Extract junit testcase, delete unneeded code

compiler/testData/codegen/junit/kt1592.kt

@@ -0,0 +1,3 @@
+import org.junit.Test
+
+Test fun foo(m : java.lang.reflect.Method) = "OK"

compiler/testData/codegen/junit/kt2344.kt

@@ -0,0 +1,12 @@
+import kotlin.test.*
+import org.junit.Test as test
+
+public class Test {
+    test fun f(): Unit {
+        assertEquals(true, !false)
+    }
+}
+
+fun foo() {
+    Test().f()
+}