diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..0dda7bf
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,10 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[**/*.bats]
+indent_size = 4
+indent_style = space
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 852b572..aaf0a69 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,5 @@ npm-debug.log
 
 .DS_Store
 current
+
+*~
diff --git a/package.json b/package.json
index 18d203e..b38fb6d 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,8 @@
     "test/slow": "shell=$(basename -- $(ps -o comm= $(ps -o ppid= -p $PPID)) | sed 's/^-//'); make TEST_SUITE=slow test-$shell",
     "test/install_script": "shell=$(basename -- $(ps -o comm= $(ps -o ppid= -p $PPID)) | sed 's/^-//'); make TEST_SUITE=install_script test-$shell",
     "test/installation": "shell=$(basename -- $(ps -o comm= $(ps -o ppid= -p $PPID)) | sed 's/^-//'); make TEST_SUITE=installation test-$shell",
-    "test/sourcing": "shell=$(basename -- $(ps -o comm= $(ps -o ppid= -p $PPID)) | sed 's/^-//'); make TEST_SUITE=sourcing test-$shell"
+    "test/sourcing": "shell=$(basename -- $(ps -o comm= $(ps -o ppid= -p $PPID)) | sed 's/^-//'); make TEST_SUITE=sourcing test-$shell",
+    "bats": "bats test/bats"
   },
   "repository": {
     "type": "git",
@@ -30,6 +31,7 @@
   },
   "homepage": "https://github.com/creationix/nvm",
   "devDependencies": {
+    "bats": "git://github.com/sstephenson/bats",
     "replace": "~0.3.0",
     "semver": "~4.2.0",
     "urchin": "~0.0.5"
diff --git a/test/bats/aliases-circular.bats b/test/bats/aliases-circular.bats
new file mode 100644
index 0000000..e10fadc
--- /dev/null
+++ b/test/bats/aliases-circular.bats
@@ -0,0 +1,58 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+NVM_SRC_DIR="${BATS_TEST_DIRNAME}/../.."
+
+setup() {
+    echo 'setup' >&2
+    NVM_DIR="${BATS_TMPDIR}"
+    cd "${NVM_DIR}"
+    rm -Rf src alias v*
+    mkdir src alias
+
+    echo loopback > alias/loopback
+    echo two > alias/one
+    echo three > alias/two
+    echo one > alias/three
+
+    echo two > alias/four
+}
+
+teardown() {
+    echo 'teardown' >&2
+    NVM_DIR="${BATS_TMPDIR}"
+    cd "${NVM_DIR}"
+    rm -Rf src alias v*
+}
+
+@test './Aliases/circular/nvm_resolve_alias' {
+    load "${NVM_SRC_DIR}/nvm.sh"
+
+    die () { echo $@ ; exit 1; }
+
+    run nvm_resolve_alias loopback
+    assert_success "∞"
+    run nvm alias loopback
+    assert_success "loopback -> loopback (-> ∞)"
+
+    run nvm_resolve_alias one
+    assert_success "∞"
+    run nvm alias one
+    assert_success "one -> two (-> ∞)"
+
+    run nvm_resolve_alias two
+    assert_success "∞"
+    run nvm alias two
+    assert_success "two -> three (-> ∞)"
+
+    run nvm_resolve_alias three
+    assert_success "∞"
+    run nvm alias three
+    assert_success "three -> one (-> ∞)"
+
+    run nvm_resolve_alias four
+    assert_success "∞"
+    run nvm alias four
+    assert_success "four -> two (-> ∞)"
+}
diff --git a/test/bats/aliases-listall.bats b/test/bats/aliases-listall.bats
new file mode 100644
index 0000000..1104d72
--- /dev/null
+++ b/test/bats/aliases-listall.bats
@@ -0,0 +1,54 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+NVM_SRC_DIR="${BATS_TEST_DIRNAME}/../.."
