add comments

modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultCodegen.java

@@ -284,7 +284,7 @@ public class DefaultCodegen {
     }
 
     /**
-     * Return the file name of the Api
+     * Return the file name of the Api Test
      * 
      * @param name the file name of the Api
      * @return the file name of the Api
@@ -314,7 +314,7 @@ public class DefaultCodegen {
     }
 
     /**
-     * Return the capitalized file name of the model
+     * Return the capitalized file name of the model test
      * 
      * @param name the model name
      * @return the file name of the model
@@ -2071,6 +2071,14 @@ public class DefaultCodegen {
         return apiFileFolder() + '/' + toApiFilename(tag) + suffix;
     }
 
+    /**
+     * Return the full path and API test file
+     *
+     * @param templateName template name
+     * @param tag tag
+     *
+     * @return the API test file name with full path
+     */
     public String apiTestFilename(String templateName, String tag) {
         String suffix = apiTestTemplateFiles().get(templateName);
         return apiTestFileFolder() + '/' + toApiTestFilename(tag) + suffix;

modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultGenerator.java

@@ -311,6 +311,7 @@ public class DefaultGenerator extends AbstractGenerator implements Generator {
                         files.add(new File(filename));
                     }
 
+                    // to generate api test files
                     for (String templateName : config.apiTestTemplateFiles().keySet()) {
                         String filename = config.apiTestFilename(templateName, tag);
                         if (!config.shouldOverwrite(filename) && new File(filename).exists()) {