feat: create jest config file

.vscode/launch.json

@@ -180,9 +180,9 @@
     {
       "type": "node",
       "request": "launch",
-      "name": "jest collector",
+      "name": "jest testing",
       "program": "${workspaceFolder}/node_modules/.bin/jest",
-      "cwd": "${workspaceFolder}/core/jest-collector",
+      "cwd": "${workspaceFolder}/core/jest-testing",
       "args": ["sum"],
       "console": "integratedTerminal",
       "internalConsoleOptions": "neverOpen",

core/jest-testing/.fixtures/__jest-1/jest.config.js

@@ -0,0 +1,12 @@
+module.exports = {
+  "preset": "ts-jest",
+  "transform": {
+    "^.+\\.(ts|tsx)?$": "ts-jest",
+    "^.+\\.(js|jsx)$": "babel-jest"
+  },
+  "collectCoverageFrom": [
+    "**/*.{js,jsx,tsx,ts}",
+    "!**/jest.config.js"
+  ]
+}
+

core/jest-testing/.fixtures/__jest-2/jest.config.js

@@ -0,0 +1,8 @@
+module.exports = {
+  "preset": "ts-jest",
+  "transform": {
+    "^.+\\.(ts|tsx)?$": "ts-jest",
+    "^.+\\.(js|jsx)$": "babel-jest"
+  }
+}
+

core/jest-testing/.fixtures/__jest-3/jest.config.js

@@ -0,0 +1,8 @@
+module.exports = {
+  "preset": "ts-jest",
+  "transform": {
+    "^.+\\.(ts|tsx)?$": "ts-jest",
+    "^.+\\.(js|jsx)$": "babel-jest"
+  }
+}
+

core/jest-testing/.fixtures/__jest-4/jest.config.js

@@ -0,0 +1,8 @@
+module.exports = {
+  "preset": "ts-jest",
+  "transform": {
+    "^.+\\.(ts|tsx)?$": "ts-jest",
+    "^.+\\.(js|jsx)$": "babel-jest"
+  }
+}
+

core/jest-testing/.fixtures/__jest-5/jest.config.js

@@ -0,0 +1,12 @@
+module.exports = {
+  "preset": "ts-jest",
+  "transform": {
+    "^.+\\.(ts|tsx)?$": "ts-jest",
+    "^.+\\.(js|jsx)$": "babel-jest"
+  },
+  "collectCoverageFrom": [
+    "**/*.{js,jsx,tsx,ts}",
+    "!**/jest.config.js"
+  ]
+}
+

core/jest-collector/package.json → core/jest-testing/package.json

@@ -1,7 +1,7 @@
 {
-  "name": "@component-controls/jest-collector",
+  "name": "@component-controls/jest-testing",
   "version": "3.4.5",
-  "description": "Given a file, gets the associated jest tests and their results",
+  "description": "Given a test file, extracts the tests, test results and coverage data",
   "keywords": [
     "jest",
     "testing"
@@ -30,13 +30,12 @@
   "repository": {
     "type": "git",
     "url": "https://github.com/ccontrols/component-controls.git",
-    "directory": "core/jest-collector"
+    "directory": "core/jest-testing"
   },
   "license": "MIT",
   "dependencies": {
     "jest-cli": "^26.4.2",
     "babel-jest": "^26.4.4",
-    "istanbul-lib-coverage": "^3.0.0",
     "ts-jest": "^26.4.4"
   },
   "devDependencies": {

