'
-#  echo 'foo "v0.6.13'
-#  echo 'foo "v0.6.2'
-#  echo 'foo "v0.6.2'
-#  echo 'foo "v0.6.3'
-#  echo 'foo "v0.6.3'
-#  echo 'foo "v0.6.4'
-#  echo 'foo "v0.6.4'
-#  echo 'foo "v0.6.5'
-#  echo 'foo "v0.6.5'
-#  echo 'foo "v0.6.6'
-#  echo 'foo "v0.6.6'
-#  echo 'foo "v0.6.7'
-#  echo 'foo "v0.6.7'
-#  echo 'foo "v0.6.8'
-#  echo 'foo "v0.6.8'
-#  echo 'foo "v0.6.9'
-#  echo 'foo "v0.6.9'
-#}
-#
-#OUTPUT="$(nvm_ls_remote foo)"
-#EXIT_CODE="$(nvm_ls_remote foo >/dev/null 2>&1 ; echo $?)"
-#[ "_$OUTPUT" = "_N/A" ] || die "nonexistent version did not report N/A"
-#[ "_$EXIT_CODE" = "_3" ] || die "nonexistent version did not exit with code 3, got $EXIT_CODE"
-#
-#OUTPUT="$(nvm_ls_remote)"
-#EXPECTED_OUTPUT="$(nvm_download | \egrep -o 'v[0-9]+\.[0-9]+\.[0-9]+' | sort -t. -u -k 1.2,1n -k 2,2n -k 3,3n)"
-#[ "_$OUTPUT" = "_$EXPECTED_OUTPUT" ] || die "bare nvm_ls_remote did not output expected sorted versions; got $(echo "$OUTPUT") expected $(echo "$EXPECTED_OUTPUT")"
-#
-#OUTPUT="$(nvm_ls_remote 0.3)"
-#EXPECTED_OUTPUT="v0.3.0
-#v0.3.1
-#v0.3.2
-#v0.3.3
-#v0.3.4
-#v0.3.5
-#v0.3.6
-#v0.3.7
-#v0.3.8"
-#
-#[ "_$OUTPUT" = "_$EXPECTED_OUTPUT" ] || die "nvm_ls_remote 0.3 did not output 0.3.x versions; got $OUTPUT"
-#
-## Sanity checks
-#OUTPUT="$(nvm_print_implicit_alias remote stable)"
-#EXPECTED_OUTPUT="0.10"
-#[ "_$OUTPUT" = "_$EXPECTED_OUTPUT" ] || die "nvm_print_implicit_alias remote stable did not output $EXPECTED_OUTPUT; got $OUTPUT"
-#
-#OUTPUT="$(nvm_print_implicit_alias remote unstable)"
-#EXPECTED_OUTPUT="0.11"
-#[ "_$OUTPUT" = "_$EXPECTED_OUTPUT" ] || die "nvm_print_implicit_alias remote unstable did not output $EXPECTED_OUTPUT; got $OUTPUT"
-#
-#OUTPUT="$(nvm_ls_remote stable)"
-#EXPECTED_OUTPUT="v0.10.32"
-#[ "_$OUTPUT" = "_$EXPECTED_OUTPUT" ] || die "nvm_ls_remote stable did not output $EXPECTED_OUTPUT; got $OUTPUT"
-#
-#OUTPUT="$(nvm_ls_remote unstable)"
-#EXPECTED_OUTPUT="v0.11.14"
-#[ "_$OUTPUT" = "_$EXPECTED_OUTPUT" ] || die "nvm_ls_remote unstable did not output $EXPECTED_OUTPUT; got $OUTPUT"
-#
-#cleanup
-#
+    test_implementing && skip
+
+    nvm_download() {
+        cat ${FIXTURES_DIR}/download.txt
+    }
+
+    run nvm_ls_remote foo
+    assert_equal 3 "$status"
+    assert_match "N/A" "$output" "nonexistent version should report N/A"
+
+    run nvm_ls_remote
+    assert_equal 0 "$status"
+    assert_line 0 "v0.1.14" 
+    assert_line 45 "v0.3.3" 
+    assert_line 199 "v0.11.14"
+
+    run nvm_ls_remote 0.3
+    assert_equal 0 "$status"
+    assert_line 0 "v0.3.0"
+    assert_line 1 "v0.3.1"
+    assert_line 2 "v0.3.2"
+    assert_line 3 "v0.3.3"
+    assert_line 4 "v0.3.4"
+    assert_line 5 "v0.3.5"
+    assert_line 6 "v0.3.6"
+    assert_line 7 "v0.3.7"
+    assert_line 8 "v0.3.8"
+
+    run nvm_print_implicit_alias remote stable
+    assert_match "$output" "0.10"
+
+    run nvm_print_implicit_alias remote unstable
+    assert_match "$output" "0.11"
+
+    run nvm_ls_remote stable
+    assert_match "$output" "0.10.32"
+
+    run nvm_ls_remote unstable
