Sets testFolder when setting sourceFolder

Author: ruimaciel

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

@@ -210,6 +210,9 @@ public void processOpts() {
         // {{sourceFolder}}
         if (additionalProperties.containsKey(CodegenConstants.SOURCE_FOLDER)) {
             setSourceFolder((String) additionalProperties.get(CodegenConstants.SOURCE_FOLDER));
+            // By default, the test folder shares the same path as the source folder.
+            // Therefore, both are updated when setting the source folder.
+            setTestFolder((String) additionalProperties.get(CodegenConstants.SOURCE_FOLDER));
         } else {
             additionalProperties.put(CodegenConstants.SOURCE_FOLDER, this.sourceFolder);
         }
@@ -925,6 +928,10 @@ public void setSourceFolder(String sourceFolder) {
         this.sourceFolder = sourceFolder;
     }
 
+    public void setTestFolder(String testFolder) {
+        this.testFolder = testFolder;
+    }
+
     public String getInterfacePrefix() {
         return interfacePrefix;
     }