Fix contains test (#35166)

* Fix contains test

* Force non-nullable to nullable using cast

Author: am11

test/EFCore.Specification.Tests/Query/PrimitiveCollectionsQueryTestBase.cs

@@ -423,14 +423,14 @@ await AssertQuery(
     [MemberData(nameof(IsAsyncData))]
     public virtual async Task Parameter_collection_of_strings_Contains_nullable_string(bool async)
     {
-        var strings = new[] { "10", "999" };
+        string?[] strings = ["10", "999"];
 
         await AssertQuery(
             async,
-            ss => ss.Set<PrimitiveCollectionsEntity>().Where(c => strings.Any(s => s == c.NullableString)));
+            ss => ss.Set<PrimitiveCollectionsEntity>().Where(c => strings.Contains(c.NullableString)));
         await AssertQuery(
             async,
-            ss => ss.Set<PrimitiveCollectionsEntity>().Where(c => !strings.Any(s => s == c.NullableString)));
+            ss => ss.Set<PrimitiveCollectionsEntity>().Where(c => !strings.Contains(c.NullableString)));
     }
 
     [ConditionalTheory]
@@ -574,7 +574,7 @@ public virtual Task Column_collection_of_nullable_ints_Contains_null(bool async)
     public virtual Task Column_collection_of_strings_contains_null(bool async)
         => AssertQuery(
             async,
-            ss => ss.Set<PrimitiveCollectionsEntity>().Where(c => c.Strings.Any(s => s == null)),
+            ss => ss.Set<PrimitiveCollectionsEntity>().Where(c => ((string?[])c.Strings).Contains(null)),
             assertEmpty: true);
 
     [ConditionalTheory]