fixed test source configuration

Author: jhoeller

org.springframework.expression/expression.iml

@@ -5,8 +5,8 @@
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/src/main/resources" isTestSource="false" />
-      <sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="false" />
-      <sourceFolder url="file://$MODULE_DIR$/src/test/resources" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/resources" isTestSource="true" />
     </content>
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="inheritedJdk" />