core/jest-testing/src/index.ts

@@ -0,0 +1,96 @@
+import fs from 'fs';
+import path from 'path';
+import { runCLI } from 'jest';
+import { Config } from '@jest/types';
+import { AssertionResult, AggregatedResult } from '@jest/test-result';
+import { FileCoverage, CoverageSummary } from 'istanbul-lib-coverage';
+
+export const getUniqueFolder = (folder: string): string => {
+  let fnId = 1;
+  const fName = () => path.resolve(folder, `__jest-${fnId}`);
+  while (fs.existsSync(fName())) {
+    fnId += 1;
+  }
+  const folderName = fName();
+  fs.mkdirSync(folderName);
+  return folderName;
+};
+export interface JestResults {
+  /**
+   * test results
+   */
+  testResults: AssertionResult[];
+  /**
+   * coverage summary data, by file
+   */
+  coverage: Record<string, CoverageSummary>;
+}
+export const run = async (
+  testFilePath: string,
+  jestConfig?: Partial<Config.Argv>,
+): Promise<JestResults | undefined> => {
+  const testFolder = path.dirname(testFilePath);
+  const testFile = path.basename(testFilePath);
+  const configFolder = getUniqueFolder(testFolder);
+  const configFile = path.resolve(configFolder, 'jest.config.js');
+  fs.writeFileSync(
+    configFile,
+    `module.exports = ${JSON.stringify(
+      {
+        rootDir: '..',
+        preset: 'ts-jest',
+        transform: {
+          '^.+\\.(ts|tsx)?$': 'ts-jest',
+          '^.+\\.(js|jsx)$': 'babel-jest',
+        },
+        collectCoverageFrom: [
+          '**/*.{js,jsx,tsx,ts}',
+          '!**/jest.config.js',
+          '!**/*.{test,spec}.{js,ts}',
+        ],
+      },
+      null,
+      2,
+    )}
+  `,
+    'utf8',
+  );
+  let runResults: {
+    results: AggregatedResult;
+    globalConfig: Config.GlobalConfig;
+  };
+  try {
+    runResults = await runCLI(
+      {
+        $0: testFile,
+        silent: true,
+        verbose: false,
+        reporters: [],
+        coverage: true,
+        coverageReporters: ['none'],
+        watchman: false,
+        ...jestConfig,
+      } as Config.Argv,
+      [configFolder],
+    );
+  } catch (err) {
+    console.error(err);
+    return undefined;
+  } finally {
+    fs.unlinkSync(configFile);
+    fs.rmdirSync(configFolder, { recursive: true });
+  }
+  const cov = runResults.results.coverageMap;
+  const result: JestResults = {
+    testResults: runResults.results.testResults[0].testResults,
+    coverage: {},
+  };
+  if (cov) {
+    Object.keys(cov.data).forEach(file => {
+      const fc = cov.data[file] as FileCoverage;
+      result.coverage[path.relative(testFolder, file)] = fc.toSummary();
+    });
+  }
+
+  return result;
+};

core/jest-testing/test/sum.test.ts

@@ -0,0 +1,57 @@
+import path from 'path';
+import { run } from '../src';
+
+type Await<T> = T extends PromiseLike<infer U> ? U : T;
+
+let results: Await<ReturnType<typeof run>>;
+beforeAll(async () => {
+  results = await run(path.resolve(__dirname, '../.fixtures/sum.test.js'));
+}, 50000);
+
+describe('small test', () => {
+  it('testResults ', () => {
+    expect(results?.testResults[0]).toMatchObject({
+      ancestorTitles: ['testing sum'],
+      failureDetails: [],
+      failureMessages: [],
+      fullName: 'testing sum sum',
+      location: null,
+      numPassingAsserts: 0,
+      status: 'passed',
+      title: 'sum',
+    });
+  });
+
+  it('coverage ', () => {
+    expect(results?.coverage).toMatchObject({
+      'sum.js': {
+        data: {
+          lines: {
+            total: 1,
+            covered: 1,
+            skipped: 0,
+            pct: 100,
+          },
+          functions: {
+            total: 1,
+            covered: 1,
+            skipped: 0,
+            pct: 100,
+          },
+          statements: {
+            total: 2,
+            covered: 2,
+            skipped: 0,
+            pct: 100,
+          },
+          branches: {
+            total: 0,
+            covered: 0,
+            skipped: 0,
+            pct: 100,
+          },
+        },
+      },
+    });
+  });
+});