[spv-out] Add initial Rosetta test (#181)

* [spv-out] Add initial Rosetta test

For now just check that spv-out succeeds

* [spv-out] Check spv output has len > 0

src/back/spv/mod.rs

@@ -9,6 +9,9 @@ mod test_framework;
 #[cfg(test)]
 mod layout_tests;
 
+#[cfg(all(test, feature = "deserialize"))]
+mod rosetta_tests;
+
 pub use writer::Writer;
 
 use spirv::*;

src/back/spv/rosetta_tests.rs

@@ -0,0 +1,17 @@
+use std::{fs, path::Path};
+
+const TEST_PATH: &str = "test-data";
+
+fn rosetta_test(file_name: &str) {
+    let test_dir = Path::new(TEST_PATH);
+    let input = fs::read_to_string(test_dir.join(file_name)).unwrap();
+    let module: crate::Module = ron::de::from_str(&input).unwrap();
+
+    let spv = super::Writer::new(&module.header, super::WriterFlags::NONE).write(&module);
+    assert!(spv.len() > 0, "spv.len() > 0");
+}
+
+#[test]
+fn simple() {
+    rosetta_test("simple/simple.expected.ron")
+}