test(pg-from): generate sql matches to expected sql

package/postgres/pg-from/test/generate_sql.rs

@@ -0,0 +1,62 @@
+use std::process::Command;
+use std::fs;
+use std::path::Path;
+
+#[test]
+fn generated_sql_matches_expected() {
+    // Adjust this path if your fixture folder is located somewhere else.
+    let fixture_dir = "test/fixture";
+    let input_db = format!("{}/test.db", fixture_dir);
+    let expected_sql_path = format!("{}/expected.sql", fixture_dir);
+    let output_sql_path = format!("{}/generated.sql", fixture_dir);
+
+    // Remove any previously generated file.
+    let _ = fs::remove_file(&output_sql_path);
+
+    // Check that fixture files exist.
+    assert!(
+        Path::new(&input_db).exists(),
+        "Input DB does not exist: {}",
+        input_db
+    );
+    assert!(
+        Path::new(&expected_sql_path).exists(),
+        "Expected SQL does not exist: {}",
+        expected_sql_path
+    );
+
+    // The following env var is set automatically by Cargo when building binaries.
+    // It points to the location of the built binary (assuming your binary is named "pg-from").
+    let exe = env!("CARGO_BIN_EXE_pg-from");
+
+    // Run your binary with the required arguments.
+    let status = Command::new(exe)
+        .args(&[
+            &input_db,
+            &output_sql_path,
+            "legacy",
+            "--inherit=created_at",
+            "--inherit=updated_at",
+        ])
+        .status()
+        .expect("Failed to execute pg-from binary");
+
+    assert!(
+        status.success(),
+        "pg-from did not run successfully (exit status: {:?})",
+        status.code()
+    );
+
+    // Read the generated output and the expected output.
+    let generated = fs::read_to_string(&output_sql_path)
+        .expect("Failed to read generated SQL file");
+    let expected = fs::read_to_string(&expected_sql_path)
+        .expect("Failed to read expected SQL file");
+
+    // Compare the two strings.
+    assert_eq!(
+        generated, expected,
+        "Generated SQL does not match expected SQL"
+    );
+}
+