add unit test files for C#

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/CSharpClientCodegen.java

@@ -41,6 +41,7 @@ public class CSharpClientCodegen extends DefaultCodegen implements CodegenConfig
     protected String packageVersion = "1.0.0";
     protected String clientPackage = "IO.Swagger.Client";
     protected String sourceFolder = "src" + File.separator + "main" + File.separator + "csharp";
+    protected String testFolder = "Test";
 
     public CSharpClientCodegen() {
         super();
@@ -51,6 +52,9 @@ public class CSharpClientCodegen extends DefaultCodegen implements CodegenConfig
         apiPackage = "IO.Swagger.Api";
         modelPackage = "IO.Swagger.Model";
 
+        modelTestTemplateFiles.put("model_test.mustache", ".cs");
+        apiTestTemplateFiles.put("api_test.mustache", ".cs");
+
         reservedWords = new HashSet<String>(
                 Arrays.asList(
                     // local variable names in API methods (endpoints)
@@ -270,6 +274,16 @@ public class CSharpClientCodegen extends DefaultCodegen implements CodegenConfig
         return "_" + name;
     }
 
+     @Override
+     public String apiTestFileFolder() {
+         return outputFolder + ".Test";
+     }
+ 
+     @Override
+     public String modelTestFileFolder() {
+         return outputFolder + ".Test";
+     }
+
     @Override
     public String apiFileFolder() {
         return outputFolder + File.separator + sourceFolder + File.separator + apiPackage().replace('.', File.separatorChar);
@@ -342,6 +356,16 @@ public class CSharpClientCodegen extends DefaultCodegen implements CodegenConfig
         return toModelName(name);
     }
 
+    @Override
+    public String toApiTestFilename(String name) {
+        return toApiName(name) + "Tests";
+    }
+ 
+    @Override
+    public String toModelTestFilename(String name) {
+        return toModelName(name) + "Tests";
+    }
+
     @Override
     public Map<String, Object> postProcessOperations(Map<String, Object> objs) {
         super.postProcessOperations(objs);