Added type validation to Assertions.

Disabled type validation on tests with intentionally unresolvable types.
Fixed NPE in KotlinPrinter.
Fixed errors in AnnotationTest.

src/main/java/org/openrewrite/kotlin/internal/KotlinPrinter.java

@@ -1162,7 +1162,7 @@ public J visitVariableDeclarations(J.VariableDeclarations multiVariable, PrintOu
                     p.append("val");
                 }
 
-                if (m.getType() == J.Modifier.Type.LanguageExtension && m.getKeyword().equals("typealias")) {
+                if (m.getType() == J.Modifier.Type.LanguageExtension && m.getKeyword() != null && m.getKeyword().equals("typealias")) {
                     isTypeAlias = true;
                 }
             }

src/main/java/org/openrewrite/kotlin/search/package-info.java

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2023 the original author or authors.
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * https://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+@NonNullApi
+@NonNullFields
+package org.openrewrite.kotlin.search;
+
+import org.openrewrite.internal.lang.NonNullApi;
+import org.openrewrite.internal.lang.NonNullFields;

src/test/java/org/openrewrite/kotlin/KotlinTypeMappingTest.java

@@ -31,6 +31,7 @@
 import org.openrewrite.java.tree.TypeUtils;
 import org.openrewrite.kotlin.tree.K;
 import org.openrewrite.test.RewriteTest;
+import org.openrewrite.test.TypeValidation;
 
 import java.io.ByteArrayInputStream;
 import java.nio.charset.StandardCharsets;
@@ -947,6 +948,7 @@ class A : RemoteStub()
         @Test
         void unknownIdentifier() {
             rewriteRun(
+              spec -> spec.typeValidationOptions(TypeValidation.none()),
               kotlin(
                 //language=none
                 "class A : RemoteStub",

src/test/java/org/openrewrite/kotlin/format/TabsAndIndentsTest.java

@@ -28,6 +28,7 @@
 import org.openrewrite.style.NamedStyles;
 import org.openrewrite.test.RecipeSpec;
 import org.openrewrite.test.RewriteTest;
+import org.openrewrite.test.TypeValidation;
 
 import java.util.function.Consumer;
 import java.util.function.UnaryOperator;
@@ -2223,8 +2224,11 @@ fun test0() {
     @Test
     void trailingLambdaCall() {
         rewriteRun(
+          spec -> spec.typeValidationOptions(TypeValidation.none()),
           kotlin(
             """
+              import kotlin.reflect.full.memberProperties
+              
               inline fun <reified T : Any> T.destruct(): Map<String, Any?> {
                   return T::class.memberProperties.map {
                       it.name to it.get(this)