Replace null checks with is null / is not null (#650)

+semver:patch

Author: hazzik

src/FluentNHibernate.Specs/Automapping/Fixtures/AutomappingSpecExtensions.cs

@@ -51,15 +51,15 @@ public XmlElementTester(XmlDocument doc, string path)
 
         public XmlElementTester ShouldExist()
         {
-            if (currentElement == null)
+            if (currentElement is null)
                 throw new SpecificationException(string.Format("Should exist at {0} but does not.", currentPath));
 
             return this;
         }
 
         public XmlElementTester ShouldNotExist()
         {
-            if (currentElement != null)
+            if (currentElement is not null)
                 throw new SpecificationException(string.Format("Should not exist at {0} but does.", currentPath));
 
             return this;

src/FluentNHibernate.Testing/AutoMapping/TestFixtures.cs

@@ -330,7 +330,7 @@ public System.Type ReturnedClass
         public new bool Equals(object x, object y)
         {
             if (x == y) return true;
-            if (x == null || y == null) return false;
+            if (x is null || y is null) return false;
 
             DoubleString lhs = (DoubleString)x;
             DoubleString rhs = (DoubleString)y;
@@ -349,7 +349,7 @@ public int GetHashCode(object x)
 
         public Object DeepCopy(Object x)
         {
-            if (x == null) return null;
+            if (x is null) return null;
             DoubleString result = new DoubleString();
             DoubleString input = (DoubleString)x;
             result.s1 = input.s1;
@@ -367,7 +367,7 @@ public object NullSafeGet(DbDataReader dr, string[] names, ISessionImplementor s
             string first = (string)NHibernateUtil.String.NullSafeGet(dr, names[0], session, owner);
             string second = (string)NHibernateUtil.String.NullSafeGet(dr, names[1], session, owner);
 
-            return (first == null && second == null) ? null : new string[] { first, second };
+            return (first is null && second is null) ? null : new string[] { first, second };
         }
 
         public void NullSafeSet(DbCommand cmd, object value, int index, bool[] settable, ISessionImplementor session)

src/FluentNHibernate.Testing/Cfg/Db/PersistenceConfigurationTester.cs

@@ -20,7 +20,7 @@ public void SetUp()
 
     public string ValueOf(string key)
     {
-        if( _nhibConfig == null )
+        if( _nhibConfig is null )
         {
             _nhibConfig = new Configuration();
             _config.ConfigureProperties(_nhibConfig);

src/FluentNHibernate.Testing/ConventionsTests/ApplyingToModel/ArrayConventionTests.cs

@@ -185,7 +185,7 @@ private void VerifyModel(Action<CollectionMapping> modelVerification)
 
         var generatedModels = model.BuildMappings();
         var modelInstance = generatedModels
-            .First(x => x.Classes.FirstOrDefault(c => c.Type == typeof(ExampleParentClass)) != null)
+            .First(x => x.Classes.FirstOrDefault(c => c.Type == typeof(ExampleParentClass)) is not null)
             .Classes.First()
             .Collections.First();
 

src/FluentNHibernate.Testing/ConventionsTests/ApplyingToModel/ClassConventionTests.cs

@@ -148,7 +148,7 @@ private void VerifyModel(Action<ClassMapping> modelVerification)
 
         var generatedModels = model.BuildMappings();
         var modelInstance = generatedModels
-            .First(x => x.Classes.FirstOrDefault(c => c.Type == typeof(ExampleClass)) != null)
+            .First(x => x.Classes.FirstOrDefault(c => c.Type == typeof(ExampleClass)) is not null)
             .Classes.First();
 
         modelVerification(modelInstance);

src/FluentNHibernate.Testing/ConventionsTests/ApplyingToModel/ComponentConventionTests.cs

@@ -77,7 +77,7 @@ private void VerifyModel(Action<ComponentMapping> modelVerification)
 
         var generatedModels = model.BuildMappings();
         var modelInstance = (ComponentMapping)generatedModels
-            .First(x => x.Classes.FirstOrDefault(c => c.Type == typeof(PropertyTarget)) != null)
+            .First(x => x.Classes.FirstOrDefault(c => c.Type == typeof(PropertyTarget)) is not null)
             .Classes.First()
             .Components.First(x => x is ComponentMapping);
 

src/FluentNHibernate.Testing/ConventionsTests/ApplyingToModel/CompositeIdConventionTests.cs

@@ -60,7 +60,7 @@ private void VerifyModel(Action<CompositeIdMapping> modelVerification)
 
         var generatedModels = model.BuildMappings();
         var modelInstance = generatedModels
-            .First(x => x.Classes.FirstOrDefault(c => c.Type == typeof(ExampleClass)) != null)
+            .First(x => x.Classes.FirstOrDefault(c => c.Type == typeof(ExampleClass)) is not null)
             .Classes.First()
             .Id;
 

src/FluentNHibernate.Testing/ConventionsTests/ApplyingToModel/DynamicComponentConventionTests.cs

@@ -82,7 +82,7 @@ private void VerifyModel(Action<ComponentMapping> modelVerification)
 
         var generatedModels = model.BuildMappings();
         var modelInstance = (ComponentMapping)generatedModels
-            .First(x => x.Classes.FirstOrDefault(c => c.Type == typeof(PropertyTarget)) != null)
+            .First(x => x.Classes.FirstOrDefault(c => c.Type == typeof(PropertyTarget)) is not null)
             .Classes.First()
             .Components.First(x => x is ComponentMapping);
 

src/FluentNHibernate.Testing/ConventionsTests/ApplyingToModel/HasManyCollectionConventionTests.cs

@@ -257,7 +257,7 @@ private void VerifyModel(Action<CollectionMapping> modelVerification)
 
         var generatedModels = model.BuildMappings();
         var modelInstance = generatedModels
-            .First(x => x.Classes.FirstOrDefault(c => c.Type == typeof(ExampleInheritedClass)) != null)
+            .First(x => x.Classes.FirstOrDefault(c => c.Type == typeof(ExampleInheritedClass)) is not null)
             .Classes.First()
             .Collections.First();
 

src/FluentNHibernate.Testing/ConventionsTests/ApplyingToModel/HasManyConventionTests.cs

@@ -239,7 +239,7 @@ private void VerifyModel(Action<CollectionMapping> modelVerification)
 
         var generatedModels = model.BuildMappings();
         var modelInstance = generatedModels
-            .First(x => x.Classes.FirstOrDefault(c => c.Type == typeof(ExampleInheritedClass)) != null)
+            .First(x => x.Classes.FirstOrDefault(c => c.Type == typeof(ExampleInheritedClass)) is not null)
             .Classes.First()
             .Collections.First();