Added test with class signature unchanged.

jps-plugin/test/org/jetbrains/jet/jps/build/IncrementalJpsTestGenerated.java

@@ -41,6 +41,11 @@ public class IncrementalJpsTestGenerated extends AbstractIncrementalJpsTest {
         doTest("jps-plugin/testData/incremental/classSignatureChanged/");
     }
     
+    @TestMetadata("classSignatureUnchanged")
+    public void testClassSignatureUnchanged() throws Exception {
+        doTest("jps-plugin/testData/incremental/classSignatureUnchanged/");
+    }
+    
     @TestMetadata("constantUnchanged")
     public void testConstantUnchanged() throws Exception {
         doTest("jps-plugin/testData/incremental/constantUnchanged/");

jps-plugin/testData/incremental/classSignatureUnchanged/build.log

@@ -0,0 +1,6 @@
+Cleaning output files:
+out/production/module/test/Klass.class
+End of files
+Compiling files:
+src/class.kt
+End of files

jps-plugin/testData/incremental/classSignatureUnchanged/class.kt

@@ -0,0 +1,7 @@
+package test
+
+class Klass {
+    fun foo() = ":)"
+
+    fun bar() = ":("
+}

jps-plugin/testData/incremental/classSignatureUnchanged/class.kt.new

@@ -0,0 +1,8 @@
+package test
+
+// swapped functions
+class Klass {
+    fun bar() = ":("
+
+    fun foo() = ":)"
+}

jps-plugin/testData/incremental/classSignatureUnchanged/usage.kt

@@ -0,0 +1,6 @@
+package test
+
+fun usage(a: Klass) {
+    a.foo()
+    a.bar()
+}