public async Task CreatedAtRouteResult_ReturnsStatusCode_SetsLocationHeader(object values)
    {
        // Arrange
        var expectedUrl = "testAction";
        var httpContext = GetHttpContext(expectedUrl);

        // Act
        var result = new CreatedAtRouteResult(routeName: null, routeValues: values, value: null);
        await result.ExecuteAsync(httpContext);

        // Assert
        Assert.Equal(StatusCodes.Status201Created, httpContext.Response.StatusCode);
        Assert.Equal(expectedUrl, httpContext.Response.Headers["Location"]);
    }
    public async Task CreatedAtRouteResult_ThrowsOnNullUrl()
    {
        // Arrange
        var httpContext = GetHttpContext(expectedUrl: null);

        var result = new CreatedAtRouteResult(
            routeName: null,
            routeValues: new Dictionary <string, object>(),
            value: null);

        // Act & Assert
        await ExceptionAssert.ThrowsAsync <InvalidOperationException>(
            async() => await result.ExecuteAsync(httpContext),
            "No route matches the supplied values.");
    }