Moq1400.md

Moq1400: Explicitly choose a mocking behavior instead of relying on the default (Loose) behavior

Item	Value
Enabled	True
Severity	Warning
CodeFix	False

---

Mocks use the MockBehavior.Loose by default. Some people find this default behavior undesirable, as it can lead to unexpected behavior if the mock is improperly set up. To fix, specify either MockBehavior.Loose or MockBehavior.Strict to signify acknowledgement of the mock's behavior.

Examples of patterns that are flagged by this analyzer

interface ISample
{
    int Calculate() => 0;
}

var mock = new Mock<ISample>(); // Moq1400: Moq: Explicitly choose a mock behavior
var mock2 = Mock.Of<ISample>();  // Moq1400: Moq: Explicitly choose a mock behavior

interface ISample
{
    int Calculate() => 0;
}

var mock = new Mock<ISample>(MockBehavior.Default); // Moq1400: Moq: Explicitly choose a mock behavior
var mock2 = Mock.Of<ISample>(MockBehavior.Default); // Moq1400: Moq: Explicitly choose a mock behavior
var repo = new MockRepository(MockBehavior.Default); // Moq1400: Moq: Explicitly choose a mock behavior

Solution

interface ISample
{
    int Calculate() => 0;
}

var mock = new Mock<ISample>(MockBehavior.Strict); // Or `MockBehavior.Loose`
var mock2 = new Mock.Of<ISample>(MockBehavior.Strict); // Or `MockBehavior.Loose`
var repo = new MockRepository(MockBehavior.Strict); // Or `MockBehavior.Loose`

Suppress a warning

If you just want to suppress a single violation, add preprocessor directives to your source file to disable and then re-enable the rule.

#pragma warning disable Moq1400
var mock = new Mock<ISample>(); // Moq1400: Moq: Explicitly choose a mock behavior
#pragma warning restore Moq1400

To disable the rule for a file, folder, or project, set its severity to none in the configuration file.

[*.{cs,vb}]
dotnet_diagnostic.Moq1400.severity = none

For more information, see How to suppress code analysis warnings.