+NVM_DIR="${BATS_TMPDIR}"
+load "${NVM_SRC_DIR}/nvm.sh"
+
+setup() {
+    echo 'setup' >&2
+    cd "${NVM_DIR}"
+    rm -Rf src alias v*
+    mkdir src alias
+    for i in 1 2 3 4 5 6 7 8 9 10
+    do
+        echo 0.0.$i > alias/test-stable-$i
+        mkdir -p v0.0.$i
+        echo 0.1.$i > alias/test-unstable-$i
+        mkdir -p v0.1.$i
+    done
+}
+
+teardown() {
+    echo 'teardown' >&2
+    cd "${NVM_DIR}"
+    rm -Rf src alias v*
+}
+
+@test './Aliases/Running "nvm alias" should list all aliases.' {
+    run nvm alias
+    
+    assert_line  0 'test-stable-1 -> 0.0.1 (-> v0.0.1)'      "did not find test-stable-1 alias"
+    assert_line  1 'test-stable-10 -> 0.0.10 (-> v0.0.10)'   "did not find test-stable-10 alias"
+    assert_line  2 'test-stable-2 -> 0.0.2 (-> v0.0.2)'      "did not find test-stable-2 alias"
+    assert_line  3 'test-stable-3 -> 0.0.3 (-> v0.0.3)'      "did not find test-stable-3 alias"
+    assert_line  4 'test-stable-4 -> 0.0.4 (-> v0.0.4)'      "did not find test-stable-4 alias"
+    assert_line  5 'test-stable-5 -> 0.0.5 (-> v0.0.5)'      "did not find test-stable-5 alias"
+    assert_line  6 'test-stable-6 -> 0.0.6 (-> v0.0.6)'      "did not find test-stable-6 alias"
+    assert_line  7 'test-stable-7 -> 0.0.7 (-> v0.0.7)'      "did not find test-stable-7 alias"
+    assert_line  8 'test-stable-8 -> 0.0.8 (-> v0.0.8)'      "did not find test-stable-8 alias"
+    assert_line  9 'test-stable-9 -> 0.0.9 (-> v0.0.9)'      "did not find test-stable-9 alias"
+    assert_line 10 'test-unstable-1 -> 0.1.1 (-> v0.1.1)'    "did not find test-unstable-1 alias"
+    assert_line 11 'test-unstable-10 -> 0.1.10 (-> v0.1.10)' "did not find test-unstable-10 alias"
+    assert_line 12 'test-unstable-2 -> 0.1.2 (-> v0.1.2)'    "did not find test-unstable-2 alias"
+    assert_line 13 'test-unstable-3 -> 0.1.3 (-> v0.1.3)'    "did not find test-unstable-3 alias"
+    assert_line 14 'test-unstable-4 -> 0.1.4 (-> v0.1.4)'    "did not find test-unstable-4 alias"
+    assert_line 15 'test-unstable-5 -> 0.1.5 (-> v0.1.5)'    "did not find test-unstable-5 alias"
+    assert_line 16 'test-unstable-6 -> 0.1.6 (-> v0.1.6)'    "did not find test-unstable-6 alias"
+    assert_line 17 'test-unstable-7 -> 0.1.7 (-> v0.1.7)'    "did not find test-unstable-7 alias"
+    assert_line 18 'test-unstable-8 -> 0.1.8 (-> v0.1.8)'    "did not find test-unstable-8 alias"
+    assert_line 19 'test-unstable-9 -> 0.1.9 (-> v0.1.9)'    "did not find test-unstable-9 alias"
+    
+}
+
diff --git a/test/bats/aliases.bats b/test/bats/aliases.bats
new file mode 100644
index 0000000..ca6c98a
--- /dev/null
+++ b/test/bats/aliases.bats
@@ -0,0 +1,85 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+NVM_SRC_DIR="${BATS_TEST_DIRNAME}/../.."
