Function fn

assert/instance_of_test.ts:6–115

()

Deno.test({
  name: "assertInstanceOf",
  fn() {
    class TestClass1 {}
    class TestClass2 {}
    class TestClass3 {}

    // Regular types
    assertInstanceOf(new Date(), Date);
    assertInstanceOf(new Number(), Number);
    assertInstanceOf(Promise.resolve(), Promise);
    assertInstanceOf(new TestClass1(), TestClass1);

    // Throwing cases
    assertThrows(
      () => assertInstanceOf(new Date(), RegExp),
      AssertionError,
      `Expected object to be an instance of "RegExp" but was "Date".`,
    );
    assertThrows(
      () => assertInstanceOf(5, Date),
      AssertionError,
      `Expected object to be an instance of "Date" but was "number".`,
    );
    assertThrows(
      () => assertInstanceOf(new TestClass1(), TestClass2),
      AssertionError,
      `Expected object to be an instance of "TestClass2" but was "TestClass1".`,
    );

    // Custom message
    assertThrows(
      () => assertInstanceOf(new Date(), RegExp, "CUSTOM MESSAGE"),
      AssertionError,
      "CUSTOM MESSAGE",
    );

    // Edge cases
    assertThrows(
      () => assertInstanceOf(5, Number),
      AssertionError,
      `Expected object to be an instance of "Number" but was "number".`,
    );

    let TestClassWithSameName: new () => unknown;
    {
      class TestClass3 {}
      TestClassWithSameName = TestClass3;
    }
    assertThrows(
      () => assertInstanceOf(new TestClassWithSameName(), TestClass3),
      AssertionError,
      `Expected object to be an instance of "TestClass3".`,
    );

    assertThrows(
      () => assertInstanceOf(TestClass1, TestClass1),
      AssertionError,
      `Expected object to be an instance of "TestClass1" but was not an instanced object.`,
    );