Extract Function: Add test for ===

#KT-7663 Fixed

idea/testData/refactoring/extractFunction/basic/identityEquals.kt

@@ -0,0 +1,9 @@
+// SUGGESTED_NAMES: b, getT
+// PARAM_DESCRIPTOR: value-parameter val a: kotlin.Int defined in test
+// PARAM_DESCRIPTOR: value-parameter val b: kotlin.Int defined in test
+// PARAM_TYPES: kotlin.Int, Number, Comparable<Int>, Any
+// PARAM_TYPES: kotlin.Int, Number, Comparable<Int>, Any
+
+fun test(a: Int, b: Int): Boolean {
+    val t = <selection>a === b</selection>
+}

idea/testData/refactoring/extractFunction/basic/identityEquals.kt.after

@@ -0,0 +1,11 @@
+// SUGGESTED_NAMES: b, getT
+// PARAM_DESCRIPTOR: value-parameter val a: kotlin.Int defined in test
+// PARAM_DESCRIPTOR: value-parameter val b: kotlin.Int defined in test
+// PARAM_TYPES: kotlin.Int, Number, Comparable<Int>, Any
+// PARAM_TYPES: kotlin.Int, Number, Comparable<Int>, Any
+
+fun test(a: Int, b: Int): Boolean {
+    val t = b(a, b)
+}
+
+private fun b(a: Int, b: Int) = a === b

idea/tests/org/jetbrains/kotlin/idea/refactoring/introduce/JetExtractionTestGenerated.java

@@ -366,6 +366,12 @@ public class JetExtractionTestGenerated extends AbstractJetExtractionTest {
                 doExtractFunctionTest(fileName);
             }
 
+            @TestMetadata("identityEquals.kt")
+            public void testIdentityEquals() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("idea/testData/refactoring/extractFunction/basic/identityEquals.kt");
+                doExtractFunctionTest(fileName);
+            }
+
             @TestMetadata("invisibleType.kt")
             public void testInvisibleType() throws Exception {
                 String fileName = JetTestUtils.navigationMetadata("idea/testData/refactoring/extractFunction/basic/invisibleType.kt");