+NVM_DIR="${BATS_TMPDIR}"
+load "${NVM_SRC_DIR}/nvm.sh"
+
+setup() {
+    echo 'setup' >&2
+    cd "${NVM_DIR}"
+    rm -Rf src alias v*
+    mkdir src alias
+    for i in 1 2 3 4 5 6 7 8 9 10
+    do
+        echo 0.0.$i > alias/test-stable-$i
+        mkdir -p v0.0.$i
+        echo 0.1.$i > alias/test-unstable-$i
+        mkdir -p v0.1.$i
+    done
+}
+
+teardown() {
+    echo 'teardown' >&2
+    cd "${NVM_DIR}"
+    rm -Rf src alias v*
+}
+
+@test './Aliases/nvm_resolve_alias' {
+
+    run nvm_resolve_alias
+    [ "$status" -eq 1 ]
+
+    for i in $(seq 1 10)
+    do
+        run nvm_resolve_alias test-stable-$i
+        assert_success "v0.0.$i" "nvm_resolve_alias test-stable-$i"
+
+        run nvm_resolve_alias test-unstable-$i
+        assert_success "v0.1.$i" "nvm_resolve_alias test-unstable-$i"
+    done
+    
+    run nvm_resolve_alias nonexistent
+    assert_failure 
+
+    run nvm_resolve_alias stable
+    assert_success "v0.0.10"  "'nvm_resolve_alias stable' was not v0.0.10"
+
+    run nvm_resolve_alias unstable
+    assert_success "v0.1.10"  "'nvm_resolve_alias unstable' was not v0.1.10"
+}
+
+@test './Aliases/Running "nvm alias <aliasname>" should list but one alias.' {
+    run nvm alias test-stable-1
+    assert_success
+    
+    local num_lines="${#lines[@]}"
+    assert_equal $num_lines 2
+}
+
+@test './Aliases/Running "nvm alias" lists implicit aliases when they do not exist' {
+    run nvm alias
+
+    assert_line 20 "stable -> 0.0 (-> v0.0.10) (default)"  "nvm alias did not contain the default local stable node version"
+    assert_line 21 "unstable -> 0.1 (-> v0.1.10) (default)" "nvm alias did not contain the default local unstable node version"
+}
+
+@test './Aliases/Running "nvm alias" lists manual aliases instead of implicit aliases when present' {
+    mkdir v0.8.1
+    mkdir v0.9.1
+    
+    stable="$(nvm_print_implicit_alias local stable)"
+    unstable="$(nvm_print_implicit_alias local unstable)"
+   
+    assert_unequal $stable $unstable "stable and unstable versions are the same!"
+
+    run nvm alias stable $unstable
+    run nvm alias unstable $stable
+
+    run nvm alias
+
+    assert_line  0 "stable -> 0.9 (-> v0.9.1)"    "nvm alias did not contain the overridden 'stable' alias"
+    assert_line 21 "unstable -> 0.8 (-> v0.8.1)"  "nvm alias did not contain the overridden 'unstable' alias"
+}
+
diff --git a/test/bats/fast.bats b/test/bats/fast.bats
new file mode 100644
index 0000000..9185ea5
--- /dev/null
+++ b/test/bats/fast.bats
@@ -0,0 +1,222 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+NVM_SRC_DIR="${BATS_TEST_DIRNAME}/../.."
+source "${NVM_SRC_DIR}/nvm.sh"
+
+test_debug() {
+    false # set to 'true' to get setup/teardown in test stderr
+}
+
+test_implementing() {
+    false # set to 'false' to run all tests; set to 'true' to skip implemented tests
+    # only used while porting to bats: remove afterward
+}
+
+setup() {
+    test_debug && echo 'setup' >&2
+    NVM_DIR="${BATS_TMPDIR}"
+    cd "${NVM_DIR}"
+    rm -Rf src alias v*
+    mkdir src alias
+}
+
+teardown() {
+    test_debug && echo 'teardown' >&2
+    NVM_DIR="${BATS_TMPDIR}"
+    cd "${NVM_DIR}"
+    rm -Rf src alias v*
+}
+
+@test "'nvm' command defined in environment" {
+    test_implementing && skip
+    run nvm
+    assert_equal "$status" "0" "nvm command defined"
+}
+
+@test "Running 'nvm alias' should create a file in the alias directory." {
+    test_implementing && skip
+    run nvm alias test v0.1.2
+    [ "$status" -eq 0 ]
+    result=$(cat "alias/test")
+    assert_equal "$result" "v0.1.2" "expected new alias"
+}
+
+@test 'Running "nvm current" should display current nvm environment.' {
