diff --git a/compiler/testData/readClass/type/ArrayOfCharSequence.kt b/compiler/testData/readClass/type/ArrayOfCharSequence.kt
new file mode 100644
index 00000000000..8ba5d0f0661
--- /dev/null
+++ b/compiler/testData/readClass/type/ArrayOfCharSequence.kt
@@ -0,0 +1,3 @@
+package test
+
+fun nothing(): Array<java.lang.CharSequence> = throw Exception()
diff --git a/compiler/testData/writeSignature/Int.kt b/compiler/testData/writeSignature/Int.kt
new file mode 100644
index 00000000000..7b92774953a
--- /dev/null
+++ b/compiler/testData/writeSignature/Int.kt
@@ -0,0 +1,6 @@
+fun key(): Int = throw Exception()
+
+// method: namespace::key
+// jvm signature:     ()I
+// generic signature: null
+// kotlin signature:  ()I // TODO: make null
diff --git a/compiler/testData/writeSignature/IntQ.kt b/compiler/testData/writeSignature/IntQ.kt
new file mode 100644
index 00000000000..9f1c64ad65d
--- /dev/null
+++ b/compiler/testData/writeSignature/IntQ.kt
@@ -0,0 +1,6 @@
+fun sometimes(): Int? = null
+
+// method: namespace::sometimes
+// jvm signature:     ()Ljava/lang/Integer;
+// generic signature: null
+// kotlin signature:  ()?Ljava/lang/Integer; // TODO: need to skip kotlin signature