feat(assertions): add WasCalled to tunit mocks assertions

TUnit.Mocks.Assertions/MockAssertionExtensions.cs

@@ -1,5 +1,7 @@
 using System.Runtime.CompilerServices;
+using TUnit.Assertions.Attributes;
 using TUnit.Assertions.Core;
+using TUnit.Mocks.Exceptions;
 using TUnit.Mocks.Verification;
 
 namespace TUnit.Mocks.Assertions;
@@ -10,6 +12,29 @@ namespace TUnit.Mocks.Assertions;
 /// </summary>
 public static class MockAssertionExtensions
 {
+    /// <summary>
+    /// Asserts that the mock member was called at least once.
+    /// Generates the <c>WasCalled()</c> assertion on <see cref="IAssertionSource{ICallVerification}"/>.
+    /// </summary>
+    [GenerateAssertion(ExpectationMessage = "to have been called")]
+    public static AssertionResult WasCalled(ICallVerification verification)
+    {
+        if (verification is null)
+        {
+            return AssertionResult.Failed("Verification target is null");
+        }
+
+        try
+        {
+            verification.WasCalled();
+            return AssertionResult.Passed;
+        }
+        catch (MockVerificationException ex)
+        {
+            return AssertionResult.Failed(ex.Message);
+        }
+    }
+
     /// <summary>
     /// Asserts that the mock member was called the specified number of times.
     /// </summary>

TUnit.Mocks.Assertions/TUnit.Mocks.Assertions.csproj

@@ -9,6 +9,7 @@
     <ItemGroup>
         <ProjectReference Include="..\TUnit.Mocks\TUnit.Mocks.csproj" />
         <ProjectReference Include="..\TUnit.Assertions\TUnit.Assertions.csproj" />
+        <ProjectReference Include="..\TUnit.Assertions.SourceGenerator\TUnit.Assertions.SourceGenerator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
     </ItemGroup>
 
     <Import Project="..\Library.targets" />

TUnit.Mocks.Tests/AsyncVerificationTests.cs

@@ -84,6 +84,30 @@ await Assert.That(mock.Add(Any(), Any()))
             .WasCalled(Times.AtLeastOnce);
     }
 
+    [Test]
+    public async Task WasCalled_AtLeastOnceByDefault_Passes()
+    {
+        var mock = ICalculator.Mock();
+        mock.Add(Any(), Any()).Returns(42);
+
+        ICalculator calc = mock.Object;
+        _ = calc.Add(1, 2);
+        _ = calc.Add(3, 4);
+
+        await Assert.That(mock.Add(Any(), Any()))
+            .WasCalled();
+    }
+
+    [Test]
+    public async Task WasCalled_Default_Fails_When_Not_Called()
+    {
+        var mock = ICalculator.Mock();
+
+        await Assert.ThrowsAsync(async () =>
+            await Assert.That(mock.Add(Any(), Any()))
+                .WasCalled());
+    }
+
     [Test]
     public async Task Property_Getter_WasCalled_Via_Assert()
     {