Fix incorrect file name regex logic

directjngine/src/main/java/com/softwarementors/extjs/djn/jscodegen/CodeFileGenerator.java

@@ -166,9 +166,8 @@ private static boolean fileContentEquals(File file, String code) throws IOExcept
     }
     return false;
   }
-
-  private static String getDebugFileName( String file ) {
-    String result = file.replace( ".js", "-debug.js");
-    return result;
+
+  protected static String getDebugFileName( String file ) {
+    return file.replaceFirst( ".js$" , "-debug.js" );
   }
 }

directjngine/src/test/java/com/softwarementors/extjs/djn/jscodegen/CodeFileGeneratorTest.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2018-present Sonatype, Inc.
+ *
+ * This file is part of DirectJNgine.
+ *
+ * DirectJNgine is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License.
+ *
+ * Commercial use is permitted to the extent that the code/component(s)
+ * do NOT become part of another Open Source or Commercially developed
+ * licensed development library or toolkit without explicit permission.
+ *
+ * DirectJNgine is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with DirectJNgine.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * This software uses the ExtJs library (http://extjs.com), which is
+ * distributed under the GPL v3 license (see http://extjs.com/license).
+ */
+package com.softwarementors.extjs.djn.jscodegen;
+
+import org.testng.annotations.Test;
+
+import static org.testng.Assert.assertEquals;
+
+public class CodeFileGeneratorTest {
+
+    @Test
+    public void getDebugFileNameTest() {
+        assertEquals( "john.jspiner" , CodeFileGenerator.getDebugFileName( "john.jspiner" ) );
+        assertEquals( "app-debug.js" , CodeFileGenerator.getDebugFileName( "app.js" ) );
+    }
+}