+    assert_match "$output" "0.11.14"
 }
 
+
 @test './Unit tests/nvm_num_version_groups' {
-##!/bin/sh
-#
-#die () { echo $@ ; exit 1; }
-#
-#. ../../../nvm.sh
-#
-#[ "~$(nvm_num_version_groups)" = "~0" ] || die "no args should give 0"
-#[ "~$(nvm_num_version_groups a)" = "~1" ] || die "one letter should give 1"
-#
-#[ "~$(nvm_num_version_groups 1)" = "~1" ] || die "1 should give 1"
-#[ "~$(nvm_num_version_groups v1)" = "~1" ] || die "v1 should give 1"
-#[ "~$(nvm_num_version_groups v1.)" = "~1" ] || die "v1. should give 1"
-#
-#[ "~$(nvm_num_version_groups 1.2)" = "~2" ] || die "1.2 should give 2"
-#[ "~$(nvm_num_version_groups v1.2)" = "~2" ] || die "v1.2 should give 2"
-#[ "~$(nvm_num_version_groups v1.2.)" = "~2" ] || die "v1.2. should give 2"
-#
-#[ "~$(nvm_num_version_groups 1.2.3)" = "~3" ] || die "1.2.3 should give 3"
-#[ "~$(nvm_num_version_groups v1.2.3)" = "~3" ] || die "v1.2.3 should give 3"
-#[ "~$(nvm_num_version_groups v1.2.3.)" = "~3" ] || die "v1.2.3. should give 3"
-#
+    test_implementing && skip
+    
+    assert_equal "0" "$(nvm_num_version_groups)"
+
+    assert_equal "1" "$(nvm_num_version_groups a)"
+    
+    assert_equal "1" "$(nvm_num_version_groups 1)"   "1 should give 1"
+    assert_equal "1" "$(nvm_num_version_groups v1)"  "v1 should give 1"
+    assert_equal "1" "$(nvm_num_version_groups v1.)" "v1. should give 1"
+
+    assert_equal "2" "$(nvm_num_version_groups 1.2)"   "1.2 should give 2"
+    assert_equal "2" "$(nvm_num_version_groups v1.2)"  "v1.2 should give 2"
+    assert_equal "2" "$(nvm_num_version_groups v1.2.)" "v1.2. should give 2"
+
+    assert_equal "3" "$(nvm_num_version_groups 1.2.3)"   "1.2.3 should give 3"
+    assert_equal "3" "$(nvm_num_version_groups v1.2.3)"  "v1.2.3 should give 3"
+    assert_equal "3" "$(nvm_num_version_groups v1.2.3.)" "v1.2.3. should give 3"
 }
 
 @test './Unit tests/nvm_prepend_path' {
-##!/bin/sh
-#
-#die () { echo $@ ; exit 1; }
-#
-#. ../../../nvm.sh
-#
-#TEST_PATH=/usr/bin:/usr/local/bin
-#
-#NEW_PATH=`nvm_prepend_path "$TEST_PATH" "$NVM_DIR/v0.2.5/bin"`
-#
-#[ "$NEW_PATH" = "$NVM_DIR/v0.2.5/bin:/usr/bin:/usr/local/bin" ] || die "Not correctly prepended: $NEW_PATH "
-#
-#
-#EMPTY_PATH=
-#
-#NEW_PATH=`nvm_prepend_path "$EMPTY_PATH" "$NVM_DIR/v0.2.5/bin"`
-#
-#[ "$NEW_PATH" = "$NVM_DIR/v0.2.5/bin" ] || die "Not correctly prepended: $NEW_PATH "
+    test_implementing && skip
+
+    TEST_PATH=/usr/bin:/usr/local/bin
+    NEW_PATH=`nvm_prepend_path "$TEST_PATH" "$NVM_DIR/v0.2.5/bin"`
+
+    assert_equal "$NVM_DIR/v0.2.5/bin:/usr/bin:/usr/local/bin" "$NEW_PATH" "Not correctly prepended: $NEW_PATH "
+
+    EMPTY_PATH=
+    NEW_PATH=`nvm_prepend_path "$EMPTY_PATH" "$NVM_DIR/v0.2.5/bin"`
+
+    assert_equal "$NVM_DIR/v0.2.5/bin" "$NEW_PATH" "Not correctly prepended: $NEW_PATH "
 }
 
 @test './Unit tests/nvm_print_implicit_alias errors' {
-##!/bin/sh
-#
-#die () { echo $@ ; exit 1; }
-#
-#. ../../../nvm.sh
-#
-#EXPECTED_FIRST_MSG="nvm_print_implicit_alias must be specified with local or remote as the first argument."
