add tests for rehash, whence, which

test/which.bats

@@ -0,0 +1,57 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+create_executable() {
+  local bin
+  if [[ $1 == */* ]]; then bin="$1"
+  else bin="${RBENV_ROOT}/versions/${1}/bin"
+  fi
+  mkdir -p "$bin"
+  touch "${bin}/$2"
+  chmod +x "${bin}/$2"
+}
+
+@test "outputs path to executable" {
+  create_executable "1.8" "ruby"
+  create_executable "2.0" "rspec"
+
+  RBENV_VERSION=1.8 run rbenv-which ruby
+  assert_success "${RBENV_ROOT}/versions/1.8/bin/ruby"
+
+  RBENV_VERSION=2.0 run rbenv-which rspec
+  assert_success "${RBENV_ROOT}/versions/2.0/bin/rspec"
+}
+
+@test "searches PATH for system version" {
+  create_executable "${RBENV_TEST_DIR}/bin" "kill-all-humans"
+  create_executable "${RBENV_ROOT}/shims" "kill-all-humans"
+
+  RBENV_VERSION=system run rbenv-which kill-all-humans
+  assert_success "${RBENV_TEST_DIR}/bin/kill-all-humans"
+}
+
+@test "version not installed" {
+  create_executable "2.0" "rspec"
+  RBENV_VERSION=1.9 run rbenv-which rspec
+  assert_failure "rbenv: version \`1.9' is not installed"
+}
+
+@test "no executable found" {
+  create_executable "1.8" "rspec"
+  RBENV_VERSION=1.8 run rbenv-which rake
+  assert_failure "rbenv: rake: command not found"
+}
+
+@test "executable found in other versions" {
+  create_executable "1.8" "ruby"
+  create_executable "1.9" "rspec"
+  create_executable "2.0" "rspec"
+
+  RBENV_VERSION=1.8 run rbenv-which rspec
+  assert_failure "\
+    rbenv: rspec: command not found
+    The \`rspec' command exists in these Ruby versions:
+      1.9
+      2.0"
+}