source/group.ts

@@ -4,32 +4,23 @@ import {type Result, Test, TestContext} from "./test.js";
 export async function setup(
   name: string,
   fn: (group: Group) => Promise<void>,
-  options?: GroupOptions,
 ): Promise<Group> {
-  const group = new Group(name, options);
+  const group = new Group(name);
   await fn(group);
   await group.run();
   return group;
 }
 
-/** Options for test groups. */
-export type GroupOptions = {
-  parallel?: boolean;
-};
-
 /** A collection of tests. */
-export class Group implements GroupOptions {
+export class Group {
   public context: TestContext = new TestContext();
-  public parallel: boolean;
   public results: Result[] = [];
   public tests: Test[] = [];
 
   private _afterAll: (() => Promise<void>) | undefined;
   private _beforeAll: (() => Promise<void>) | undefined;
 
-  constructor(public name: string, options?: GroupOptions) {
+  constructor(public name: string) {}
-    this.parallel = options?.parallel ?? false;
-  }
 
   /** Set a function to run after all tests have finished. */
   afterAll(fn: Group["_afterAll"]): void {
@@ -57,18 +48,9 @@ export class Group implements GroupOptions {
       await this._beforeAll();
     }
 
-    let results: Result[];
+    const results = await Promise.all(
-    if (this.parallel) {
-      results = await Promise.all(
       this.tests.map(async (test) => test.run(this.context)),
     );
-    } else {
-      results = [];
-      for (const test of this.tests) {
-        // eslint-disable-next-line no-await-in-loop
-        results.push(await test.run(this.context));
-      }
-    }
 
     if (this._afterAll !== undefined) {
       await this._afterAll();

source/test.ts

@@ -1,31 +1,24 @@
 export class AssertionError extends Error {
   public readonly actual: string;
   public readonly expected: string;
-  public readonly title: string | undefined;
 
-  constructor(message: string, actual: any, expected: any, title?: string) {
+  constructor(message: string, actual: any, expected: any) {
     super(message);
 
     this.actual = JSON.stringify(actual);
     this.expected = JSON.stringify(expected);
-    this.title = title;
   }
 }
 
 /** Test execution context with assertions. */
 export class TestContext {
   /** Assert strict equality with `===`. */
-  equals<T>(actual: T, expected: T, title?: string): void {
+  equals<T>(actual: T, expected: T): void {
     if (actual === expected) {
       return;
     }
 
-    throw new AssertionError(
+    throw new AssertionError("Failed equals assertion", actual, expected);
-      "Failed equals assertion",
-      actual,
-      expected,
-      title,
-    );
   }
 }
 
@@ -127,7 +120,6 @@ export class Result implements ResultData {
 
     if (this.error !== undefined) {
       message += `\n  %c${this.error.message}`;
-      message += this.error.title === undefined ? "" : `: ${this.error.title}`;
       message += `\n  |   Actual: ${this.error.actual}`;
       message += `\n  | Expected: ${this.error.expected}`;
       styles.push("color: pink;");

tests/index.ts

@@ -34,9 +34,7 @@ void setup("add", async (group) => {
   });
 });
 
-void setup(
+void setup("subtract", async (group) => {
-  "subtract",
-  async (group) => {
   group.beforeAll(async () => {
     console.log("subtract beforeAll hook");
   });
@@ -54,10 +52,6 @@ void setup(
   });
 
   group.test("subtract(1, 1) = 2", async (test) => {
-      test.equals(await subtract(1, 1), 2, "extra title");
+    test.equals(await subtract(1, 1), 2);
   });
-  },
+});
-  {
-    parallel: false,
-  },
-);