1 files changed, 154 insertions, 0 deletions
diff --git a/tests/unit/testing_test.ts b/tests/unit/testing_test.ts
new file mode 100644
index 000000000..e04ab921c
--- /dev/null
+++ b/tests/unit/testing_test.ts
@@ -0,0 +1,154 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+import { assertEquals, assertRejects, assertThrows } from "./test_util.ts";
+
+Deno.test(function testWrongOverloads() {
+  assertThrows(
+    () => {
+      // @ts-ignore Testing invalid overloads
+      Deno.test("some name", { fn: () => {} }, () => {});
+    },
+    TypeError,
+    "Unexpected 'fn' field in options, test function is already provided as the third argument.",
+  );
+  assertThrows(
+    () => {
+      // @ts-ignore Testing invalid overloads
+      Deno.test("some name", { name: "some name2" }, () => {});
+    },
+    TypeError,
+    "Unexpected 'name' field in options, test name is already provided as the first argument.",
+  );
+  assertThrows(
+    () => {
+      // @ts-ignore Testing invalid overloads
+      Deno.test(() => {});
+    },
+    TypeError,
+    "The test function must have a name",
+  );
+  assertThrows(
+    () => {
+      // @ts-ignore Testing invalid overloads
+      Deno.test(function foo() {}, {});
+    },
+    TypeError,
+    "Unexpected second argument to Deno.test()",
+  );
+  assertThrows(
+    () => {
+      // @ts-ignore Testing invalid overloads
+      Deno.test({ fn: () => {} }, function foo() {});
+    },
+    TypeError,
+    "Unexpected 'fn' field in options, test function is already provided as the second argument.",
+  );
+  assertThrows(
+    () => {
+      // @ts-ignore Testing invalid overloads
+      Deno.test({});
+    },
+    TypeError,
+    "Expected 'fn' field in the first argument to be a test function.",
+  );
+  assertThrows(
+    () => {
+      // @ts-ignore Testing invalid overloads
+      Deno.test({ fn: "boo!" });
+    },
+    TypeError,
+    "Expected 'fn' field in the first argument to be a test function.",
+  );
+});
+
+Deno.test(function nameOfTestCaseCantBeEmpty() {
+  assertThrows(
+    () => {
+      Deno.test("", () => {});
+    },
+    TypeError,
+    "The test name can't be empty",
+  );
+  assertThrows(
+    () => {
+      Deno.test({
+        name: "",
+        fn: () => {},
+      });
+    },
+    TypeError,
+    "The test name can't be empty",
+  );
+});
+
+Deno.test(async function invalidStepArguments(t) {
+  await assertRejects(
+    async () => {
+      // deno-lint-ignore no-explicit-any
+      await (t as any).step("test");
+    },
+    TypeError,
+    "Expected function for second argument.",
+  );
+
+  await assertRejects(
+    async () => {
+      // deno-lint-ignore no-explicit-any
+      await (t as any).step("test", "not a function");
+    },
+    TypeError,
+    "Expected function for second argument.",
+  );
+
+  await assertRejects(
+    async () => {
+      // deno-lint-ignore no-explicit-any
+      await (t as any).step();
+    },
+    TypeError,
+    "Expected a test definition or name and function.",
+  );
+
+  await assertRejects(
+    async () => {
+      // deno-lint-ignore no-explicit-any
+      await (t as any).step(() => {});
+    },
+    TypeError,
+    "The step function must have a name.",
+  );
+});
+
+Deno.test(async function nameOnTextContext(t1) {
+  await assertEquals(t1.name, "nameOnTextContext");
+  await t1.step("step", async (t2) => {
+    await assertEquals(t2.name, "step");
+    await t2.step("nested step", async (t3) => {
+      await assertEquals(t3.name, "nested step");
+    });
+  });
+});
+
+Deno.test(async function originOnTextContext(t1) {
+  await assertEquals(t1.origin, Deno.mainModule);
+  await t1.step("step", async (t2) => {
+    await assertEquals(t2.origin, Deno.mainModule);
+    await t2.step("nested step", async (t3) => {
+      await assertEquals(t3.origin, Deno.mainModule);
+    });
+  });
+});
+
+Deno.test(async function parentOnTextContext(t1) {
+  await assertEquals(t1.parent, undefined);
+  await t1.step("step", async (t2) => {
+    await assertEquals(t1, t2.parent);
+    await t2.step("nested step", async (t3) => {
+      await assertEquals(t2, t3.parent);
+    });
+  });
+});
+
+Deno.test("explicit undefined for boolean options", {
+  ignore: undefined,
+  only: undefined,
+}, () => {});