diff --git a/compiler/testData/codegen/box/strings/interpolation.kt b/compiler/testData/codegen/box/strings/interpolation.kt
new file mode 100644
index 00000000000..772cb33771a
--- /dev/null
+++ b/compiler/testData/codegen/box/strings/interpolation.kt
@@ -0,0 +1,9 @@
+fun test(p: String?): String {
+    return "${p ?: "Default"} test"
+}
+fun box(): String {
+    if (test(null) != "Default test") return "fail 1: ${test(null)}"
+    if (test("Good") != "Good test") return "fail 1: ${test("OK")}"
+
+    return "OK"
+}
\ No newline at end of file
diff --git a/compiler/testData/codegen/bytecodeText/stringBuilderAppend.kt b/compiler/testData/codegen/bytecodeText/stringOperations/concat.kt
similarity index 100%
rename from compiler/testData/codegen/bytecodeText/stringBuilderAppend.kt
rename to compiler/testData/codegen/bytecodeText/stringOperations/concat.kt
diff --git a/compiler/testData/codegen/bytecodeText/stringOperations/infixPlus.kt b/compiler/testData/codegen/bytecodeText/stringOperations/infixPlus.kt
new file mode 100644
index 00000000000..03057e0a39a
--- /dev/null
+++ b/compiler/testData/codegen/bytecodeText/stringOperations/infixPlus.kt
@@ -0,0 +1,17 @@
+class A() {
+
+    override fun toString(): String {
+        return "A"
+    }
+}
+
+
+fun box() : String {
+
+    val s = "1" plus "2" plus 3 plus 4L plus 5.0 plus 6F plus '7' plus A()
+
+    return "OK"
+}
+
+/*TODO:
+1 NEW java/lang/StringBuilder*/
diff --git a/compiler/testData/codegen/bytecodeText/stringOperations/interpolation.kt b/compiler/testData/codegen/bytecodeText/stringOperations/interpolation.kt
new file mode 100644
index 00000000000..de15a668890
--- /dev/null
+++ b/compiler/testData/codegen/bytecodeText/stringOperations/interpolation.kt
@@ -0,0 +1,16 @@
+class A() {
+
+    override fun toString(): String {
+        return "A"
+    }
+}
+
+
+fun box() : String {
+    val p = 1
+    val s = "${p}${2}${3}${4L}${5.0}${6F}${7}${A()}"
+
+    return "OK"
+}
+
+// 1 NEW java/lang/StringBuilder
\ No newline at end of file
diff --git a/compiler/testData/codegen/bytecodeText/stringOperations/plusAssign.kt b/compiler/testData/codegen/bytecodeText/stringOperations/plusAssign.kt
new file mode 100644
index 00000000000..9e71eeb9824
--- /dev/null
+++ b/compiler/testData/codegen/bytecodeText/stringOperations/plusAssign.kt
@@ -0,0 +1,16 @@
+class A() {
+
+    override fun toString(): String {
+        return "A"
+    }
+}
+
+
+fun box() : String {
+    var s = "1"
+    s += "2" + 3 + 4L + 5.0 + 6F + '7' + A()
+
+    return "OK"
+}
+
+// 1 NEW java/lang/StringBuilder
\ No newline at end of file
diff --git a/compiler/tests/org/jetbrains/kotlin/codegen/BytecodeTextTestGenerated.java b/compiler/tests/org/jetbrains/kotlin/codegen/BytecodeTextTestGenerated.java
index f02f6b146cd..72a4fda9089 100644
--- a/compiler/tests/org/jetbrains/kotlin/codegen/BytecodeTextTestGenerated.java
+++ b/compiler/tests/org/jetbrains/kotlin/codegen/BytecodeTextTestGenerated.java
@@ -42,6 +42,7 @@ import java.util.regex.Pattern;
         BytecodeTextTestGenerated.Statements.class,
         BytecodeTextTestGenerated.StaticFields.class,
         BytecodeTextTestGenerated.StoreStackBeforeInline.class,
+        BytecodeTextTestGenerated.StringOperations.class,
         BytecodeTextTestGenerated.When.class,
         BytecodeTextTestGenerated.WhenEnumOptimization.class,
         BytecodeTextTestGenerated.WhenStringOptimization.class,
@@ -208,12 +209,6 @@ public class BytecodeTextTestGenerated extends AbstractBytecodeTextTest {
         doTest(fileName);
     }
 
-    @TestMetadata("stringBuilderAppend.kt")
-    public void testStringBuilderAppend() throws Exception {
-        String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/bytecodeText/stringBuilderAppend.kt");
-        doTest(fileName);
-    }
-
     @TestMetadata("topLevelFunWithDefaultArgs.kt")
     public void testTopLevelFunWithDefaultArgs() throws Exception {
         String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/bytecodeText/topLevelFunWithDefaultArgs.kt");
@@ -661,6 +656,39 @@ public class BytecodeTextTestGenerated extends AbstractBytecodeTextTest {
         }
     }
 
+    @TestMetadata("compiler/testData/codegen/bytecodeText/stringOperations")
+    @TestDataPath("$PROJECT_ROOT")
+    @RunWith(JUnit3RunnerWithInners.class)
+    public static class StringOperations extends AbstractBytecodeTextTest {
+        public void testAllFilesPresentInStringOperations() throws Exception {
+            JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/bytecodeText/stringOperations"), Pattern.compile("^(.+)\\.kt$"), true);
+        }
+
+        @TestMetadata("concat.kt")
+        public void testConcat() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/bytecodeText/stringOperations/concat.kt");
+            doTest(fileName);
+        }
+
+        @TestMetadata("infixPlus.kt")
+        public void testInfixPlus() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/bytecodeText/stringOperations/infixPlus.kt");
+            doTest(fileName);
+        }
+
+        @TestMetadata("interpolation.kt")
+        public void testInterpolation() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/bytecodeText/stringOperations/interpolation.kt");
+            doTest(fileName);
+        }
+
+        @TestMetadata("plusAssign.kt")
+        public void testPlusAssign() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/bytecodeText/stringOperations/plusAssign.kt");
+            doTest(fileName);
+        }
+    }
+
     @TestMetadata("compiler/testData/codegen/bytecodeText/when")
     @TestDataPath("$PROJECT_ROOT")
     @RunWith(JUnit3RunnerWithInners.class)
diff --git a/compiler/tests/org/jetbrains/kotlin/codegen/generated/BlackBoxCodegenTestGenerated.java b/compiler/tests/org/jetbrains/kotlin/codegen/generated/BlackBoxCodegenTestGenerated.java
index 9ac83449a76..9a0f13ef367 100644
--- a/compiler/tests/org/jetbrains/kotlin/codegen/generated/BlackBoxCodegenTestGenerated.java
+++ b/compiler/tests/org/jetbrains/kotlin/codegen/generated/BlackBoxCodegenTestGenerated.java
@@ -6525,6 +6525,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             doTest(fileName);
         }
 
+        @TestMetadata("interpolation.kt")
+        public void testInterpolation() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/box/strings/interpolation.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("kt2592.kt")
         public void testKt2592() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/box/strings/kt2592.kt");