+    test_implementing && skip
+
+    run nvm deactivate
+
+    run nvm current
+    assert_match "$output" 'system|none' "expected 'none' or 'system' when deactivated"
+}
+
+@test 'Running "nvm deactivate" should unset the nvm environment variables.' {
+    test_implementing && skip
+
+    mkdir -p v0.2.3
+
+    # v0.2.3 should not be active
+    assert_nomatch "$PATH" ".*v0.2.3/.*/bin" "v0.2.3 should not be active yet"
+    [ `expr $PATH : ".*v0.2.3/.*/bin"` = 0 ]
+
+    # can't use 'run' -- sets up new env, PATH is lost
+    nvm use 0.2.3
+
+    assert_match $PATH "v0.2.3/.*/bin" "PATH should contain v0.2.3"
+    assert_nomatch $NODE_PATH "v0.2.3/lib/node_modules" "NODE_PATH should not contain v0.2.3"
+
+    nvm deactivate
+    
+    assert_nomatch $PATH "v0.2.3/.*/bin" "PATH should be cleaned of v0.2.3"
+    assert_nomatch $NODE_PATH "v0.2.3/lib/node_modules" "NODE_PATH should not contain v0.2.3"
+}
+
+@test 'Running "nvm install" with "--reinstall-packages-from" requires a valid version' {
+    test_implementing && skip
+
+    mkdir -p v0.10.4
+
+    nvm deactivate
+
+    run nvm install v0.10.5 --reinstall-packages-from=0.11
+    assert_equal 5 "$status" "should exit with code 5, invalid version"
+    assert_match "$output" "If --reinstall-packages-from is provided, it must point to an installed version of node."
+
+    run nvm install v0.10.5 --reinstall-packages-from=0.10.5
+    assert_equal 4 "$status" "should exit with code 4, same version"
+    assert_match "$output" "You can't reinstall global packages from the same version of node you're installing."
+
+}
+
+@test 'Running "nvm install" with an invalid version fails nicely' {
+    test_implementing && skip
+
+    run nvm install invalid.invalid
+    assert_equal "3" "$status" "Invalid version, exit with status 3"
+    assert_match "$output" "Version 'invalid.invalid' not found - try \`nvm ls-remote\` to browse available versions." "nvm installing an invalid version did not print a nice error message"
+}
+
+@test 'Running "nvm unalias" should remove the alias file.' {
+    test_implementing && skip
+
+    echo v0.1.2 > alias/test
+
+    run nvm unalias test
+    ! [ -e alias/test ]
+}
+
+@test 'Running "nvm uninstall" should remove the appropriate directory.' {
+    test_implementing && skip
+
+    mkdir -p v0.0.1 src/node-v0.0.1
+
+    nvm uninstall v0.0.1
+    ! [ -d 'v0.0.1' ]
+    ! [ -d 'src/node-v0.0.1' ]
+}
+
+@test 'Running "nvm unload" should unset all function and variables.' {
+    test_implementing && skip
+
+    run type nvm
+    assert_equal 0 "$status" "nvm not loaded"
+
+    nvm unload
+
+    run type nvm
+    assert_equal 1 "$status" "nvm should have unloaded"
+}
+
+@test 'Running "nvm use foo" where "foo" is circular aborts' {
+    test_implementing && skip
+
+    echo 'foo' > alias/foo
+
+    run nvm use foo
+    assert_equal 8 "$status" "Expected exit code 8 (infinite alias loop)"
+    assert_match "$output" 'The alias "foo" leads to an infinite loop. Aborting.'
+}
+
+@test 'Running "nvm use system" should work as expected' {
+    test_implementing && skip
+
+    # NOTE: undocumented assumption of this test is
+    # that node is installed on the test machine!
+    # TODO: fix that, by using a mock
+
+    nvm_has_system_node() { return 0; }
+    run nvm use system
+    assert_equal 0 "$status" "Expect success in using system node"
+    assert_match "$output" 'Now using system version of node:'
+
+    nvm_has_system_node() { return 1; }
+    run nvm use system
+    assert_equal 127 "$status" "Expect failure when no system node"
+    assert_match "$output" 'System version of node not found.'