-#[ "_$(nvm_print_implicit_alias 2>&1)" = "_$EXPECTED_FIRST_MSG" ] \
-#  || die "nvm_print_implicit_alias did not require local|remote as first argument"
-#[ "_$(nvm_print_implicit_alias foo 2>&1)" = "_$EXPECTED_FIRST_MSG" ] \
-#  || die "nvm_print_implicit_alias did not require local|remote as first argument"
-#
-#FIRST_EXIT_CODE="$(nvm_print_implicit_alias > /dev/null 2>&1 ; echo $?)"
-#[ "_$FIRST_EXIT_CODE" = "_1" ] \
-#  || die "nvm_print_implicit_alias without local|remote had wrong exit code: expected 1, got $FIRST_EXIT_CODE"
-#
-#EXPECTED_SECOND_MSG="Only implicit aliases 'stable' and 'unstable' are supported."
-#[ "_$(nvm_print_implicit_alias local 2>&1)" = "_$EXPECTED_SECOND_MSG" ] \
-#  || die "nvm_print_implicit_alias did not require stable|unstable as second argument"
-#[ "_$(nvm_print_implicit_alias local foo 2>&1)" = "_$EXPECTED_SECOND_MSG" ] \
-#  || die "nvm_print_implicit_alias did not require stable|unstable as second argument"
-#
-#SECOND_EXIT_CODE="$(nvm_print_implicit_alias local > /dev/null 2>&1 ; echo $?)"
-#[ "_$SECOND_EXIT_CODE" = "_2" ] \
-#  || die "nvm_print_implicit_alias without stable|unstable had wrong exit code: expected 2, got $SECOND_EXIT_CODE"
-#
+    test_implementing && skip
+
+    run nvm_print_implicit_alias
+    assert_match "$output" "nvm_print_implicit_alias must be specified with local or remote as the first argument." "nvm_print_implicit_alias did not require local|remote as first argument"
+
+    run nvm_print_implicit_alias foo
+    assert_match "$output" "nvm_print_implicit_alias must be specified with local or remote as the first argument." "nvm_print_implicit_alias did not require local|remote as first argument"
+    assert_equal "1" "$status"
+
+    run nvm_print_implicit_alias local
+    assert_match "$output" "Only implicit aliases 'stable' and 'unstable' are supported." "nvm_print_implicit_alias did not require stable|unstable as second argument"
+
+    run nvm_print_implicit_alias local foo
+    assert_match "$output" "Only implicit aliases 'stable' and 'unstable' are supported." "nvm_print_implicit_alias did not require stable|unstable as second argument"
+    assert_equal "2" "$status"
 }
 
 @test './Unit tests/nvm_print_implicit_alias success' {
-##!/bin/sh
-#
-#die () { echo $@ ; cleanup ; exit 1; }
-#cleanup() {
-#  rm -rf ../../../v0.2.3
-#  rm -rf ../../../v0.3.4
-#  rm -rf ../../../v0.4.6
-#  rm -rf ../../../v0.5.7
-#  rm -rf ../../../v0.7.7
-#  unset -f nvm_ls_remote
-#}
-#
-#. ../../../nvm.sh
-#
-#mkdir ../../../v0.2.3
-#mkdir ../../../v0.3.4
-#mkdir ../../../v0.4.6
-#mkdir ../../../v0.5.7
-#mkdir ../../../v0.7.7
-#
-#LATEST_STABLE="$(nvm_print_implicit_alias local stable)"
-#[ "_$LATEST_STABLE" = "_0.4" ] || die "local stable is not latest even minor: expected 0.4, got $LATEST_STABLE"
-#
-#LATEST_UNSTABLE="$(nvm_print_implicit_alias local unstable)"
-#[ "_$LATEST_UNSTABLE" = "_0.7" ] || die "local unstable is not latest odd minor: expected 0.7, got $LATEST_UNSTABLE"
-#
-#nvm_ls_remote() {
