Merge pull request #19 from Arcanemagus/tests

Add basic tests using Jest

Author: Arcanemagus

.npmignore

@@ -1,4 +1,5 @@
 # Remove some files from the released version
+__tests__/*
 .npmignore
 .gitignore
 .gitattributes

__tests__/.eslintrc.js

@@ -0,0 +1,5 @@
+module.exports = {
+  "env": {
+    "jest": true,
+  }
+};

__tests__/check-peer-deps.test.js

@@ -0,0 +1,42 @@
+const { exec: execCP } = require('child_process');
+const { promisify } = require('util');
+const path = require('path');
+
+const exec = promisify(execCP);
+
+const cpdBinPath = path.join(__dirname, '..', 'bin', 'check-peer-deps-cli.js');
+const fixtures = path.join(__dirname, 'fixtures');
+
+const EXEC_TIMEOUT = 20 * 1000; // 20 * 1000 ms = 20 seconds
+
+const runCPD = async (args = [], options = {}) => {
+  jest.setTimeout(EXEC_TIMEOUT);
+  const command = [`"${process.execPath}"`, `"${cpdBinPath}"`]
+    .concat(args).join(' ');
+  return exec(command, options);
+};
+
+test('Finds nothing wrong with a good dependency tree', async () => {
+  expect.assertions(2);
+  const output = await runCPD([], { cwd: path.join(fixtures, 'goodDep') });
+  expect(output.stdout).toBe('');
+  expect(output.stderr).toBe('');
+});
+
+test('Finds the missing dependencies in a broken tree', async () => {
+  expect.assertions(3);
+  const output = await runCPD([], { cwd: path.join(fixtures, 'missingDep') });
+  expect(output.stdout).toBe('');
+  const issues = output.stderr.split('\n');
+  expect(issues[0]).toBe("A dependency satisfying eslint-config-airbnb-base's " +
+    "peerDependency of 'eslint@^4.9.0' was not found!");
+  expect(issues[1]).toBe("A dependency satisfying eslint-config-airbnb-base's " +
+    "peerDependency of 'eslint-plugin-import@^2.7.0' was not found!");
+});
+
+test('Finds nothing wrong with no peerDependencies in the tree', async () => {
+  expect.assertions(2);
+  const output = await runCPD([], { cwd: path.join(fixtures, 'noPeerDeps') });
+  expect(output.stdout).toBe('');
+  expect(output.stderr).toBe('');
+});

__tests__/fixtures/goodDep/.gitignore

@@ -0,0 +1 @@
+!node_modules/

__tests__/fixtures/goodDep/node_modules/eslint-config-airbnb-base/package.json

@@ -0,0 +1,7 @@
+{
+  "dependencies": {
+    "eslint": "4.9.0",
+    "eslint-config-airbnb-base": "12.1.0",
+    "eslint-plugin-import": "2.7.0"
+  }
+}

__tests__/fixtures/goodDep/node_modules/eslint-plugin-import/package.json

@@ -0,0 +1 @@
+!node_modules/