bugfix: fix issue 290

src/FluentAssertions.Analyzers.Tests/Tips/SanityTests.cs

@@ -448,5 +448,62 @@ public class MyCollectionType { }";
                 })
             );
         }
+
+        [TestMethod]
+        [Implemented(Reason = "https://github.com/fluentassertions/fluentassertions.analyzers/issues/290")]
+        public void ShouldNotReportIssue290()
+        {
+            const string source = @"
+using FluentAssertions;
+using FluentAssertions.Extensions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+public class TestClass
+{
+    public static void Main()
+    {
+        IEnumerable<Item> expectedOrderedNames = new[] { new Item(""Alpha""), new Item(""Bravo""), new Item(""Charlie"") };
+        IEnumerable<Parent> actual = GetSortedItems();
+
+        actual.Select(x => x.Item).Should().Equal(expectedOrderedNames);
+    }
+
+    static IEnumerable<Parent> GetSortedItems()
+    {
+        yield return new Parent(""Bravo"");
+        yield return new Parent(""Charlie"");
+        yield return new Parent(""Alpha"");
+    }
+}
+
+public class Item
+{
+    public string Name { get; set; }
+    public Guid Id { get; set; }
+
+    public Item(string name)
+    {
+        Name = name;
+        Id = Guid.NewGuid();
+    }
+}
+
+public class Parent
+{
+    public Item Item { get; set; }
+
+    public Parent(string name)
+    {
+        Item = new Item(name);
+    }
+}";
+
+            DiagnosticVerifier.VerifyDiagnostic(new DiagnosticVerifierArguments()
+                .WithSources(source)
+                .WithAllAnalyzers()
+                .WithPackageReferences(PackageReference.FluentAssertions_6_12_0)
+            );
+        }
     }
 }

src/FluentAssertions.Analyzers/Tips/DiagnosticMetadata.cs

@@ -47,7 +47,7 @@ private DiagnosticMetadata(string message, string helpLink, [CallerMemberName] s
     public static DiagnosticMetadata CollectionShouldHaveElementAt_SkipFirstShouldBe { get; } = new("Use .Should().HaveElementAt()", GetHelpLink("Collections-26"));
     public static DiagnosticMetadata CollectionShouldBeInAscendingOrder_OrderByShouldEqual { get; } = new("Use .Should().BeInAscendingOrder()", GetHelpLink("Collections-27"));
     public static DiagnosticMetadata CollectionShouldBeInDescendingOrder_OrderByDescendingShouldEqual { get; } = new("Use .Should().BeInDescendingOrder()", GetHelpLink("Collections-28"));
-    public static DiagnosticMetadata CollectionShouldEqualOtherCollectionByComparer_SelectShouldEqualOtherCollectionSelect { get; } = new("Use .Should().BeEquivalentTo()", GetHelpLink("Collections-29"));
+    public static DiagnosticMetadata CollectionShouldEqualOtherCollectionByComparer_SelectShouldEqualOtherCollectionSelect { get; } = new("Use .Should().Equal()", GetHelpLink("Collections-29"));
     public static DiagnosticMetadata CollectionShouldNotIntersectWith_IntersectShouldBeEmpty { get; } = new("Use .Should().NotIntersectWith()", GetHelpLink("Collections-30"));
     public static DiagnosticMetadata CollectionShouldIntersectWith_IntersectShouldNotBeEmpty { get; } = new("Use .Should().IntersectWith()", GetHelpLink("Collections-31"));
     public static DiagnosticMetadata CollectionShouldNotContainNulls_SelectShouldNotContainNulls { get; } = new("Use .Should().NotContainNulls()", GetHelpLink("Collections-32"));

src/FluentAssertions.Analyzers/Tips/FluentAssertionsOperationAnalyzer.cs

@@ -179,7 +179,8 @@ private static void AnalyzeInvocation(OperationAnalysisContext context, FluentAs
                         case nameof(Enumerable.OrderByDescending) when IsEnumerableMethodWithPredicate(invocationBeforeShould, metadata) && invocationBeforeShould.Arguments[0].IsSameArgumentReference(assertion.Arguments[0]):
                             context.ReportDiagnostic(CreateDiagnostic(assertion, DiagnosticMetadata.CollectionShouldBeInDescendingOrder_OrderByDescendingShouldEqual));
                             return;
-                        case nameof(Enumerable.Select) when IsEnumerableMethodWithPredicate(invocationBeforeShould, metadata):
+                        case nameof(Enumerable.Select) when IsEnumerableMethodWithPredicate(invocationBeforeShould, metadata) 
+                            && assertion.Arguments[0].Value is IInvocationOperation { TargetMethod.Name: nameof(Enumerable.Select), Arguments.Length: 2 } expectedInvocation && expectedInvocation.Arguments[1].IsLambda():
                             context.ReportDiagnostic(CreateDiagnostic(assertion, DiagnosticMetadata.CollectionShouldEqualOtherCollectionByComparer_SelectShouldEqualOtherCollectionSelect));
                             return;
                     }