-#  echo "v0.4.3"
-#  echo "v0.5.4"
-#  echo "v0.6.6"
-#  echo "v0.7.7"
-#  echo "v0.9.7"
-#  echo "v0.4.3"
-#  echo "v0.5.4"
-#  echo "v0.6.6"
-#  echo "v0.7.7"
-#  echo "v0.9.7"
-#}
-#
-#LATEST_STABLE="$(nvm_print_implicit_alias remote stable)"
-#[ "_$LATEST_STABLE" = "_0.6" ] || die "remote stable is not latest even minor: expected 0.6, got $LATEST_STABLE"
-#
-#LATEST_UNSTABLE="$(nvm_print_implicit_alias remote unstable)"
-#[ "_$LATEST_UNSTABLE" = "_0.9" ] || die "remote unstable is not latest odd minor: expected 0.9, got $LATEST_UNSTABLE"
-#
-#cleanup
-#
+    test_implementing && skip
+
+    mkdir -p v0.2.3 v0.3.4 v0.4.6 v0.5.7 v0.7.7
+    
+    run nvm_print_implicit_alias local stable
+    assert_match "$output" "0.4"
+
+    run nvm_print_implicit_alias local unstable
+    assert_match "$output" "0.7"
+
+    nvm_ls_remote() {
+        echo "v0.4.3"
+        echo "v0.5.4"
+        echo "v0.6.6"
+        echo "v0.7.7"
+        echo "v0.9.7"
+        echo "v0.4.3"
+        echo "v0.5.4"
+        echo "v0.6.6"
+        echo "v0.7.7"
+        echo "v0.9.7"
+    }
+
+    run nvm_print_implicit_alias remote stable
+    assert_match "$output" "0.6"
+
+    run nvm_print_implicit_alias remote unstable
+    assert_match "$output" "0.9"
 }
 
 @test './Unit tests/nvm_remote_version' {
-##!/bin/sh
-#
-#die () { echo $@ ; cleanup ; exit 1; }
-#
-#cleanup() {
-#  unset -f nvm_ls_remote
-#}
-#
-#. ../../../nvm.sh
-#
-#nvm_ls_remote() {
-#  echo "N/A"
-#}
-#
-#OUTPUT="$(nvm_remote_version foo)"
-#EXIT_CODE="$(nvm_remote_version foo >/dev/null 2>&1 ; echo $?)"
-#
-#[ "_$OUTPUT" = "_N/A" ] || die "nonexistent version did not report N/A"
-#[ "_$EXIT_CODE" = "_3" ] || die "nonexistent version did not exit with code 3, got $EXIT_CODE"
-#
-#nvm_ls_remote() {
-#  echo "test output"
-#  echo "more test output"
-#  echo "pattern received: _$1_"
-#}
-#
-#OUTPUT="$(nvm_remote_version foo)"
-#EXIT_CODE="$(nvm_remote_version foo >/dev/null 2>&1 ; echo $?)"
-#
-#[ "_$OUTPUT" = "_pattern received: _foo_" ] \
-#  || die "nvm_remote_version foo did not return last line only of nvm_ls_remote foo; got $OUTPUT"
-#[ "_$EXIT_CODE" = "_0" ] || die "nvm_remote_version foo did not exit with 0, got $EXIT_CODE"
-#
-#cleanup
-#
+    test_implementing && skip
+
+    nvm_ls_remote() {
+        echo "N/A"
+    }
+
+    run nvm_remote_version foo
+    assert_match "$output" "N/A"
+    assert_equal "3" "$status"
+
+    nvm_ls_remote() {
+        echo "test output"
+        echo "more test output"
+        echo "pattern received: _$1_"
+    }
+
+    run nvm_remote_version foo
+    assert_match "$output" "pattern received: _foo_"  "nvm_remote_version foo did not return last line only of nvm_ls_remote foo; got $OUTPUT"
+    assert_equal "0" "$status"
 }
 
 @test './Unit tests/nvm_strip_path' {
-##!/bin/sh
-#
-#die () { echo $@ ; exit 1; }
-#
-#. ../../../nvm.sh
-#
-#TEST_PATH=$NVM_DIR/v0.10.5/bin:/usr/bin:$NVM_DIR/v0.11.5/bin:$NVM_DIR/v0.9.5/bin:/usr/local/bin:$NVM_DIR/v0.2.5/bin
-#
-#STRIPPED_PATH=`nvm_strip_path "$TEST_PATH" "/bin"`
-#
-#[ "$STRIPPED_PATH" = "/usr/bin:/usr/local/bin" ] || die "Not correctly stripped: $STRIPPED_PATH "
+    test_implementing && skip
+
+    TEST_PATH=$NVM_DIR/v0.10.5/bin:/usr/bin:$NVM_DIR/v0.11.5/bin:$NVM_DIR/v0.9.5/bin:/usr/local/bin:$NVM_DIR/v0.2.5/bin
+
+    STRIPPED_PATH=`nvm_strip_path "$TEST_PATH" "/bin"`
+
+    assert_equal "/usr/bin:/usr/local/bin" "$STRIPPED_PATH" "Not correctly stripped: $STRIPPED_PATH "
+    
 }
 
 @test './Unit tests/nvm_tree_contains_path' {
-##!/bin/sh
-#
-#cleanup () {
-#  rm tmp/node
-#  rmdir tmp
-#  rm tmp2/node
-#  rmdir tmp2
-#}
-#die () { echo $@ ; cleanup; exit 1; }
-#
-#. ../../../nvm.sh
-#
-#mkdir -p tmp
-#touch tmp/node
-#mkdir -p tmp2
-#touch tmp2/node
-#
-#[ "$(nvm_tree_contains_path 2>&1)" = "both the tree and the node path are required" ] || die 'incorrect error message with no args'
-#[ "$(nvm_tree_contains_path > /dev/null 2>&1 ; echo $?)" = "2" ] || die 'incorrect error code with no args'
-#[ "$(nvm_tree_contains_path tmp 2>&1)" = "both the tree and the node path are required" ] || die 'incorrect error message with one arg'
-#[ "$(nvm_tree_contains_path > /dev/null 2>&1 ; echo $?)" = "2" ] || die 'incorrect error code with one arg'
-#
-#nvm_tree_contains_path tmp tmp/node || die '"tmp" should contain "tmp/node"'
-#
-#nvm_tree_contains_path tmp tmp2/node && die '"tmp" should not contain "tmp2/node"'
-#
-#nvm_tree_contains_path tmp2 tmp2/node || die '"tmp2" should contain "tmp2/node"'
-#
-#nvm_tree_contains_path tmp2 tmp/node && die '"tmp2" should not contain "tmp/node"'
-#
-#cleanup
-#
+    test_implementing && skip
+
+    mkdir -p tmp tmp2
+    touch tmp/node tmp2/node
+
+    run nvm_tree_contains_path
+    assert_equal "2" "$status"
+    assert_match "$output" "both the tree and the node path are required" "expected error messge with no args"
+
+    nvm_tree_contains_path   tmp  tmp/node
+    ! nvm_tree_contains_path tmp  tmp2/node
+    ! nvm_tree_contains_path tmp2 tmp/node
+    nvm_tree_contains_path   tmp2 tmp2/node    
 }
 
 @test './Unit tests/nvm_validate_implicit_alias' {
-##!/bin/sh
-#
-#die () { echo $@ ; exit 1; }
-#
-#. ../../../nvm.sh
-#
-#EXPECTED_MSG="Only implicit aliases 'stable' and 'unstable' are supported."
-#[ "_$(nvm_validate_implicit_alias 2>&1)" = "_$EXPECTED_MSG" ] \
-#  || die "nvm_validate_implicit_alias did not require stable|unstable"
-#[ "_$(nvm_validate_implicit_alias foo 2>&1)" = "_$EXPECTED_MSG" ] \
-#  || die "nvm_validate_implicit_alias did not require stable|unstable"
-#
-#EXIT_CODE="$(nvm_validate_implicit_alias >/dev/null 2>&1 ; echo $?)"
-#[ "_$EXIT_CODE" = "_1" ] \
-#  || die "nvm_validate_implicit_alias without stable|unstable had wrong exit code: expected 1, got $EXIT_CODE"
-#
-#nvm_validate_implicit_alias stable || die "nvm_validate_implicit_alias stable did not exit 0"
-#nvm_validate_implicit_alias unstable || die "nvm_validate_implicit_alias unstable did not exit 0"
-#
+    test_implementing && skip
+
+    run nvm_validate_implicit_alias
