add tests for `help` and `rbenv --version`

test/--version.bats

@@ -0,0 +1,46 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+setup() {
+  mkdir -p "$HOME"
+  git config --global user.name  "Tester"
+  git config --global user.email "tester@test.local"
+}
+
+git_commit() {
+  git commit --quiet --allow-empty -m "" --allow-empty-message
+}
+
+@test "default version" {
+  assert [ ! -e "$RBENV_ROOT" ]
+  run rbenv---version
+  assert_success
+  [[ $output == "rbenv 0."* ]]
+}
+
+@test "reads version from git repo" {
+  mkdir -p "$RBENV_ROOT"
+  cd "$RBENV_ROOT"
+  git init
+  git_commit
+  git tag v0.4.1
+  git_commit
+  git_commit
+
+  cd "$RBENV_TEST_DIR"
+  run rbenv---version
+  assert_success
+  [[ $output == "rbenv 0.4.1-2-g"* ]]
+}
+
+@test "prints default version if no tags in git repo" {
+  mkdir -p "$RBENV_ROOT"
+  cd "$RBENV_ROOT"
+  git init
+  git_commit
+
+  cd "$RBENV_TEST_DIR"
+  run rbenv---version
+  [[ $output == "rbenv 0."* ]]
+}

test/help.bats

@@ -0,0 +1,115 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+@test "without args shows summary of common commands" {
+  run rbenv-help
+  assert_success
+  assert_line "Usage: rbenv <command> [<args>]"
+  assert_line "Some useful rbenv commands are:"
+}
+
+@test "invalid command" {
+  run rbenv-help hello
+  assert_failure "rbenv: no such command \`hello'"
+}
+
+@test "shows help for a specific command" {
+  mkdir -p "${RBENV_TEST_DIR}/bin"
+  cat > "${RBENV_TEST_DIR}/bin/rbenv-hello" <<SH
+#!shebang
+# Usage: rbenv hello <world>
+# Summary: Says "hello" to you, from rbenv
+# This command is useful for saying hello.
+echo hello
+SH
+
+  run rbenv-help hello
+  assert_success
+  assert_output <<SH
+Usage: rbenv hello <world>
+
+This command is useful for saying hello.
+SH
+}
+
+@test "replaces missing extended help with summary text" {
+  mkdir -p "${RBENV_TEST_DIR}/bin"
+  cat > "${RBENV_TEST_DIR}/bin/rbenv-hello" <<SH
+#!shebang
+# Usage: rbenv hello <world>
+# Summary: Says "hello" to you, from rbenv
+echo hello
+SH
+
+  run rbenv-help hello
+  assert_success
+  assert_output <<SH
+Usage: rbenv hello <world>
+
+Says "hello" to you, from rbenv
+SH
+}
+
+@test "extracts only usage" {
+  mkdir -p "${RBENV_TEST_DIR}/bin"
+  cat > "${RBENV_TEST_DIR}/bin/rbenv-hello" <<SH
+#!shebang
+# Usage: rbenv hello <world>
+# Summary: Says "hello" to you, from rbenv
+# This extended help won't be shown.
+echo hello
+SH
+
+  run rbenv-help --usage hello
+  assert_success "Usage: rbenv hello <world>"
+}
+
+@test "multiline usage section" {
+  mkdir -p "${RBENV_TEST_DIR}/bin"
+  cat > "${RBENV_TEST_DIR}/bin/rbenv-hello" <<SH
+#!shebang
+# Usage: rbenv hello <world>
+#        rbenv hi [everybody]
+#        rbenv hola --translate
+# Summary: Says "hello" to you, from rbenv
+# Help text.
+echo hello
+SH
+
+  run rbenv-help hello
+  assert_success
+  assert_output <<SH
+Usage: rbenv hello <world>
+       rbenv hi [everybody]
+       rbenv hola --translate
+
+Help text.
+SH
+}
+
+@test "multiline extended help section" {
+  mkdir -p "${RBENV_TEST_DIR}/bin"
+  cat > "${RBENV_TEST_DIR}/bin/rbenv-hello" <<SH
+#!shebang
+# Usage: rbenv hello <world>
+# Summary: Says "hello" to you, from rbenv
+# This is extended help text.
+# It can contain multiple lines.
+#
+# And paragraphs.
+
+echo hello
+SH
+
+  run rbenv-help hello
+  assert_success
+  assert_output <<SH
+Usage: rbenv hello <world>
+
+This is extended help text.
+It can contain multiple lines.
+
+And paragraphs.
+SH
+}