From ff6b514a7b1087e7e5f363305cce46b513a3e562 Mon Sep 17 00:00:00 2001
From: Yoshiya Hinosawa <stibium121@gmail.com>
Date: Wed, 18 Dec 2019 22:05:58 +0900
Subject: Improve empty test case error messages (#3514)

---
 std/testing/mod.ts | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

(limited to 'std/testing/mod.ts')

diff --git a/std/testing/mod.ts b/std/testing/mod.ts
index 3b6386d5b..0d5d2702a 100644
--- a/std/testing/mod.ts
+++ b/std/testing/mod.ts
@@ -10,6 +10,7 @@ import {
   yellow,
   italic
 } from "../fmt/colors.ts";
+import { assert } from "./asserts.ts";
 export type TestFunction = () => void | Promise<void>;
 
 export interface TestDefinition {
@@ -121,14 +122,28 @@ export function test(
       throw new Error("Missing test function");
     }
     name = t;
+    if (!name) {
+      throw new Error("The name of test case can't be empty");
+    }
+  } else if (typeof t === "function") {
+    fn = t;
+    name = t.name;
+    if (!name) {
+      throw new Error("Test function can't be anonymous");
+    }
   } else {
-    fn = typeof t === "function" ? t : t.fn;
+    fn = t.fn;
+    if (!fn) {
+      throw new Error("Missing test function");
+    }
     name = t.name;
+    if (!name) {
+      throw new Error("The name of test case can't be empty");
+    }
   }
+  assert(!!name, "The name of test case shouldn't be empty");
+  assert(!!fn, "Test function shouldn't be empty");
 
-  if (!name) {
-    throw new Error("Test function may not be anonymous");
-  }
   if (filter(name)) {
     candidates.push({ fn, name });
   } else {
-- 
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