Verification

Verify that methods were invoked the expected number of times with specific arguments. Use Called(Count.*) on the method builder.

Target type used in examples:

Example

using Imposter.Abstractions;

[assembly: GenerateImposter(typeof(Imposter.Tests.Docs.Methods.IVerifyService))]

public interface IVerifyService
{
    void Increment(int v);
    int Combine(int a, int b);
}

Basic counts

Example

service.Increment(1);
service.Increment(2);

imposter.Increment(Arg<int>.Any()).Called(Count.AtLeast(2));
imposter.Increment(2).Called(Count.Once());

Matching arguments

Verification respects the same argument matching rules used for arrangements:

Example

// See more examples in repo tests
imposter.Increment(Arg<int>.Is(x => x > 10)).Called(Count.Exactly(3));
imposter.Combine(Arg<int>.Is(x => x > 0), Arg<int>.Is(y => y < 10)).Called(Count.Once());

Failures

When verification fails, VerificationFailedException is thrown. The message includes both the expected/actual counts and, when available, a textual list of performed invocations:

Invocation was expected to be performed {expectedCount} but instead was performed {actualCount} times.
Performed invocations:
{invocation1}
{invocation2}
...

Use this list to quickly see which calls were actually made and why the verification did not match your expectations.