+}
+
+@test 'Running "nvm use x" should create and change the "current" symlink' {
+    test_implementing && skip
+
+    export NVM_SYMLINK_CURRENT=true
+
+    mkdir -p v0.10.29
+    nvm use 0.10.29
+    rmdir v0.10.29
+
+    # TODO make this a proper assert
+    [ -L current ] # "expected 'current' symlink to be created"
+
+    oldLink="$(readlink current)"
+
+    assert_equal "$(basename $oldLink)" "v0.10.29" "Expected 'current' to point to v0.10.29 but was $oldLink"
+
+    mkdir v0.11.13
+    nvm use 0.11.13
+    rmdir v0.11.13
+
+    newlink="$(readlink current)"
+
+    assert_equal "$(basename $newlink)" "v0.11.13" "Expected 'current' to point to v0.11.13 but was $newLink"
+}
+
+@test 'Running "nvm use x" should not create the "current" symlink if $NVM_SYMLINK_CURRENT is false' {
+    test_implementing && skip
+
+    test_symlink_made() {
+        local arg="$1"
+
+        mkdir v0.10.29
+
+        if [ "$arg" = "undef" ]
+        then
+            unset NVM_SYMLINK_CURRENT
+        else 
+            NVM_SYMLINK_CURRENT="$arg"
+        fi
+
+        run nvm use 0.10.29
+        run [ -L current ]
+        result="$status"
+
+        rm -f current
+        rmdir v0.10.29
+
+        return $result
+    }
+
+    test_symlink_made 'true'
+
+    ! test_symlink_made 'false'
+    ! test_symlink_made 'garbagevalue'
+    ! test_symlink_made 0
+    ! test_symlink_made 1
+    ! test_symlink_made 'undef'
+}
+
+@test 'Sourcing nvm.sh should make the nvm command available.' {
+
+    nvm
+}
diff --git a/test/bats/listing-versions.bats b/test/bats/listing-versions.bats
new file mode 100644
index 0000000..f209df8
--- /dev/null
+++ b/test/bats/listing-versions.bats
@@ -0,0 +1,158 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+NVM_SRC_DIR="${BATS_TEST_DIRNAME}/../.."
+
+setup() {
+    NVM_DIR="${BATS_TMPDIR}"
+    cd "${NVM_DIR}"
+    rm -Rf src alias v*
+    mkdir src alias
+    load "${NVM_SRC_DIR}/nvm.sh"
+}
+
+teardown() {
+    NVM_DIR="${BATS_TMPDIR}"
+    cd "${NVM_DIR}"
+    rm -Rf src alias v*
+}
+
+@test 'Listing versions/Running "nvm ls 0.0.2" should display only version 0.0.2.' {
+
+    mkdir -p v0.0.2
+    mkdir -p v0.0.20
+
+    run nvm ls 0.0.2
+    assert_match ${lines[0]} "v0.0.2" "nvm ls 0.0.2 must contain v0.0.2"
+
+    run nvm ls 0.0.2
+    assert_nomatch "$output" "v0.0.20"  "nvm ls 0.0.2 must NOT contain v0.0.20"
+}
+
+@test 'Listing versions/Running "nvm ls 0.2" should display only 0.2.x versions.' {
+
+    mkdir -p v0.1.3
+    mkdir -p v0.2.3
+    mkdir -p v0.20.3
+
+    run nvm ls 0.1
+    assert_nomatch "$output" "v0.2.3"  "nvm ls 0.1 should not contain v0.2.3"
+    assert_nomatch "$output" "v0.20.3" "nvm ls 0.1 should not contain v0.20.3"    
+    assert_match   "$output" "v0.1.3"  "nvm ls 0.1 should contain v0.1.3"
+
+    run nvm ls 0.2
+    assert_match   "$output" "v0.2.3"  "nvm ls 0.2 should contain v0.2.3"
+    assert_nomatch "$output" "v0.20.3" "nvm ls 0.2 should not contain v0.20.3"    
+    assert_nomatch "$output" "v0.1.3"  "nvm ls 0.2 should not contain v0.1.3"
+}
+
+@test 'Listing versions/Running "nvm ls foo" should return a nonzero exit code when not found' {
+
+    run nvm ls nonexistent_version
+    assert_equal 3 "$status"
+}
+
+@test 'Listing versions/Running "nvm ls node" should return a nonzero exit code when not found' {
+
+    run nvm ls node
+    assert_equal 3 "$status"
+}
+
+@test 'Listing versions/Running "nvm ls stable" and "nvm ls unstable" should return the appropriate implicit alias' {
+
+    mkdir -p v0.2.3
+    mkdir -p v0.3.3
+
+    run nvm ls stable
+    assert_match "$output" "0.2.3" "expected 'nvm ls stable' to give STABLE_VERSION"
+
+    run nvm ls unstable
+    assert_match "$output" "0.3.3" "expected 'nvm ls unstable' to give UNSTABLE_VERSION"
+    mkdir -p v0.1.2
+    nvm alias stable 0.1
+
+    run nvm ls stable
+    assert_nomatch "$output" "0.2.3" "expected 'nvm ls stable' to not give old STABLE_VERSION"
+    assert_match   "$output" "v0.1.2" "expected 'nvm ls stable' to give new STABLE_VERSION"
+}
+
+## merged two tests here
+# `nvm ls` and `nvm ls system`
+@test 'Listing versions/Running "nvm ls [system]" should include "system" when appropriate' {
+
+    mkdir -p v0.{0,3}.{1,3,9}
+
+    nvm_has_system_node() { return 0; }
+    run nvm ls system
+    assert_match "$output" system '"nvm ls system" did not contain "system" when system node is present'
+
+    run nvm ls
+    assert_match "$output" system '"nvm ls" did not contain "system" when system node is present'
+    
+    nvm_has_system_node() { return 1; }
+    run nvm ls system
+    assert_nomatch "$output" system '"nvm ls system" contained "system" when system node is NOT present'
+
+    run nvm ls
+    assert_nomatch "$output" system '"nvm ls" contained "system" when system node is NOT present'
+}
+
+@test 'Listing versions/Running "nvm ls" should display all installed versions.' {
+
+    mkdir -p v0.{0,3}.{1,3,9}
+
+    run nvm ls
+    assert_match "$output" v0.0.1
+    assert_match "$output" v0.0.3
+    assert_match "$output" v0.0.9
+    assert_match "$output" v0.3.1
+    assert_match "$output" v0.3.3
+    assert_match "$output" v0.3.9
+}
+
+@test 'Listing versions/Running "nvm ls" should filter out ".nvm"' {
+
+    mkdir -p v0.{1,2}.3
+
+    run nvm ls
+    assert_nomatch "$output" "^ *\." "running 'nvm ls' should filter out dotfiles"
+}
+
+@test 'Listing versions/Running "nvm ls" should filter out "versions"' {
+
+    mkdir -p v0.{1,2}.3 versions
+    run nvm ls
+    assert_nomatch "$output" versions "running 'nvm ls' should filter out 'versions'"
+}
+
+@test 'Listing versions/Running "nvm ls" should list versions both in and out of the "versions" directory' {
+
+    mkdir -p versions/v0.12.1
+    mkdir -p v0.1.3
+
+    run nvm ls 0.12
+    assert_match "$output" "v0.12.1" "'nvm ls' did not list a version in versions/"
+
+    run nvm ls 0.1
+    assert_match "$output" "v0.1.3" "'nvm ls' did not list a version NOT in versions/"
+
+}
+
+@test 'Listing versions/Running "nvm ls" with node-like versioning vx.x.x should only list a matched version' {
+
+    mkdir -p v0.1.2
+
+    run nvm ls v0.1
+    assert_match "$output" "v0.1.2"
+
+    run nvm ls v0.1.2
+    assert_match "$output" "v0.1.2"
+
+    run nvm ls v0.1.
