add basic impl TestContext for AsyncTestContext

src/lib.rs

@@ -84,3 +84,18 @@ where
     /// normal "drop" semantics.
     async fn teardown(self) {}
 }
+
+// Automatically impl TestContext for anything Send that impls AsyncTestContext.
+//
+// A future improvement may be to use feature flags to enable using a specific runtime
+// to run the future synchronously. This is the easiest way to implement it, though, and
+// introduces no new dependencies.
+impl<T> TestContext for T where T: AsyncTestContext + Send {
+    fn setup() -> Self {
+        futures::executor::block_on(<T as AsyncTestContext>::setup())
+    }
+
+    fn teardown(self) {
+        futures::executor::block_on(<T as AsyncTestContext>::teardown(self))
+    }
+}

tests/test.rs

@@ -94,3 +94,9 @@ async fn async_return_value_func(ctx: &mut AsyncContext) -> u32 {
 async fn async_includes_return_value() {
     assert_eq!(async_return_value_func().await, 1);
 }
+
+#[test_context(AsyncContext)]
+#[test]
+fn async_auto_impls_sync(ctx: &mut AsyncContext) {
+    assert_eq!(ctx.n, 1);
+}