feat(eslint-config-bananass): add tests for rules (#67)

This pull request introduces new test files and updates the build script
in the `packages/eslint-config-bananass` package. The most important
changes include adding tests for various rule files and updating the
`package.json` to include a test script.

### Tests added for rule files:
*
[`packages/eslint-config-bananass/src/rules/eslint.test.js`](diffhunk://#diff-75dfe640494934eadf36b6d985a90a3e7de4fbc4da55fd422d802e56f6d7519aR1-R44):
Added tests for `eslint-layout-formatting.js`,
`eslint-possible-problems.js`, and `eslint-suggestions.js` to ensure all
key values do not include the prefix `/`.
*
[`packages/eslint-config-bananass/src/rules/import.test.js`](diffhunk://#diff-d9bb1e9956c01e11d0b97a58cbb82ddeddb8f93cfb33197200fde583f374b1fcR1-R51):
Added tests for `import-helpful-warnings.js`,
`import-module-systems.js`, `import-static-analysis.js`, and
`import-style-guide.js` to ensure all key values start with the prefix
`import/`.
*
[`packages/eslint-config-bananass/src/rules/node.test.js`](diffhunk://#diff-549b1b007284f29d5d8ac701a47cdbe4cf71921877998ca97fa1e6630f30700dR1-R30):
Added tests for `node.js` to ensure all key values start with the prefix
`n/`.
*
[`packages/eslint-config-bananass/src/rules/stylistic-js.test.js`](diffhunk://#diff-6473b3d0e0f021ddcb34858d267d2b8c21dc2401f1c2f1593d08b8a0f0f92b28R1-R30):
Added tests for `stylistic-js.js` to ensure all key values start with
the prefix `@stylistic/js/`.

### Build script update:
*
[`packages/eslint-config-bananass/package.json`](diffhunk://#diff-e820b85e94fd5b26012547982c44a557398b5c3dc850ac0c4094d184dfd5bcbcL36-R37):
Updated the build script to include a test script that runs with `node
--test`.

packages/eslint-config-bananass/package.json

@@ -33,7 +33,8 @@
   },
   "scripts": {
     "prepublishOnly": "npm run build",
-    "build": "cp ../../LICENSE.md ../../README.md ."
+    "build": "cp ../../LICENSE.md ../../README.md .",
+    "test": "node --test"
   },
   "peerDependencies": {
     "eslint": "^9.0.0"

packages/eslint-config-bananass/src/rules/eslint.test.js

@@ -0,0 +1,44 @@
+/**
+ * @fileoverview Test for `eslint-layout-formatting.js`, `eslint-possible-problems.js`, `eslint-suggestions.js`.
+ */
+
+// --------------------------------------------------------------------------------
+// Require
+// --------------------------------------------------------------------------------
+
+const { strictEqual } = require('node:assert');
+const { describe, it } = require('node:test');
+
+const eslintLayoutFormatting = require('./eslint-layout-formatting');
+const eslintPossibleProblems = require('./eslint-possible-problems');
+const eslintSuggestions = require('./eslint-suggestions');
+
+// --------------------------------------------------------------------------------
+// Declaration
+// --------------------------------------------------------------------------------
+
+const prefix = '/';
+
+// --------------------------------------------------------------------------------
+// Test
+// --------------------------------------------------------------------------------
+
+describe(`All key values must not include \`${prefix}\`.`, () => {
+  it('eslint-layout-formatting.js', () => {
+    Object.keys(eslintLayoutFormatting).forEach(key => {
+      strictEqual(key.includes(prefix), false);
+    });
+  });
+
+  it('eslint-possible-problems.js', () => {
+    Object.keys(eslintPossibleProblems).forEach(key => {
+      strictEqual(key.includes(prefix), false);
+    });
+  });
+
+  it('eslint-suggestions.js', () => {
+    Object.keys(eslintSuggestions).forEach(key => {
+      strictEqual(key.includes(prefix), false);
+    });
+  });
+});

packages/eslint-config-bananass/src/rules/import.test.js

@@ -0,0 +1,51 @@
+/**
+ * @fileoverview Test for `import-helpful-warnings.js`, `import-module-systems.js`, `import-static-analysis.js`, and `import-style-guide.js`.
+ */
+
+// --------------------------------------------------------------------------------
+// Require
+// --------------------------------------------------------------------------------
+
+const { strictEqual } = require('node:assert');
+const { describe, it } = require('node:test');
+
+const importHelpfulWarnings = require('./import-helpful-warnings');
+const importModuleSystems = require('./import-module-systems');
+const importStaticAnalysis = require('./import-static-analysis');
+const importStyleGuide = require('./import-style-guide');
+
+// --------------------------------------------------------------------------------
+// Declaration
+// --------------------------------------------------------------------------------
+
+const prefix = 'import/';
+
+// --------------------------------------------------------------------------------
+// Test
+// --------------------------------------------------------------------------------
+
+describe(`All key values must start with \`${prefix}\`.`, () => {
+  it('import-helpful-warnings.js', () => {
+    Object.keys(importHelpfulWarnings).forEach(key => {
+      strictEqual(key.startsWith(prefix), true);
+    });
+  });
+
+  it('import-module-systems.js', () => {
+    Object.keys(importModuleSystems).forEach(key => {
+      strictEqual(key.startsWith(prefix), true);
+    });
+  });
+
+  it('import-static-analysis.js', () => {
+    Object.keys(importStaticAnalysis).forEach(key => {
+      strictEqual(key.startsWith(prefix), true);
+    });
+  });
+
+  it('import-style-guide.js', () => {
+    Object.keys(importStyleGuide).forEach(key => {
+      strictEqual(key.startsWith(prefix), true);
+    });
+  });
+});

packages/eslint-config-bananass/src/rules/node.test.js

@@ -0,0 +1,30 @@
+/**
+ * @fileoverview Test for `node.js`.
+ */
+
+// --------------------------------------------------------------------------------
+// Require
+// --------------------------------------------------------------------------------
+
+const { strictEqual } = require('node:assert');
+const { describe, it } = require('node:test');
+
+const node = require('./node');
+
+// --------------------------------------------------------------------------------
+// Declaration
+// --------------------------------------------------------------------------------
+
+const prefix = 'n/';
+
+// --------------------------------------------------------------------------------
+// Test
+// --------------------------------------------------------------------------------
+
+describe(`All key values must start with \`${prefix}\`.`, () => {
+  it('node.js', () => {
+    Object.keys(node).forEach(key => {
+      strictEqual(key.startsWith(prefix), true);
+    });
+  });
+});

packages/eslint-config-bananass/src/rules/stylistic-js.test.js

@@ -0,0 +1,30 @@
+/**
+ * @fileoverview Test for `stylistic-js.js`.
+ */
+
+// --------------------------------------------------------------------------------
+// Require
+// --------------------------------------------------------------------------------
+
+const { strictEqual } = require('node:assert');
+const { describe, it } = require('node:test');
+
+const stylisticJs = require('./stylistic-js');
+
+// --------------------------------------------------------------------------------
+// Declaration
+// --------------------------------------------------------------------------------
+
+const prefix = '@stylistic/js/';
+
+// --------------------------------------------------------------------------------
+// Test
+// --------------------------------------------------------------------------------
+
+describe(`All key values must start with \`${prefix}\`.`, () => {
+  it('stylistic-js.js', () => {
+    Object.keys(stylisticJs).forEach(key => {
+      strictEqual(key.startsWith(prefix), true);
+    });
+  });
+});