+    assert_match "$output" "v0.1.2"
+    
+    run nvm ls v0.1.1
+    assert_nomatch "$output" "v0.1.2"
+    assert_match   "$output" "N/A"
+}
diff --git a/test/bats/test_helper.bash b/test/bats/test_helper.bash
new file mode 100644
index 0000000..9a2f2aa
--- /dev/null
+++ b/test/bats/test_helper.bash
@@ -0,0 +1,152 @@
+# test_helper.bash stolen from rbenv
+#
+#unset RBENV_VERSION
+#unset RBENV_DIR
+
+if enable -f "${BATS_TEST_DIRNAME}"/../libexec/rbenv-realpath.dylib realpath 2>/dev/null; then
+  RBENV_TEST_DIR="$(realpath "$BATS_TMPDIR")/rbenv"
+else
+  if [ -n "$RBENV_NATIVE_EXT" ]; then
+    echo "rbenv: failed to load \`realpath' builtin" >&2
+    exit 1
+  fi
+  RBENV_TEST_DIR="${BATS_TMPDIR}/rbenv"
+fi
+
+# guard against executing this block twice due to bats internals
+if [ "$RBENV_ROOT" != "${RBENV_TEST_DIR}/root" ]; then
+  export RBENV_ROOT="${RBENV_TEST_DIR}/root"
+
+  PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin
+  PATH="${BATS_TEST_DIRNAME}/../libexec:$PATH"
+  PATH="${BATS_TEST_DIRNAME}/libexec:$PATH"
+  export PATH
+fi
+
+teardown() {
+  rm -rf "$RBENV_TEST_DIR"
+}
+
+flunk() {
+  { if [ "$#" -eq 0 ]; then cat -
+    else echo "$@"
+    fi
+  } | sed "s:${RBENV_TEST_DIR}:TEST_DIR:g" >&2
+  return 1
+}
+
+assert_success() {
+  if [ "$status" -ne 0 ]; then
+    flunk "command failed with exit status $status"
+  elif [ "$#" -gt 0 ]; then
+    assert_output "$1"
+  fi
+}
+
+assert_failure() {
+  if [ "$status" -eq 0 ]; then
+    flunk "expected failed exit status"
+  elif [ "$#" -gt 0 ]; then
+    assert_output "$1"
+  fi
+}
+
+assert_equal() {
+  if [ "$1" != "$2" ]; then
+    { [ -z "$3" ] || echo "$3"
+      echo "expected: $1"
+      echo "actual:   $2"
+    } | flunk
+  fi
+}
+
+assert_match() {
+  if [[ ! "$1" =~ $2 ]]; then
+    { [ -z "$3" ] || echo "$3"
+      echo "expected: $1"
+      echo "to match: $2"
+    } | flunk
+  fi
+}
+
+assert_nomatch() {
+  if [[ "$1" =~ $2 ]]; then
+    { [ -z "$3" ] || echo "$3"
+      echo "expected    : $1"
+      echo "to not match: $2"
+    } | flunk
+  fi
+}
+
+assert_unequal() {
+  if [ "$1" = "$2" ]; then
+    { [ -z "$3" ] || echo "$3"
+      echo "expected:   $1"
+      echo "unequal to: $2"
+    } | flunk
+  fi
+}
+
+assert_output() {
+  local expected
+  if [ $# -eq 0 ]; then expected="$(cat -)"
+  else expected="$1"
+  fi
+  assert_equal "$expected" "$output"
+}
+
+assert_line() {
+  if [ "$1" -ge 0 ] 2>/dev/null; then
+    assert_equal "$2" "${lines[$1]}" "$3"
+  else
+    local line
+    for line in "${lines[@]}"; do
+      if [ "$line" = "$1" ]; then return 0; fi
+    done
+    flunk "expected line \`$1'"
+  fi
+}
+
+refute_line() {
+  if [ "$1" -ge 0 ] 2>/dev/null; then
+    local num_lines="${#lines[@]}"
+    if [ "$1" -lt "$num_lines" ]; then
+      flunk "output has $num_lines lines"
+    fi
+  else
+    local line
+    for line in "${lines[@]}"; do
+      if [ "$line" = "$1" ]; then
+        flunk "expected to not find line \`$line'"
+      fi
+    done
+  fi
+}
+
+assert() {
+  if ! "$@"; then
+    flunk "failed: $@"
+  fi
+}
+
+# Output a modified PATH that ensures that the given executable is not present,
+# but in which system utils necessary for rbenv operation are still available.
