KT-7443 Inspection + intention to replace assert (x != null) with "!!" or elvis

#KT-7443 Fixed

j2k/testData/fileOrElement/assertStatement/assertNotNull.java

@@ -0,0 +1,13 @@
+abstract class C {
+    void foo() {
+        String s1 = f();
+        assert s1 != null;
+
+        String s2 = g();
+        assert s2 != null : "g should not return null";
+        int h = s2.hashCode();
+    }
+
+    abstract void f(): String;
+    abstract void g(): String;
+}

j2k/testData/fileOrElement/assertStatement/assertNotNull.kt

@@ -0,0 +1,11 @@
+internal abstract class C {
+    fun foo() {
+        val s1 = f()!!
+
+        val s2 = g() ?: error("g should not return null")
+        val h = s2.hashCode()
+    }
+
+    internal abstract fun f()
+    internal abstract fun g()
+}

j2k/tests/org/jetbrains/kotlin/j2k/JavaToKotlinConverterForWebDemoTestGenerated.java

@@ -316,6 +316,12 @@ public class JavaToKotlinConverterForWebDemoTestGenerated extends AbstractJavaTo
             KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("j2k/testData/fileOrElement/assertStatement"), Pattern.compile("^(.+)\\.java$"), true);
         }
 
+        @TestMetadata("assertNotNull.java")
+        public void testAssertNotNull() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/assertStatement/assertNotNull.java");
+            doTest(fileName);
+        }
+
         @TestMetadata("onlyCondition.java")
         public void testOnlyCondition() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/assertStatement/onlyCondition.java");

j2k/tests/org/jetbrains/kotlin/j2k/JavaToKotlinConverterSingleFileTestGenerated.java

@@ -316,6 +316,12 @@ public class JavaToKotlinConverterSingleFileTestGenerated extends AbstractJavaTo
             KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("j2k/testData/fileOrElement/assertStatement"), Pattern.compile("^(.+)\\.java$"), true);
         }
 
+        @TestMetadata("assertNotNull.java")
+        public void testAssertNotNull() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/assertStatement/assertNotNull.java");
+            doTest(fileName);
+        }
+
         @TestMetadata("onlyCondition.java")
         public void testOnlyCondition() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/assertStatement/onlyCondition.java");