jest marbles

Author: code0wl

jest.config.js

@@ -0,0 +1,17 @@
+module.exports = {
+    "roots": [
+        "<rootDir>/src"
+    ],
+    "transform": {
+        "^.+\\.tsx?$": "ts-jest"
+    },
+    "testRegex": "(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$",
+    "moduleFileExtensions": [
+        "ts",
+        "tsx",
+        "js",
+        "jsx",
+        "json",
+        "node"
+    ],
+}

main.spec.ts

@@ -0,0 +1,18 @@
+import { marbles } from "rxjs-marbles/mocha";
+import { map } from "rxjs/operators";
+
+describe("rxjs-marbles", () => {
+
+    it("should support marble tests", marbles(m => {
+
+        const source =  m.hot("--^-a-b-c-|");
+        const subs =            "^-------!";
+        const expected =        "--b-c-d-|";
+
+        const destination = source.pipe(
+            map(value => String.fromCharCode(value.charCodeAt(0) + 1))
+        );
+        m.expect(destination).toBeObservable(expected);
+        m.expect(source).toHaveSubscriptions(subs);
+    }));
+});