+path_without() {
+  local exe="$1"
+  local path="${PATH}:"
+  local found alt util
+  for found in $(which -a "$exe"); do
+    found="${found%/*}"
+    if [ "$found" != "${RBENV_ROOT}/shims" ]; then
+      alt="${RBENV_TEST_DIR}/$(echo "${found#/}" | tr '/' '-')"
+      mkdir -p "$alt"
+      for util in bash head cut readlink greadlink; do
+        if [ -x "${found}/$util" ]; then
+          ln -s "${found}/$util" "${alt}/$util"
+        fi
+      done
+      path="${path/${found}:/${alt}:}"
+    fi
+  done
+  echo "${path%:}"
+}
diff --git a/test/bats/unit-tests.bats b/test/bats/unit-tests.bats
new file mode 100644
index 0000000..1a070d1
--- /dev/null
+++ b/test/bats/unit-tests.bats
@@ -0,0 +1,387 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+NVM_SRC_DIR="${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() {
+    false # set to 'false' to run all tests; set to 'true' to skip implemented tests
+    # only used while porting to bats: remove afterward
+}
+
+setup() {
+    test_debug && echo 'setup' >&2
+    NVM_DIR="${BATS_TMPDIR}"
+    cd "${NVM_DIR}"
+    rm -Rf src alias v*
+    mkdir src alias
+    load "${NVM_SRC_DIR}/nvm.sh"
+}
+
+teardown() {
+    test_debug && echo 'teardown' >&2
+    NVM_DIR="${BATS_TMPDIR}"
+    cd "${NVM_DIR}"
+    rm -Rf src alias v*
+}
+
+@test './Unit tests/nvm_alias' {
+    test_implementing && skip
+
+    run nvm_alias
+    assert_equal 1 "$status" "nvm_alias should exit with code 1 for missing"
+    assert_match "$output" "An alias is required."
+
+    run nvm_alias nonexistent
+    assert_equal 2 "$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' {
+    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' {
+    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' {
+    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' {
+    test_implementing && skip
+
+    nvm_has cat
+    type cat
+
+    ! nvm_has foobarbaz
+    ! type foobarbaz
+}
+
+@test './Unit tests/nvm_has_system_node' {
+    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' {
+    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' {
+    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 "$output" "0.11.14"
+}
+
+
+@test './Unit tests/nvm_num_version_groups' {
+    test_implementing && skip
+    
+    assert_equal "0" "$(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' {
+    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: $NEW_PATH "
+}
+
+@test './Unit tests/nvm_print_implicit_alias errors' {
+    test_implementing && skip
+
+    run nvm_print_implicit_alias
+    assert_match "$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" "$status"
+}
+
+@test './Unit tests/nvm_print_implicit_alias success' {
+    test_implementing && skip
+
+    mkdir -p v0.2.3 v0.3.4 v0.4.6 v0.5.7 v0.7.7
+    
+    run nvm_print_implicit_alias local stable
+    assert_match "$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 "$output" "0.9"
+}
+
+@test './Unit tests/nvm_remote_version' {
+    test_implementing && skip
+
+    nvm_ls_remote() {
+        echo "N/A"
+    }
+
+    run nvm_remote_version foo
+    assert_match "$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' {
+    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: $STRIPPED_PATH "
+    
+}
+
+@test './Unit tests/nvm_tree_contains_path' {
+    test_implementing && skip
+
+    mkdir -p tmp tmp2
+    touch tmp/node tmp2/node
+
+    run nvm_tree_contains_path
+    assert_equal "2" "$status"
+    assert_match "$output" "both the tree and the node path are required" "expected error messge with no args"
+
+    nvm_tree_contains_path   tmp  tmp/node
+    ! nvm_tree_contains_path tmp  tmp2/node
+    ! nvm_tree_contains_path tmp2 tmp/node
+    nvm_tree_contains_path   tmp2 tmp2/node    
+}
+
+@test './Unit tests/nvm_validate_implicit_alias' {
+    test_implementing && skip
+
+    run nvm_validate_implicit_alias
+    assert_match "$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' {
+#    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' {
+#    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' {
+#    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
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