Unit test case - Pass and fetch a value from a query string parameter

Question

I am using .NET Core. I want to pass value from query string parameter from unit test function to the azure function. I am facing issue with passing and accessing the query string parameter value.

The URL is https://localhost:4300/api/RolePageMapping?EnterpriseId=xyz

I want to use the query string parameter inside Azure function. The code is as below.

 public static async Task<HttpResponseMessage> Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = null)] HttpRequest req,
            ILogger log)
        {
                                             
                string EnterpriseId = req.Query["EnterpriseId"];
        }

I want to know how can I pass the value from my unit test function to Azure function?

[Fact]
public async Task Function_ReturnBadRequest()
{
    var request = new Mock<HttpRequest>();

    var logger = new MockLogger();

    var actualResult = await
    GetUserRolePageMapping.Run(request.Object, logger);
    actualResult.Should().BeOfType<HttpResponseMessage>();
}

Answer 1

You would need to mock the HttpRequest.Query Property of the HttpRequest

[Fact]
public async Task Function_ReturnBadRequest() {
    //Arrange
    var expectedValue = new StringValues("Hello World"); //Or what you want
    var request = new Mock<HttpRequest>();
    request
        .Setup(_ => _.Query["EnterpriseId"])
        .Returns(expectedValue);

    var logger = new MockLogger();

    //Act
    var actualResult = await GetUserRolePageMapping.Run(request.Object, logger);

    //Assert
    actualResult.Should().BeOfType<HttpResponseMessage>();
}

Answer 2

To build more complex query strings we can use QueryCollection class. It's a little bit unconveniet beast but it has everything we need to build up query strings from values we have.

Building query string using QueryCollection class needs three steps:

• Create instance of StringValues class. It's a class that takes either string or array of strings to its constructor. This class holds values for query string parameter.

• Create Dictionary<string,StringValues> for query parameters. Add query parameter name and instance of StringValues to dictionary. Repeat it for all query parameters.

• Create instance of QueryCollection and use dictionary as contructor argument.

   [Fact] public async Task ViewPdf_returns_view_if_document_exists_and_html_was_asked()

  {

   var model = new ApplicationReviewModel(); var dictionary = new Dictionary<string, StringValues>(); dictionary.Add("showhtml", new StringValues("1")); dictionary.Add("showtoc", new StringValues("0")); _controller.Request.Query = new QueryCollection(dictionary); _applicationServiceMock.Setup(a => a.GetDocumentReview(It.IsAny<Guid>(), It.IsAny<string>())) .ReturnsAsync(() => model); var result = await _controller.ViewPdf(Guid.NewGuid()) as ViewResult; Assert.Same(model, result.Model); Assert.Equal("ApplicationPdf", result.ViewName);

  }