Mock component method

[harshvirani911]

Hi @egil ,How to mock component method?

Component:

public partial class DemoTemplate{
public async Task ValidateDemoAsync(string DemoKey){
if(DemoKey == "1"){return true;}
else{
return false;
}
}
}

For above i need to mock ValidateDemoAsync, how can we do?

[egil]

@harshvirani911, to mock a method in any a component (and for that matter in any class), you need to mock the component/class itself.

Here is the general approach:

1. Create a mock of the component you want to mock a method in, using a mocking library.
2. Set up how the mocking of the method on the mocked component.
3. Configure bUnit to use the mocked component instead of the real component during rendering.

Step 1 and 2 depends on the mocking framework you use. For that, I refer you to the frameworks documentation. For step 3, see this bUnit doc page: https://bunit.dev/docs/providing-input/substituting-components.html#creating-a-mock-component-with-mocking-libraries

[egil]

The error you are quoting doesn't sound like it is coming from bUnit.

You can probably see that if you change the code like this:

var mock = DemoTemplateMock();
TestContext.ComponentFactories.Add(mock.Object);

Normally methods that you want to mock needs to be virtual. Try that.

[harshvirani911]

now i have made component method virtual still getting non generic method 'componentfactorycollection.add(icomponentfactory)' can not be used with type arguments'
error

public partial class DemoTemplate{
public virtual async Task ValidateDemoAsync(string DemoKey){
if(DemoKey == "1"){return true;}
else{
return false;
}
}
}

[egil]

Is your code actually compiling?

If yes, post it exactly as you have it.

[harshvirani911]

Component:

public partial class DemoTemplate{
public virtual async Task ValidateDemoAsync(string DemoKey){
if(DemoKey == "1"){return true;}
else{
return false;
}
}
}

test code:
public class DemoTemplateTest: TestContextWrapper
{
IRenderedComponent _DemoComponent;
[SetUp]
public void SetUp(){
Mock DemoTemplateMock = new Mock();
DemoTemplateMock.Setup(x => x.ValidateDemoAsync(It.IsAny())).ReturnsAsync((string Demokey)=> {
if (!string.IsNullOrEmpty(Demokey)) { return true; }
else { return false; }
});
TestContext.ComponentFactories.Add(DemoTemplateMock .Object)
}
[Test]
public void testData(){
_DemoComponent = RenderComponent();
Assert.AreEqual(_DemoComponent.FindAll("td span")[2].TextContent, Convert.ToString(true));
}
}

[egil]

What is the output when you run that code?

(ps. also please apply code formatting and styling. see how to here: https://docs.github.com/en/github/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax)