Make lastCommit and changedFilesWithAncestor work through config

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ### Features
 
+* `[jest-config]` Allow lastComit and changedFilesWithAncestor via JSON config
+  ([#5476](https://github.com/facebook/jest/pull/5476))
 * `[jest-util]` Add deletion to `process.env` as well
   ([#5466](https://github.com/facebook/jest/pull/5466))
 * `[jest-util]` Add case-insensitive getters/setters to `process.env`

packages/jest-changed-files/src/hg.js

@@ -17,6 +17,17 @@ const env = Object.assign({}, process.env, {
   HGPLAIN: 1,
 });
 
+const ANCESTORS = [
+  // Parent commit to this one.
+  '.^',
+
+  // The first commit of my branch, only if we are not on the default branch.
+  'min(branch(.)) and not min(branch(default))',
+
+  // Latest public commit.
+  'max(public())',
+];
+
 const adapter: SCMAdapter = {
   findChangedFiles: async (
     cwd: string,
@@ -25,7 +36,7 @@ const adapter: SCMAdapter = {
     return new Promise((resolve, reject) => {
       let args = ['status', '-amnu'];
       if (options && options.withAncestor) {
-        args.push('--rev', 'ancestor(.^)');
+        args.push('--rev', `ancestor(${ANCESTORS.join(', ')})`);
       } else if (options && options.changedSince) {
         args.push('--rev', `ancestor(., ${options.changedSince})`);
       } else if (options && options.lastCommit === true) {

packages/jest-cli/src/__tests__/cli/args.test.js

@@ -38,12 +38,6 @@ describe('check', () => {
     );
   });
 
-  it('sets onlyChanged if lastCommit is specified', () => {
-    const argv: Argv = {lastCommit: true};
-    check(argv);
-    expect(argv.onlyChanged).toBe(true);
-  });
-
   it('raises an exception if findRelatedTests is specified with no file paths', () => {
     const argv: Argv = {_: [], findRelatedTests: true};
     expect(() => check(argv)).toThrow(

packages/jest-cli/src/cli/args.js

@@ -26,9 +26,6 @@ export const check = (argv: Argv) => {
     'changedFilesWithAncestor',
     'changedSince',
   ]) {
-    if (argv[key]) {
-      argv.onlyChanged = true;
-    }
     if (argv[key] && argv.watchAll) {
       throw new Error(
         `Both --${key} and --watchAll were specified, but these two ` +
@@ -113,6 +110,7 @@ export const options = {
     type: 'string',
   },
   changedFilesWithAncestor: {
+    default: undefined,
     description:
       'Runs tests related to the current changes and the changes made in the ' +
       'last commit. Behaves similarly to `--onlyChanged`.',

packages/jest-config/src/defaults.js

@@ -33,6 +33,7 @@ export default ({
   browser: false,
   cache: true,
   cacheDirectory,
+  changedFilesWithAncestor: false,
   clearMocks: false,
   coveragePathIgnorePatterns: [NODE_MODULES_REGEXP],
   coverageReporters: ['json', 'text', 'lcov', 'clover'],

packages/jest-config/src/normalize.js

@@ -474,6 +474,7 @@ export default function normalize(options: InitialOptions, argv: Argv) {
       case 'findRelatedTests':
       case 'forceCoverageMatch':
       case 'forceExit':
+      case 'lastCommit':
       case 'listTests':
       case 'logHeapUsage':
       case 'mapCoverage':
@@ -521,7 +522,6 @@ export default function normalize(options: InitialOptions, argv: Argv) {
   newOptions.nonFlagArgs = argv._;
   newOptions.testPathPattern = buildTestPathPattern(argv);
   newOptions.json = argv.json;
-  newOptions.lastCommit = argv.lastCommit;
 
   newOptions.testFailureExitCode = parseInt(newOptions.testFailureExitCode, 10);
 
@@ -571,6 +571,16 @@ export default function normalize(options: InitialOptions, argv: Argv) {
     );
   }
 
+  for (const key of [
+    'lastCommit',
+    'changedFilesWithAncestor',
+    'changedSince',
+  ]) {
+    if (newOptions[key]) {
+      newOptions.onlyChanged = true;
+    }
+  }
+
   return {
     hasDeprecationWarnings,
     options: newOptions,

packages/jest-config/src/valid_config.js

@@ -47,6 +47,7 @@ export default ({
     providesModuleNodeModules: ['react', 'react-native'],
   },
   json: false,
+  lastCommit: false,
   logHeapUsage: true,
   mapCoverage: false,
   moduleDirectories: ['node_modules'],

types/Config.js

@@ -27,6 +27,7 @@ export type DefaultOptions = {|
   browser: boolean,
   cache: boolean,
   cacheDirectory: Path,
+  changedFilesWithAncestor: boolean,
   clearMocks: boolean,
   coveragePathIgnorePatterns: Array<string>,
   coverageReporters: Array<string>,
@@ -98,6 +99,7 @@ export type InitialOptions = {
   haste?: HasteConfig,
   reporters?: Array<ReporterConfig | string>,
   logHeapUsage?: boolean,
+  lastCommit?: boolean,
   listTests?: boolean,
   mapCoverage?: boolean,
   moduleDirectories?: Array<string>,