test: add end-to-end test

This test uses the plugin with @commitlint/load to verify that the rules created in this plugin can be used with commitlint.

jest.config.js

@@ -4,5 +4,5 @@ module.exports = {
   coverageDirectory: 'coverage',
   coverageReporters: ['cobertura', 'lcov', 'text'],
   preset: 'ts-jest',
-  roots: ['<rootDir>/src'],
+  roots: ['<rootDir>/src', '<rootDir>/test'],
 };

test/end-to-end.test.ts

@@ -0,0 +1,45 @@
+import * as plugin from '../src';
+import { Plugin, RuleOutcome, RulesConfig } from '@commitlint/types';
+import { describe, expect, it } from '@jest/globals';
+import lint from '@commitlint/lint';
+import load from '@commitlint/load';
+
+describe('commitlint plugin function rules', () => {
+  it('provides rules that can be used with commitlint', async () => {
+    for await (const rule of Object.keys(plugin.rules)) {
+      const results: RuleOutcome[] = [
+        [true],
+        [false, `error message from ${rule}`],
+      ];
+      for await (const result of results) {
+        const rules: Partial<RulesConfig> = {};
+        rules[rule] = [
+          2,
+          'always',
+          () => {
+            return result;
+          },
+        ];
+
+        const config = await load({
+          plugins: [plugin as Plugin],
+          rules,
+        });
+
+        const report = await lint('chore: basic commit message', config.rules, {
+          plugins: {
+            'function-rules': plugin as Plugin,
+          },
+        });
+
+        expect(report.valid).toEqual(result[0]);
+        if (result[1] !== undefined) {
+          expect(report.warnings).toHaveLength(0);
+          expect(report.errors).toHaveLength(1);
+          expect(report.errors[0].name).toEqual(rule);
+          expect(report.errors[0].message).toEqual(result[1]);
+        }
+      }
+    }
+  });
+});

tsconfig.json

@@ -7,6 +7,6 @@
     "strict": true,
     "target": "ES2020"
   },
-  "exclude": ["node_modules", "**/*.test.ts"],
-  "include": ["src/**/*.ts"]
+  "exclude": ["node_modules"],
+  "include": ["src/**/*.ts", "test/**/*.ts"]
 }