test: add tests for commit messages with bodies

Adds test cases to verify that the `package-reference-format`
commitlint rule only applies to commit subjects, not bodies.
This confirms that including `@stdlib/` prefixes in commit
message bodies (e.g., for breaking change descriptions) is
acceptable.

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: na
  - task: lint_package_json
    status: na
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: na
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: passed
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: passed
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: Planeshifter

lib/node_modules/@stdlib/_tools/commitlint/rules/package-reference-format/test/test.js

@@ -172,3 +172,22 @@ tape( 'the function returns `[ true, \'\' ]` for empty or missing subject', func
 	t.deepEqual( result, [ true, '' ], 'returns expected value' );
 	t.end();
 });
+
+tape( 'the function only applies to commit subjects, not bodies', function test( t ) {
+	var result;
+
+	// A valid subject with body containing `@stdlib/` prefix should pass:
+	result = rule({
+		'subject': 'remove: remove `dmax` from namespace',
+		'body': 'This commit removes the `dmax` symbol from the `@stdlib/stats/base` namespace due to a package migration.\n\nBREAKING CHANGE: remove `dmax`\n\nTo migrate, users should access the same symbol via the `@stdlib/stats/strided` namespace.'
+	}, 'always' );
+	t.deepEqual( result, [ true, '' ], 'returns expected value' );
+
+	// A valid subject with body containing unquoted package paths should pass:
+	result = rule({
+		'subject': 'remove: remove `stats/base/dmax`',
+		'body': 'This commit removes @stdlib/stats/base/dmax in favor of @stdlib/stats/strided/dmax.\n\nBREAKING CHANGE: remove stats/base/dmax'
+	}, 'always' );
+	t.deepEqual( result, [ true, '' ], 'returns expected value' );
+	t.end();
+});