feat: add overloaded form of unit test declaration (denoland/deno_std#563)

Original: https://github.com/denoland/deno_std/commit/bd146e0188dbd2c4a802e0af6e6b0705675c4abb

2 files changed, 23 insertions, 3 deletions

diff --git a/testing/mod.ts b/testing/mod.ts
index 462c13fb1..fa6fda246 100644
--- a/testing/mod.ts
+++ b/testing/mod.ts
@@ -86,9 +86,24 @@ function filter(name: string): boolean {
   }
 }
 
-export function test(t: TestDefinition | TestFunction): void {
-  const fn: TestFunction = typeof t === "function" ? t : t.fn;
-  const name: string = t.name;
+export function test(t: TestDefinition): void;
+export function test(fn: TestFunction): void;
+export function test(name: string, fn: TestFunction): void;
+export function test(
+  t: string | TestDefinition | TestFunction,
+  fn?: TestFunction
+): void {
+  let name: string;
+
+  if (typeof t === "string") {
+    if (!fn) {
+      throw new Error("Missing test function");
+    }
+    name = t;
+  } else {
+    fn = typeof t === "function" ? t : t.fn;
+    name = t.name;
+  }
 
   if (!name) {
     throw new Error("Test function may not be anonymous");
diff --git a/testing/test.ts b/testing/test.ts
index 8c86791ba..3a35be1e9 100644
--- a/testing/test.ts
+++ b/testing/test.ts
@@ -263,4 +263,9 @@ test(async function testingThrowsAsyncMsgNotIncludes(): Promise<void> {
   assert(didThrow);
 });
 
+test("test fn overloading", (): void => {
+  // just verifying that you can use this test definition syntax
+  assert(true);
+});
+
 runIfMain(import.meta);