NSubstitute ILogger .NET Core

NSubstitute ILogger .NET Core

To use NSubstitute with ILogger in .NET Core, you can create a test logger and use that to substitute the ILogger interface.

Here is an example of how to do this:

using NSubstitute; using Microsoft.Extensions.Logging; public class MyTest { private readonly ILogger<MyService> _logger; public MyTest() { _logger = Substitute.For<ILogger<MyService>>(); } [Fact] public void MyService_LogsInformation_WhenMethodIsCalled() { // Arrange var myService = new MyService(_logger); // Act myService.DoSomething(); // Assert _logger.Received().Log( LogLevel.Information, Arg.Any<EventId>(), Arg.Is<object>(o => o.ToString().Contains("Something happened")), null, Arg.Any<Func<object, Exception, string>>() ); } }

In this example, we create a test logger for the MyService class by using Substitute.For<ILogger<MyService>>(). This creates a fake logger that can be used in tests.

We then inject the fake logger into the MyService class and call the DoSomething() method. Finally, we use NSubstitute's Received() method to assert that the logger was called with the expected log level, message, and other arguments.

Examples

  1. "NSubstitute ILogger .NET Core example"

    • Description: Find examples demonstrating how to use NSubstitute to mock an ILogger in .NET Core for unit testing.
    // Example code for NSubstitute ILogger in .NET Core var logger = Substitute.For<ILogger<MyClass>>();

  2. "NSubstitute ILogger Log method verification"

    • Description: Learn how to verify calls to the Log method on NSubstitute's ILogger in .NET Core.
    // Example code for NSubstitute ILogger Log method verification logger.Received().Log(LogLevel.Information, Arg.Any<EventId>(), Arg.Any<object>(), Arg.Any<Exception>(), Arg.Any<Func<object, Exception, string>>());

  3. "NSubstitute ILogger LogLevel verification"

    • Description: Explore examples of how to verify that an ILogger in .NET Core is called with a specific LogLevel.
    // Example code for NSubstitute ILogger LogLevel verification logger.Received().Log(LogLevel.Error, Arg.Any<EventId>(), Arg.Any<object>(), Arg.Any<Exception>(), Arg.Any<Func<object, Exception, string>>());

  4. "NSubstitute ILogger LogCritical method example"

    • Description: Find examples demonstrating how to use NSubstitute to mock the LogCritical method on ILogger in .NET Core.
    // Example code for NSubstitute ILogger LogCritical method mocking logger.LogCritical("Critical message");

  5. "NSubstitute ILogger LogError method example"

    • Description: Explore examples of using NSubstitute to mock the LogError method on ILogger in .NET Core.
    // Example code for NSubstitute ILogger LogError method mocking logger.LogError("Error message");

  6. "NSubstitute ILogger LogWarning method example"

    • Description: Learn how to use NSubstitute to mock the LogWarning method on ILogger in .NET Core.
    // Example code for NSubstitute ILogger LogWarning method mocking logger.LogWarning("Warning message");

  7. "NSubstitute ILogger LogInformation method example"

    • Description: Explore examples of using NSubstitute to mock the LogInformation method on ILogger in .NET Core.
    // Example code for NSubstitute ILogger LogInformation method mocking logger.LogInformation("Information message");

  8. "NSubstitute ILogger LogDebug method example"

    • Description: Find examples demonstrating how to use NSubstitute to mock the LogDebug method on ILogger in .NET Core.
    // Example code for NSubstitute ILogger LogDebug method mocking logger.LogDebug("Debug message");

  9. "NSubstitute ILogger LogTrace method example"

    • Description: Learn how to use NSubstitute to mock the LogTrace method on ILogger in .NET Core.
    // Example code for NSubstitute ILogger LogTrace method mocking logger.LogTrace("Trace message");

  10. "NSubstitute ILogger logging context example"

    • Description: Explore examples of how to use NSubstitute to mock ILogger and test logging with a specific logging context in .NET Core.
    // Example code for NSubstitute ILogger logging context testing using (logger.BeginScope("ScopeValue")) { logger.LogInformation("Log message within scope"); }

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