+    assert_match "$output" "Only implicit aliases 'stable' and 'unstable' are supported." "nvm_validate_implicit_alias did not require stable|unstable"
+    run nvm_validate_implicit_alias foo
+    assert_match "$output" "Only implicit aliases 'stable' and 'unstable' are supported." "nvm_validate_implicit_alias did not require stable|unstable"
+    assert_equal "1" "$status"
+
+    nvm_validate_implicit_alias stable
+    nvm_validate_implicit_alias unstable
 }
 
 @test './Unit tests/nvm_version_dir' {
-##!/bin/sh
-#
-#die () { echo $@ ; exit 1; }
-#
-#. ../../../nvm.sh
-#
-#[ "$(nvm_version_dir)" = "$NVM_DIR/versions" ] || die '"nvm_version_dir" did not return new dir path'
-#[ "$(nvm_version_dir new)" = "$(nvm_version_dir)" ] || die '"nvm_version_dir new" did not return new dir path'
-#[ "$(nvm_version_dir old)" = "$NVM_DIR" ] || die '"nvm_version_dir old" did not return old dir path'
-#[ "$(nvm_version_dir foo 2>&1)" = "unknown version dir" ] || die '"nvm_version_dir foo" did not error out'
-#
+#    test_implementing && skip
+
+    run nvm_version_dir
+    assert_equal "$NVM_DIR/versions" "$output"
+
+    run nvm_version_dir new
+    assert_equal "$NVM_DIR/versions" "$output"
+
+    run nvm_version_dir old
+    assert_equal "$NVM_DIR" "$output"
+    
+    run nvm_version_dir foo
+    assert_match "$output" "unknown version dir"
+    assert_unequal "0" "$status"
 }
 
 @test './Unit tests/nvm_version_greater' {
-##!/bin/sh
-#
-#die () { echo $@ ; exit 1; }
-#
-#. ../../../nvm.sh
-#
-#nvm_version_greater 0.10.0 0.2.12 || die '"nvm_version_greater 0.10.0 0.2.12" did not return true'
-#
-#if nvm_version_greater 0.10.0 0.20.12; then
-#  die '"nvm_version_greater 0.10.0 0.20.12" returned true'
-#fi
-#
-#if nvm_version_greater 0.10.0 0.10.0; then
-#  die '"nvm_version_greater" returned false for the same two versions'
-#fi
-#
+#    test_implementing && skip
+
+    nvm_version_greater 0.10.0 0.2.12
+
+    ! nvm_version_greater 0.10.0 0.20.12
+
+    ! nvm_version_greater 0.10.0 0.10.0 
 }
 
 @test './Unit tests/nvm_version_path' {
-##!/bin/sh
-#
-#die () { echo $@ ; exit 1; }
-#
-#. ../../../nvm.sh
-#
-#[ "$(nvm_version_path foo)" = "$NVM_DIR/foo" ] || die '"nvm_version_path foo" did not return correct location'
-#[ "$(nvm_version_path 2>&1)" = "version is required" ] || die '"nvm_version_path" did not error out'
-#[ "$(nvm_version_path v0.11.0)" = "$NVM_DIR/v0.11.0" ] || die 'old version has the wrong path'
-#[ "$(nvm_version_path v0.12.0)" = "$NVM_DIR/versions/v0.12.0" ] || die 'new version has the wrong path'
-#
+#    test_implementing && skip
+
+    run nvm_version_path foo
+    assert_match "$output" "$NVM_DIR/foo"
+    
+    run nvm_version_path
+    assert_unequal "0" "$status"
+
+    run nvm_version_path v0.11.0
+    assert_match "$output" "$NVM_DIR/v0.11.0"
+
+    run nvm_version_path v0.12.0
+    assert_match "$output" "$NVM_DIR/versions/v0.12.0"
 }
 
diff --git a/test/fixtures/download.txt b/test/fixtures/download.txt
new file mode 100644
