Overview of implemented NUnit diagnostics and code fixes
In the tables below we use the following symbols:
- 🔍 - whether the diagnostic is enabled by default or not
- 📝 - the severity of the diagnostic
- 💡 - whether the diagnostic has an associated code fix or not
The severity of a diagnostic can the one of the following (in increasing severity):
- 💭 - indicates a severity of Hidden
- ℹ️ - indicates a severity of Info
- ⚠️ - indicates a severity of Warning
- ❗ - indicates a severity of Error
Structure Rules (NUnit1001 - )
Rules which enforce structural requirements on the test code.
| Id | Title | 🔍 | 📝 | 💡 |
|---|---|---|---|---|
| NUnit1001 | The individual arguments provided by a TestCaseAttribute must match the type of the corresponding parameter of the method. | ✅ | ❗ | ❌ |
| NUnit1002 | The TestCaseSource should use nameof operator to specify target. | ✅ | ⚠️ | ✅ |
| NUnit1003 | The TestCaseAttribute provided too few arguments. | ✅ | ❗ | ❌ |
| NUnit1004 | The TestCaseAttribute provided too many arguments. | ✅ | ❗ | ❌ |
| NUnit1005 | The type of the value specified via ExpectedResult must match the return type of the method. | ✅ | ❗ | ❌ |
| NUnit1006 | ExpectedResult must not be specified when the method returns void. | ✅ | ❗ | ❌ |
| NUnit1007 | The method has non-void return type, but no result is expected in ExpectedResult. | ✅ | ❗ | ❌ |
| NUnit1008 | Specifying ParallelScope.Self on assembly level has no effect. | ✅ | ⚠️ | ❌ |
| NUnit1009 | One may not specify ParallelScope.Children on a non-parameterized test method. | ✅ | ❗ | ❌ |
| NUnit1010 | One may not specify ParallelScope.Fixtures on a test method. | ✅ | ❗ | ❌ |
| NUnit1011 | The TestCaseSource argument does not specify an existing member. | ✅ | ❗ | ❌ |
| NUnit1012 | The async test method must have a non-void return type. | ✅ | ❗ | ❌ |
| NUnit1013 | The async test method must have a non-generic Task return type when no result is expected. | ✅ | ❗ | ❌ |
| NUnit1014 | The async test method must have a Task<T> return type when a result is expected. | ✅ | ❗ | ❌ |
| NUnit1015 | The source type does not implement IEnumerable. | ✅ | ❗ | ❌ |
| NUnit1016 | The source type does not have a default constructor. | ✅ | ❗ | ❌ |
| NUnit1017 | The specified source is not static. | ✅ | ❗ | ❌ |
| NUnit1018 | The number of parameters provided by the TestCaseSource does not match the number of parameters in the target method. | ✅ | ❗ | ❌ |
| NUnit1019 | The source specified by the TestCaseSource does not return an IEnumerable or a type that implements IEnumerable. | ✅ | ❗ | ❌ |
| NUnit1020 | The TestCaseSource provides parameters to a source - field or property - that expects no parameters. | ✅ | ❗ | ❌ |
| NUnit1021 | The ValueSource should use nameof operator to specify target. | ✅ | ⚠️ | ✅ |
| NUnit1022 | The specified source is not static. | ✅ | ❗ | ❌ |
| NUnit1023 | The target method expects parameters which cannot be supplied by the ValueSource. | ✅ | ❗ | ❌ |
| NUnit1024 | The source specified by the ValueSource does not return an IEnumerable or a type that implements IEnumerable. | ✅ | ❗ | ❌ |
| NUnit1025 | The ValueSource argument does not specify an existing member. | ✅ | ❗ | ❌ |
| NUnit1026 | The test or setup/teardown method is not public. | ✅ | ❗ | ✅ |
| NUnit1027 | The test method has parameters, but no arguments are supplied by attributes. | ✅ | ❗ | ❌ |
| NUnit1028 | The non-test method is public. | ✅ | ℹ️ | ✅ |
Assertion Rules (NUnit2001 - )
Rules which improve assertions in the test code.
