bats/helpers: Add skip_if_none_present_on_system

lib/bats/helpers

@@ -172,6 +172,29 @@ skip_if_system_missing() {
   fi
 }
 
+# Skips the current test if zero of the listed system programs are present.
+#
+# Useful for testing behavior that can use any one of a number of system
+# programs based on what's available, such as `./go get file` being able to use
+# `curl`, `fetch`, or `wget`.
+#
+# Arguments:
+#   $@:  System programs of which at least one must be present to run the test
+skip_if_none_present_on_system() {
+  local missing
+
+  if ! command -v "$@" >/dev/null; then
+    if [[ "$#" -eq '1' ]]; then
+      skip "$1 isn't installed on the system"
+    elif [[ "$#" -eq '2' ]]; then
+      skip "Neither $1 nor $2 is installed on the system"
+    else
+      printf -v missing '%s, ' "${@:1:$(($# - 1))}"
+      skip "None of ${missing% } or ${!#} are installed on the system"
+    fi
+   fi
+ }
+
 # Joins lines using a delimiter into a user-defined variable
 #
 # Just like `@go.join` from `lib/strings`, except that it doesn't depend on any

tests/bats-helpers.bats

@@ -170,6 +170,34 @@ __check_dirs_exist() {
     'ok 1 # skip (foo, bar, baz not installed on the system) skip if missing'
 }
 
+@test "$SUITE: skip_if_none_present_on_system" {
+  stub_program_in_path 'quux'
+  run_bats_test_suite_in_isolation 'skip-if-none-present-on-system-test.bats' \
+    "load '$_GO_CORE_DIR/lib/bats/helpers'" \
+    '@test "should not skip if at least one present" {' \
+    '  skip_if_none_present_on_system foo bar baz quux' \
+    '}'\
+    '@test "single program missing" {' \
+    '  skip_if_none_present_on_system foo' \
+    '}' \
+    '@test "two programs missing" {' \
+    '  skip_if_none_present_on_system foo bar' \
+    '}' \
+    '@test "three programs missing" {' \
+    '  skip_if_none_present_on_system foo bar baz' \
+    '}'
+  assert_success
+
+  local expected_messages=("foo isn't installed on the system"
+    'Neither foo nor bar is installed on the system'
+    'None of foo, bar, or baz are installed on the system')
+  assert_lines_equal '1..4' \
+    'ok 1 should not skip if at least one present' \
+    "ok 2 # skip (${expected_messages[0]}) single program missing" \
+    "ok 3 # skip (${expected_messages[1]}) two programs missing" \
+    "ok 4 # skip (${expected_messages[2]}) three programs missing"
+}
+
 @test "$SUITE: test_join fails if result variable name is invalid" {
   create_bats_test_script test-script \
     ". '$_GO_CORE_DIR/lib/bats/helpers'" \

tests/template.bats

@@ -75,25 +75,6 @@ assert_go_core_unpacked() {
   restore_bats_shell_options "$result"
 }
 
-# Skips the current test if zero of the listed system programs are present.
-#
-# Arguments:
-#   $@:  System programs of which at least one must be present to run the test
-skip_if_none_present_on_system() {
-  local missing
-
-  if ! command -v "$@" >/dev/null; then
-    if [[ "$#" -eq '1' ]]; then
-      skip "$1 isn't installed on the system"
-    elif [[ "$#" -eq '2' ]]; then
-      skip "Neither $1 nor $2 are installed on the system"
-    else
-      printf -v missing '%s, ' "${@:1:$(($# - 1))}"
-      skip "None of ${missing% } or ${@:$#} are installed on the system"
-    fi
-  fi
-}
-
 # Converts a Unix path or 'file://' URL to a Git for Windows native path.
 #
 # This is useful when passing file paths or URLs to native programs on Git for