Initial demo

Author: FreeleX

.gitignore

@@ -0,0 +1 @@
+node_modules

README.md

@@ -1 +1,112 @@
-# jest-angular-memory-leak-example
+# jest-angular-memory-leak-example
+
+# Simple zone.js + jsdom memory leak example
+
+This repo was created for https://github.com/angular/angular/issues/24048 investigation
+
+[email protected]
+
+[email protected]
+
+[email protected]
+
+## Run `npm install` firstly
+
+## Run `npm test`
+
+```
+> jest --runInBand --logHeapUsage
+
+ PASS  __tests__/test10.spec.js (48 MB heap size)
+ PASS  __tests__/test19.spec.js (48 MB heap size)
+ PASS  __tests__/test11.spec.js (50 MB heap size)
+ PASS  __tests__/test14.spec.js (50 MB heap size)
+ PASS  __tests__/test20.spec.js (51 MB heap size)
+ PASS  __tests__/test25.spec.js (64 MB heap size)
+ PASS  __tests__/test12.spec.js (64 MB heap size)
+ PASS  __tests__/test16.spec.js (64 MB heap size)
+ PASS  __tests__/test8.spec.js (65 MB heap size)
+ PASS  __tests__/test13.spec.js (78 MB heap size)
+ PASS  __tests__/test18.spec.js (78 MB heap size)
+ PASS  __tests__/test15.spec.js (79 MB heap size)
+ PASS  __tests__/test17.spec.js (79 MB heap size)
+ PASS  __tests__/test1.spec.js (80 MB heap size)
+ PASS  __tests__/test2.spec.js (93 MB heap size)
+ PASS  __tests__/test4.spec.js (93 MB heap size)
+ PASS  __tests__/test3.spec.js (93 MB heap size)
+ PASS  __tests__/test7.spec.js (94 MB heap size)
+ PASS  __tests__/test24.spec.js (107 MB heap size)
+ PASS  __tests__/test6.spec.js (107 MB heap size)
+ PASS  __tests__/test21.spec.js (107 MB heap size)
+ PASS  __tests__/test23.spec.js (108 MB heap size)
+ PASS  __tests__/test9.spec.js (120 MB heap size)
+ PASS  __tests__/test5.spec.js (120 MB heap size)
+ PASS  __tests__/test22.spec.js (120 MB heap size)
+
+Test Suites: 25 passed, 25 total
+Tests:       25 passed, 25 total
+Snapshots:   0 total
+Time:        2.198s
+Ran all test suites.
+
+```
+
+As you can see there is steady heap usage increase
+
+## Run `npm test -- --detectLeaks`
+
+```
+● Test suite failed to run
+
+    EXPERIMENTAL FEATURE!
+    Your test suite is leaking memory. Please ensure all references are cleaned.
+
+    There is a number of things that can leak memory:
+      - Async operations that have not finished (e.g. fs.readFile).
+      - Timers not properly mocked (e.g. setInterval, setTimeout).
+      - Keeping references to the global scope.
+
+      at node_modules/jest/node_modules/jest-cli/build/test_scheduler.js:264:22
+```
+
+As you can see jest reports memory leaks
+
+## Comment/remove `require('zone.js/dist/zone.js');` in `setupJest.js` and run `npm test`
+
+```
+> jest --runInBand --logHeapUsage
+
+ PASS  __tests__/test10.spec.js (39 MB heap size)
+ PASS  __tests__/test12.spec.js (47 MB heap size)
+ PASS  __tests__/test14.spec.js (43 MB heap size)
+ PASS  __tests__/test13.spec.js (51 MB heap size)
+ PASS  __tests__/test11.spec.js (47 MB heap size)
+ PASS  __tests__/test17.spec.js (54 MB heap size)
+ PASS  __tests__/test16.spec.js (39 MB heap size)
+ PASS  __tests__/test20.spec.js (47 MB heap size)
+ PASS  __tests__/test19.spec.js (42 MB heap size)
+ PASS  __tests__/test25.spec.js (49 MB heap size)
+ PASS  __tests__/test5.spec.js (45 MB heap size)
+ PASS  __tests__/test7.spec.js (53 MB heap size)
+ PASS  __tests__/test21.spec.js (49 MB heap size)
+ PASS  __tests__/test9.spec.js (56 MB heap size)
+ PASS  __tests__/test22.spec.js (52 MB heap size)
+ PASS  __tests__/test18.spec.js (59 MB heap size)
+ PASS  __tests__/test4.spec.js (55 MB heap size)
+ PASS  __tests__/test8.spec.js (63 MB heap size)
+ PASS  __tests__/test2.spec.js (58 MB heap size)
+ PASS  __tests__/test24.spec.js (66 MB heap size)
+ PASS  __tests__/test6.spec.js (62 MB heap size)
+ PASS  __tests__/test23.spec.js (69 MB heap size)
+ PASS  __tests__/test1.spec.js (65 MB heap size)
+ PASS  __tests__/test15.spec.js (39 MB heap size)
+ PASS  __tests__/test3.spec.js (47 MB heap size)
+
+Test Suites: 25 passed, 25 total
+Tests:       25 passed, 25 total
+Snapshots:   0 total
+Time:        1.636s, estimated 2s
+Ran all test suites.
+```
+
+As you can see there is NO steady heap usage increase

__tests__/test1.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test10.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test11.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test12.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test13.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test14.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test15.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test16.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test17.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test18.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test19.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test2.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test20.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test21.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test22.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test23.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test24.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test25.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test3.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test4.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test5.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test6.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test7.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test8.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

__tests__/test9.spec.js

@@ -0,0 +1,5 @@
+describe('describe', () => {
+    test('test', () => {
+        expect(true).toBe(true);
+    });
+});

jest.config.js

@@ -0,0 +1,3 @@
+module.exports = {
+    setupTestFrameworkScriptFile: require.resolve('./setupJest'),
+};