| Id | Title | 🔍 | 📝 | 💡 |
|---|---|---|---|---|
| NUnit2001 | Consider using Assert.That(expr, Is.False) instead of Assert.False(expr). | ✅ | ℹ️ | ✅ |
| NUnit2002 | Consider using Assert.That(expr, Is.False) instead of Assert.IsFalse(expr). | ✅ | ℹ️ | ✅ |
| NUnit2003 | Consider using Assert.That(expr, Is.True) instead of Assert.IsTrue(expr). | ✅ | ℹ️ | ✅ |
| NUnit2004 | Consider using Assert.That(expr, Is.True) instead of Assert.True(expr). | ✅ | ℹ️ | ✅ |
| NUnit2005 | Consider using Assert.That(actual, Is.EqualTo(expected)) instead of Assert.AreEqual(expected, actual). | ✅ | ⚠️ | ✅ |
| NUnit2006 | Consider using Assert.That(actual, Is.Not.EqualTo(expected)) instead of Assert.AreNotEqual(expected, actual). | ✅ | ⚠️ | ✅ |
| NUnit2007 | The actual value should not be a constant. | ✅ | ⚠️ | ✅ |
| NUnit2008 | Incorrect IgnoreCase usage. | ✅ | ⚠️ | ❌ |
| NUnit2009 | The same value has been provided as both the actual and the expected argument. | ✅ | ⚠️ | ❌ |
| NUnit2010 | Use EqualConstraint for better assertion messages in case of failure. | ✅ | ℹ️ | ✅ |
| NUnit2011 | Use ContainsConstraint for better assertion messages in case of failure. | ✅ | ℹ️ | ✅ |
| NUnit2012 | Use StartsWithConstraint for better assertion messages in case of failure. | ✅ | ℹ️ | ✅ |
| NUnit2013 | Use EndsWithConstraint for better assertion messages in case of failure. | ✅ | ℹ️ | ✅ |
| NUnit2014 | Use SomeItemsConstraint for better assertion messages in case of failure. | ✅ | ℹ️ | ✅ |
| NUnit2015 | Consider using Assert.That(actual, Is.SameAs(expected)) instead of Assert.AreSame(expected, actual). | ✅ | ⚠️ | ✅ |
| NUnit2016 | Consider using Assert.That(expr, Is.Null) instead of Assert.Null(expr). | ✅ | ℹ️ | ✅ |
| NUnit2017 | Consider using Assert.That(expr, Is.Null) instead of Assert.IsNull(expr). | ✅ | ℹ️ | ✅ |
| NUnit2018 | Consider using Assert.That(expr, Is.Not.Null) instead of Assert.NotNull(expr). | ✅ | ℹ️ | ✅ |
| NUnit2019 | Consider using Assert.That(expr, Is.Not.Null) instead of Assert.IsNotNull(expr). | ✅ | ℹ️ | ✅ |
| NUnit2020 | Incompatible types for SameAs constraint. | ✅ | ❗ | ❌ |
| NUnit2021 | Incompatible types for EqualTo constraint. | ✅ | ❗ | ❌ |
| NUnit2022 | Missing property required for constraint. | ✅ | ❗ | ✅ |
| NUnit2023 | Invalid NullConstraint usage. | ✅ | ❗ | ❌ |
| NUnit2024 | Wrong actual type used with String Constraint. | ✅ | ❗ | ❌ |
| NUnit2025 | Wrong actual type used with ContainsConstraint. | ✅ | ❗ | ❌ |
| NUnit2026 | Wrong actual type used with the SomeItemsConstraint with EqualConstraint. | ✅ | ❗ | ❌ |
| NUnit2027 | Consider using Assert.That(actual, Is.GreaterThan(expected)) instead of Assert.Greater(actual, expected). | ✅ | ℹ️ | ✅ |
| NUnit2028 | Consider using Assert.That(actual, Is.GreaterThanOrEqualTo(expected)) instead of Assert.GreaterOrEqual(actual, expected). | ✅ | ℹ️ | ✅ |
| NUnit2029 | Consider using Assert.That(actual, Is.LessThan(expected)) instead of Assert.Less(actual, expected). | ✅ | ℹ️ | ✅ |
| NUnit2030 | Consider using Assert.That(actual, Is.LessThanOrEqualTo(expected)) instead of Assert.LessOrEqual(actual, expected). | ✅ | ℹ️ | ✅ |
| NUnit2031 | Consider using Assert.That(actual, Is.Not.SameAs(expected)) instead of Assert.AreNotSame(expected, actual). | ✅ | ⚠️ | ✅ |
| NUnit2032 | Consider using Assert.That(expr, Is.Zero) instead of Assert.Zero(expr). | ✅ | ℹ️ | ✅ |
| NUnit2033 | Consider using Assert.That(expr, Is.Not.Zero) instead of Assert.NotZero(expr). | ✅ | ℹ️ | ✅ |
| NUnit2034 | Consider using Assert.That(expr, Is.NaN) instead of Assert.IsNaN(expr). | ✅ | ℹ️ | ✅ |
| NUnit2035 | Consider using Assert.That(collection, Is.Empty) instead of Assert.IsEmpty(collection). | ✅ | ℹ️ | ✅ |
| NUnit2036 | Consider using Assert.That(collection, Is.Not.Empty) instead of Assert.IsNotEmpty(collection). | ✅ | ℹ️ | ✅ |
| NUnit2037 | Consider using Assert.That(collection, Does.Contain(instance)) instead of Assert.Contains(instance, collection). | ✅ | ℹ️ | ✅ |
| NUnit2038 | Consider using Assert.That(actual, Is.InstanceOf(expected)) instead of Assert.IsInstanceOf(expected, actual). | ✅ | ℹ️ | ✅ |
| NUnit2039 | Consider using Assert.That(actual, Is.Not.InstanceOf(expected)) instead of Assert.IsNotInstanceOf(expected, actual). | ✅ | ℹ️ | ✅ |
| NUnit2040 | Non-reference types for SameAs constraint. | ✅ | ❗ | ✅ |
| NUnit2041 | Incompatible types for comparison constraint. | ✅ | ❗ | ❌ |