Change rojo-test to be macro-based

rojo-test/src/build_test.rs

@@ -0,0 +1,53 @@
+use std::{
+    fs,
+    path::Path,
+    process::Command,
+};
+
+use insta::assert_snapshot_matches;
+use tempfile::tempdir;
+
+macro_rules! gen_build_tests {
+    ( $($test_name: ident,)* ) => {
+        $(
+            paste::item! {
+                #[test]
+                fn [<build_ $test_name>]() {
+                    run_build_test(stringify!($test_name));
+                }
+            }
+        )*
+    };
+}
+
+gen_build_tests! {
+    gitkeep,
+    txt_in_folder,
+}
+
+fn run_build_test(test_name: &str) {
+    let manifest_dir = Path::new(env!("CARGO_MANIFEST_DIR"));
+    let build_test_path = manifest_dir.join("build-tests");
+    let working_dir = manifest_dir.parent().unwrap();
+
+    let output_dir = tempdir().expect("couldn't create temporary directory");
+
+    let input_path = build_test_path.join(test_name);
+    let output_path = output_dir.path().join(format!("{}.rbxmx", test_name));
+
+    let status = Command::new("cargo")
+        .args(&[
+            "run", "--quiet", "--",
+            "build", input_path.to_str().unwrap(), "-o", output_path.to_str().unwrap(),
+        ])
+        .current_dir(working_dir)
+        .status()
+        .expect("Couldn't start Rojo");
+
+    assert!(status.success(), "Rojo did not exit successfully");
+
+    let contents = fs::read_to_string(&output_path)
+        .expect("Couldn't read output file");
+
+    assert_snapshot_matches!(test_name, contents);
+}