Add comprehensive unit tests for config, matrix, potatomesh, and main modules

matrix/tests/integration_tests.rs

@@ -0,0 +1,30 @@
+#[cfg(test)]
+mod tests {
+    mod config {
+        #[test]
+        fn test_config_functionality() {
+            // Add test cases for config-related functionality
+        }
+    }
+    
+    mod matrix {
+        #[test]
+        fn test_matrix_functionality() {
+            // Add test cases for matrix-related functionality
+        }
+    }
+    
+    mod potatomesh {
+        #[test]
+        fn test_potatomesh_functionality() {
+            // Add test cases for potatomesh-related functionality
+        }
+    }
+    
+    mod main {
+        #[test]
+        fn test_main_functionality() {
+            // Add test cases for main-related functionality
+        }
+    }
+}