1 files changed, 52 insertions, 0 deletions
diff --git a/toolkit/components/glean/tests/gtest/test.rs b/toolkit/components/glean/tests/gtest/test.rs
new file mode 100644
index 0000000000..f84454b266
--- /dev/null
+++ b/toolkit/components/glean/tests/gtest/test.rs
@@ -0,0 +1,52 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+extern crate nsstring;
+use nsstring::nsString;
+
+fn nonfatal_fail(msg: String) {
+    extern "C" {
+        fn GTest_FOG_ExpectFailure(message: *const ::std::os::raw::c_char);
+    }
+    unsafe {
+        let msg = ::std::ffi::CString::new(msg).unwrap();
+        GTest_FOG_ExpectFailure(msg.as_ptr());
+    }
+}
+
+/// This macro checks if the expression evaluates to true,
+/// and causes a non-fatal GTest test failure if it doesn't.
+macro_rules! expect {
+    ($x:expr) => {
+        match (&$x) {
+            true => {}
+            false => nonfatal_fail(format!(
+                "check failed: (`{}`) at {}:{}",
+                stringify!($x),
+                file!(),
+                line!()
+            )),
+        }
+    };
+}
+
+#[no_mangle]
+pub extern "C" fn Rust_TestRustInGTest() {
+    // Just a smoke test, we show here how tests might work that both
+    // a) Are in Rust, and
+    // b) Require Gecko
+    // This demonstration doesn't actually require Gecko. But we pretend it
+    // does so we remember how to do this rust-in-gtest pattern.
+    fog::metrics::test_only::bad_code.add(12);
+    expect!(fog::metrics::test_only::bad_code.test_get_value(None) == Some(12));
+}
+
+#[no_mangle]
+pub extern "C" fn Rust_TestJogfile() {
+    // Ensure that the generated jogfile in t/c/g/tests/pytest
+    // (which is installed nearby using TEST_HARNESS_FILES)
+    // can be consumed by JOG's inner workings
+    //
+    // If it can't, that's perhaps a sign that the inner workings need to be updated.
+    expect!(jog::jog_load_jogfile(&nsString::from("jogfile_output")));
+}