Add end-to-end build tests

rojo-test/src/lib.rs

@@ -0,0 +1,43 @@
+use std::{
+    fs,
+    path::Path,
+    process::Command,
+};
+
+use insta::assert_snapshot_matches;
+use tempfile::tempdir;
+
+static BUILD_TESTS: &[&str] = &[
+    "gitkeep",
+    "txt_in_folder",
+];
+
+#[test]
+fn build_tests() {
+    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");
+
+    for &test_name in BUILD_TESTS {
+        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", "--",
+                "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!(format!("build_{}", test_name), contents);
+    }
+}

rojo-test/src/snapshots/rojo_test__build_gitkeep.snap

@@ -0,0 +1,13 @@
+---
+created: "2019-08-08T00:40:36.892733600Z"
+creator: insta@0.10.0
+source: rojo-test/src/lib.rs
+expression: contents
+---
+<roblox version="4">
+  <Item class="Folder" referent="0">
+    <Properties>
+      <string name="Name">gitkeep</string>
+    </Properties>
+  </Item>
+</roblox>

rojo-test/src/snapshots/rojo_test__build_txt_in_folder.snap

@@ -0,0 +1,19 @@
+---
+created: "2019-08-08T00:40:50.026718300Z"
+creator: insta@0.10.0
+source: rojo-test/src/lib.rs
+expression: contents
+---
+<roblox version="4">
+  <Item class="Folder" referent="0">
+    <Properties>
+      <string name="Name">txt_in_folder</string>
+    </Properties>
+    <Item class="StringValue" referent="1">
+      <Properties>
+        <string name="Name">foo</string>
+        <string name="Value"></string>
+      </Properties>
+    </Item>
+  </Item>
+</roblox>