index 0000000..58535a2
--- /dev/null
+++ b/test/fixtures/download.txt
@@ -0,0 +1,430 @@
+foo "v0.10.0
+foo "v0.10.0
+foo "v0.10.1
+foo "v0.10.1
+foo "v0.10.10
+foo "v0.10.10
+foo "v0.10.11
+foo "v0.10.11
+foo "v0.10.12
+foo "v0.10.12
+foo "v0.10.13
+foo "v0.10.13
+foo "v0.10.14
+foo "v0.10.14
+foo "v0.10.15
+foo "v0.10.15
+foo "v0.10.16
+foo "v0.10.16
+foo "v0.10.16
+foo "v0.10.16
+foo "v0.10.17
+foo "v0.10.17
+foo "v0.10.18
+foo "v0.10.18
+foo "v0.10.19
+foo "v0.10.19
+foo "v0.10.2
+foo "v0.10.2
+foo "v0.10.20
+foo "v0.10.20
+foo "v0.10.21
+foo "v0.10.21
+foo "v0.10.22
+foo "v0.10.22
+foo "v0.10.23
+foo "v0.10.23
+foo "v0.10.24
+foo "v0.10.24
+foo "v0.10.25
+foo "v0.10.25
+foo "v0.10.26
+foo "v0.10.26
+foo "v0.10.27
+foo "v0.10.27
+foo "v0.10.28
+foo "v0.10.28
+foo "v0.10.29
+foo "v0.10.29
+foo "v0.10.3
+foo "v0.10.3
+foo "v0.10.30
+foo "v0.10.30
+foo "v0.10.31
+foo "v0.10.31
+foo "v0.10.32
+foo "v0.10.32
+foo "v0.10.4
+foo "v0.10.4
+foo "v0.10.5
+foo "v0.10.5
+foo "v0.10.6
+foo "v0.10.6
+foo "v0.10.7
+foo "v0.10.7
+foo "v0.10.8
+foo "v0.10.8
+foo "v0.10.9
+foo "v0.10.9
+foo "v0.11.0
+foo "v0.11.0
+foo "v0.11.1
+foo "v0.11.1
+foo "v0.11.10
+foo "v0.11.10
+foo "v0.11.11
+foo "v0.11.11
+foo "v0.11.12
+foo "v0.11.12
+foo "v0.11.13
+foo "v0.11.13
+foo "v0.11.14
+foo "v0.11.14
+foo "v0.11.2
+foo "v0.11.2
+foo "v0.11.3
+foo "v0.11.3
+foo "v0.11.4
+foo "v0.11.4
+foo "v0.11.5
+foo "v0.11.5
+foo "v0.11.6
+foo "v0.11.6
+foo "v0.11.7
+foo "v0.11.7
+foo "v0.11.8
+foo "v0.11.8
+foo "v0.11.9
+foo "v0.11.9
+foo "v0.5.1
+foo "v0.5.1
+foo "v0.5.10
+foo "v0.5.10
+foo "v0.5.2
+foo "v0.5.2
+foo "v0.5.3
+foo "v0.5.3
+foo "v0.5.4
+foo "v0.5.4
+foo "v0.5.5
+foo "v0.5.5
+foo "v0.5.6
+foo "v0.5.6
+foo "v0.5.7
+foo "v0.5.7
+foo "v0.5.8
+foo "v0.5.8
+foo "v0.5.9
+foo "v0.5.9
+foo "v0.6.0
+foo "v0.6.0
+foo "v0.6.1
+foo "v0.6.1
+foo "v0.6.10
+foo "v0.6.10
+foo "v0.6.11
+foo "v0.6.11
+foo "v0.6.12
+foo "v0.6.12
+foo "v0.6.13
+foo "v0.6.13
+foo "v0.6.14
+foo "v0.6.14
+foo "v0.6.15
+foo "v0.6.15
+foo "v0.6.16
+foo "v0.6.16
+foo "v0.6.17
+foo "v0.6.17
+foo "v0.6.18
+foo "v0.6.18
+foo "v0.6.19
+foo "v0.6.19
+foo "v0.6.2
+foo "v0.6.2
+foo "v0.6.20
+foo "v0.6.20
+foo "v0.6.21
+foo "v0.6.21
+foo "v0.6.3
+foo "v0.6.3
+foo "v0.6.4
+foo "v0.6.4
+foo "v0.6.5
+foo "v0.6.5
+foo "v0.6.6
+foo "v0.6.6
+foo "v0.6.7
+foo "v0.6.7
+foo "v0.6.8
+foo "v0.6.8
+foo "v0.6.9
+foo "v0.6.9
+foo "v0.7.0
+foo "v0.7.0
+foo "v0.7.1
+foo "v0.7.1
+foo "v0.7.10
+foo "v0.7.10
+foo "v0.7.11
+foo "v0.7.11
+foo "v0.7.12
+foo "v0.7.12
+foo "v0.7.2
+foo "v0.7.2
+foo "v0.7.3
+foo "v0.7.3
+foo "v0.7.4
+foo "v0.7.4
+foo "v0.7.5
+foo "v0.7.5
+foo "v0.7.6
+foo "v0.7.6
+foo "v0.7.7
+foo "v0.7.7
+foo "v0.7.8
+foo "v0.7.8
+foo "v0.7.9
+foo "v0.7.9
+foo "v0.8.0
+foo "v0.8.0
+foo "v0.8.1
+foo "v0.8.1
+foo "v0.8.10
+foo "v0.8.10
+foo "v0.8.11
+foo "v0.8.11
+foo "v0.8.12
+foo "v0.8.12
+foo "v0.8.13
+foo "v0.8.13
+foo "v0.8.14
+foo "v0.8.14
+foo "v0.8.15
+foo "v0.8.15
+foo "v0.8.16
+foo "v0.8.16
+foo "v0.8.17
+foo "v0.8.17
