test: speed up config-lerna-scopes test suite (conventional-changelog#950)

Author: marionebl

@commitlint/config-lerna-scopes/index.test.js

@@ -1,4 +1,4 @@
-import {npm} from '@commitlint/test';
+import {lerna} from '@commitlint/test';
 import config from '.';
 
 test('exports rules key', () => {
@@ -46,27 +46,29 @@ test('scope-enum has expected modifier', async () => {
 
 test('returns empty value for empty lerna repository', async () => {
 	const {'scope-enum': fn} = config.rules;
-	const cwd = await npm.bootstrap('fixtures/empty', __dirname);
+	const cwd = await lerna.bootstrap('empty', __dirname);
 	const [, , value] = await fn({cwd});
 	expect(value).toEqual([]);
-}, 60000);
+});
 
 test('returns expected value for basic lerna repository', async () => {
 	const {'scope-enum': fn} = config.rules;
-	const cwd = await npm.bootstrap('fixtures/basic', __dirname);
+	const cwd = await lerna.bootstrap('basic', __dirname);
+
 	const [, , value] = await fn({cwd});
 	expect(value).toEqual(['a', 'b']);
-}, 60000);
+});
 
 test('returns expected value for scoped lerna repository', async () => {
 	const {'scope-enum': fn} = config.rules;
-	const cwd = await npm.bootstrap('fixtures/scoped', __dirname);
+	const cwd = await lerna.bootstrap('scoped', __dirname);
+
 	const [, , value] = await fn({cwd});
 	expect(value).toEqual(['a', 'b']);
-}, 60000);
+});
 
 test('works with lerna version < 3', async () => {
 	const {'scope-enum': fn} = config.rules;
-	const cwd = await npm.bootstrap('fixtures/lerna-two', __dirname);
+	const cwd = await lerna.bootstrap('lerna-two', __dirname);
 	await expect(fn({cwd})).resolves.toBeTruthy();
-}, 60000);
+});

@packages/test/src/index.ts

@@ -1,5 +1,6 @@
 import * as fix from './fix';
 import * as git from './git';
+import * as lerna from './lerna';
 import * as npm from './npm';
 
-export {fix, git, npm};
+export {fix, git, lerna, npm};

@packages/test/src/lerna.ts

@@ -0,0 +1,21 @@
+import path from 'path';
+import fs from 'fs-extra';
+import resolvePkg from 'resolve-pkg';
+import * as fix from './fix';
+
+export type LernaFixture = 'basic' | 'empty' | 'lerna-two' | 'scoped';
+
+export async function bootstrap(
+	fixture: string,
+	directory: string
+): Promise<string> {
+	const cwd = await fix.bootstrap(`fixtures/${fixture}`, directory);
+	const lerna = fixture === 'lerna-two' ? 'lerna-v2' : 'lerna-v3';
+	await fs.mkdirp(path.join(cwd, 'node_modules', '@lerna'));
+	await fs.symlink(
+		resolvePkg('@lerna/project')!,
+		path.join(cwd, 'node_modules', '@lerna', 'project')
+	);
+	await fs.symlink(resolvePkg(lerna)!, path.join(cwd, 'node_modules', 'lerna'));
+	return cwd;
+}

@packages/test/tsconfig.json

@@ -6,7 +6,7 @@
 		"outDir": "./lib"
 	},
 	"include": [
-		"./src"
+		"./src/**/*.ts"
 	],
 	"exclude": [
 		"./src/**/*.test.ts",

package.json

@@ -82,7 +82,9 @@
     "lint-staged": "10.0.7",
     "prettier": "1.17.1",
     "ts-jest": "25.2.0",
-    "typescript": "3.7.5"
+    "typescript": "3.7.5",
+    "lerna-v2": "npm:lerna@2",
+    "lerna-v3": "npm:lerna@3"
   },
   "husky": {
     "hooks": {