chore: simplify test helpers (#250)

* chore: simplify test helpers

.eslintrc.json

@@ -40,6 +40,7 @@
     ],
     "node/no-extraneous-require": "off",
     "node/no-unpublished-require": "off",
+    "node/no-unsupported-features/es-syntax": "off",
     "prefer-destructuring": "off",
     "prefer-object-spread": "off",
     "strict": "off",
@@ -55,7 +56,7 @@
       }
     },
     {
-      "files": ["integration/**", "**/__tests__/**", "**/__mocks__/**", "**/__helpers__/**"],
+      "files": ["integration/**", "helpers/**", "**/__tests__/**", "**/__mocks__/**", "**/__helpers__/**"],
       "env": {
         "jest": true
       },

helpers/command-runner/index.js → helpers/cli.js

@@ -1,9 +1,11 @@
 'use strict';
 
+const execa = require('execa');
 const path = require('path');
-const lernaCLI = require('../../packages/cli/src/lerna-cli');
+const lernaCLI = require('../packages/cli/src/lerna-cli');
 
-module.exports = commandRunner;
+// eslint-disable-next-line node/no-unpublished-require
+const LERNA_BIN = require.resolve('../packages/cli/src/cli');
 
 /**
  * A higher-order function to help with passing _actual_ yargs-parsed argv
@@ -12,7 +14,7 @@ module.exports = commandRunner;
  * @param {Object} commandModule The yargs command exports
  * @return {Function} with partially-applied yargs config
  */
-function commandRunner(commandModule) {
+exports.commandRunner = function commandRunner(commandModule) {
   /* eslint-disable import/no-dynamic-require, global-require */
   const cmd = commandModule.command.split(' ')[0];
 
@@ -28,8 +30,8 @@ function commandRunner(commandModule) {
       .wrap(null)
       .command(commandModule);
 
-    return (...args) => {
-      return new Promise((resolve, reject) => {
+    return (...args) =>
+      new Promise((resolve, reject) => {
         const yargsMeta = {};
 
         const context = {
@@ -65,6 +67,23 @@ function commandRunner(commandModule) {
           })
           .parse([cmd, ...args], context, parseFn);
       });
-    };
   };
-}
+};
+
+exports.cliRunner = function cliRunner(cwd, env) {
+  const opts = {
+    cwd,
+    env: Object.assign(
+      {
+        CI: 'true',
+        // always turn off chalk
+        FORCE_COLOR: '0',
+      },
+      env
+    ),
+    // when debugging integration test snapshots, uncomment next line
+    // stdio: ["ignore", "inherit", "inherit"],
+  };
+
+  return (...args) => execa('node', [LERNA_BIN].concat(args), opts);
+};

helpers/fixtures.js

@@ -0,0 +1,83 @@
+'use strict';
+
+const execa = require('execa');
+const fileUrl = require('file-url');
+const tempy = require('tempy');
+const fs = require('fs-extra');
+const findUp = require('find-up');
+const path = require('path');
+const { gitAdd, gitCommit, gitInit } = require('./git');
+
+function cloneFixtureFactory(startDir) {
+  const initFixture = initFixtureFactory(startDir);
+
+  return (...args) =>
+    initFixture(...args).then((cwd) => {
+      const repoDir = tempy.directory();
+      const repoUrl = fileUrl(repoDir, { resolve: false });
+
+      return execa('git', ['init', '--bare'], { cwd: repoDir })
+        .then(() => execa('git', ['checkout', '-B', 'main'], { cwd }))
+        .then(() => execa('git', ['remote', 'add', 'origin', repoUrl], { cwd }))
+        .then(() => execa('git', ['push', '-u', 'origin', 'main'], { cwd }))
+        .then(() => ({
+          cwd,
+          repository: repoUrl,
+        }));
+    });
+}
+exports.cloneFixtureFactory = cloneFixtureFactory;
+
+function findFixture(cwd, fixtureName) {
+  return findUp(path.join('__fixtures__', fixtureName), { cwd, type: 'directory' }).then((fixturePath) => {
+    if (fixturePath === undefined) {
+      throw new Error(`Could not find fixture with name "${fixtureName}"`);
+    }
+
+    return fixturePath;
+  });
+}
+
+function copyFixture(targetDir, fixtureName, cwd) {
+  return findFixture(cwd, fixtureName).then((fp) => fs.copy(fp, targetDir));
+}
+exports.copyFixture = copyFixture;
+
+function initFixtureFactory(startDir) {
+  return (fixtureName, commitMessage = 'Init commit') => {
+    const cwd = tempy.directory();
+    let chain = Promise.resolve();
+
+    chain = chain.then(() => process.chdir(cwd));
+    chain = chain.then(() => copyFixture(cwd, fixtureName, startDir));
+    chain = chain.then(() => gitInit(cwd, '.'));
+
+    if (commitMessage) {
+      chain = chain.then(() => gitAdd(cwd, '-A'));
+      chain = chain.then(() => gitCommit(cwd, commitMessage));
+    }
+
+    return chain.then(() => cwd);
+  };
+}
+exports.initFixtureFactory = initFixtureFactory;
+
+function initNamedFixtureFactory(startDir) {
+  return (dirName, fixtureName, commitMessage = 'Init commit') => {
+    const cwd = path.join(tempy.directory(), dirName);
+    let chain = Promise.resolve();
+
+    chain = chain.then(() => fs.ensureDir(cwd));
+    chain = chain.then(() => process.chdir(cwd));
+    chain = chain.then(() => copyFixture(cwd, fixtureName, startDir));
+    chain = chain.then(() => gitInit(cwd, '.'));
+
+    if (commitMessage) {
+      chain = chain.then(() => gitAdd(cwd, '-A'));
+      chain = chain.then(() => gitCommit(cwd, commitMessage));
+    }
+
+    return chain.then(() => cwd);
+  };
+}
+exports.initNamedFixtureFactory = initNamedFixtureFactory;