+foo "v0.8.18
+foo "v0.8.18
+foo "v0.8.19
+foo "v0.8.19
+foo "v0.8.2
+foo "v0.8.2
+foo "v0.8.20
+foo "v0.8.20
+foo "v0.8.21
+foo "v0.8.21
+foo "v0.8.22
+foo "v0.8.22
+foo "v0.8.23
+foo "v0.8.23
+foo "v0.8.24
+foo "v0.8.24
+foo "v0.8.25
+foo "v0.8.25
+foo "v0.8.26
+foo "v0.8.26
+foo "v0.8.27
+foo "v0.8.27
+foo "v0.8.28
+foo "v0.8.28
+foo "v0.8.3
+foo "v0.8.3
+foo "v0.8.4
+foo "v0.8.4
+foo "v0.8.5
+foo "v0.8.5
+foo "v0.8.6
+foo "v0.8.6
+foo "v0.8.7
+foo "v0.8.7
+foo "v0.8.8
+foo "v0.8.8
+foo "v0.8.9
+foo "v0.8.9
+foo "v0.9.0
+foo "v0.9.0
+foo "v0.9.1
+foo "v0.9.1
+foo "v0.9.10
+foo "v0.9.10
+foo "v0.9.11
+foo "v0.9.11
+foo "v0.9.12
+foo "v0.9.12
+foo "v0.9.2
+foo "v0.9.2
+foo "v0.9.3
+foo "v0.9.3
+foo "v0.9.4
+foo "v0.9.4
+foo "v0.9.5
+foo "v0.9.5
+foo "v0.9.6
+foo "v0.9.6
+foo "v0.9.7
+foo "v0.9.7
+foo "v0.9.8
+foo "v0.9.8
+foo "v0.9.9
+foo "v0.9.9
+foo "v0.1.100
+foo "v0.1.100
+foo "v0.1.101
+foo "v0.1.101
+foo "v0.1.102
+foo "v0.1.102
+foo "v0.1.103
+foo "v0.1.103
+foo "v0.1.104
+foo "v0.1.104
+foo "v0.1.14
+foo "v0.1.14
+foo "v0.1.15
+foo "v0.1.15
+foo "v0.1.16
+foo "v0.1.16
+foo "v0.1.17
+foo "v0.1.17
+foo "v0.1.18
+foo "v0.1.18
+foo "v0.1.19
+foo "v0.1.19
+foo "v0.1.20
+foo "v0.1.20
+foo "v0.1.21
+foo "v0.1.21
+foo "v0.1.22
+foo "v0.1.22
+foo "v0.1.23
+foo "v0.1.23
+foo "v0.1.24
+foo "v0.1.24
+foo "v0.1.25
+foo "v0.1.25
+foo "v0.1.26
+foo "v0.1.26
+foo "v0.1.27
+foo "v0.1.27
+foo "v0.1.28
+foo "v0.1.28
+foo "v0.1.29
+foo "v0.1.29
+foo "v0.1.30
+foo "v0.1.30
+foo "v0.1.31
+foo "v0.1.31
+foo "v0.1.32
+foo "v0.1.32
+foo "v0.1.33
+foo "v0.1.33
+foo "v0.1.90
+foo "v0.1.90
+foo "v0.1.91
+foo "v0.1.91
+foo "v0.1.92
+foo "v0.1.92
+foo "v0.1.93
+foo "v0.1.93
+foo "v0.1.94
+foo "v0.1.94
+foo "v0.1.95
+foo "v0.1.95
+foo "v0.1.96
+foo "v0.1.96
+foo "v0.1.97
+foo "v0.1.97
+foo "v0.1.98
+foo "v0.1.98
+foo "v0.1.99
+foo "v0.1.99
+foo "v0.10.14
+foo "v0.10.14
+foo "v0.2.0
+foo "v0.2.0
+foo "v0.2.1
+foo "v0.2.1
+foo "v0.2.2
+foo "v0.2.2
+foo "v0.2.3
+foo "v0.2.3
+foo "v0.2.4
+foo "v0.2.4
+foo "v0.2.5
+foo "v0.2.5
+foo "v0.2.6
+foo "v0.2.6
+foo "v0.3.0
+foo "v0.3.0
+foo "v0.3.1
+foo "v0.3.1
+foo "v0.3.2
+foo "v0.3.2
+foo "v0.3.3
+foo "v0.3.3
+foo "v0.3.4
+foo "v0.3.4
+foo "v0.3.5
+foo "v0.3.5
+foo "v0.3.6
+foo "v0.3.6
+foo "v0.3.7
+foo "v0.3.7
+foo "v0.3.8
+foo "v0.3.8
+foo "v0.4.0
+foo "v0.4.0
+foo "v0.4.1
+foo "v0.4.1
+foo "v0.4.10
+foo "v0.4.10
+foo "v0.4.11
+foo "v0.4.11
+foo "v0.4.12
+foo "v0.4.12
+foo "v0.4.2
+foo "v0.4.2
+foo "v0.4.3
+foo "v0.4.3
+foo "v0.4.4
+foo "v0.4.4
+foo "v0.4.5
+foo "v0.4.5
+foo "v0.4.6
+foo "v0.4.6
+foo "v0.4.7
+foo "v0.4.7
+foo "v0.4.8
+foo "v0.4.8
+foo "v0.4.9
+foo "v0.4.9
+foo "v0.5.0
+foo "v0.5.0
+foo "v0.6.1
+foo "v0.6.1
+foo "v0.6.10
+foo "v0.6.10
+foo "v0.6.11
+foo "v0.6.11
+foo "v0.6.12
+foo "v0.6.12
+foo "v0.6.13
+foo "v0.6.13
+foo "v0.6.2
+foo "v0.6.2
+foo "v0.6.3
+foo "v0.6.3
+foo "v0.6.4
+foo "v0.6.4
+foo "v0.6.5
+foo "v0.6.5
+foo "v0.6.6
+foo "v0.6.6
+foo "v0.6.7
+foo "v0.6.7
+foo "v0.6.8
+foo "v0.6.8
+foo "v0.6.9
+foo "v0.6.9