Allow return of wrapped functions value.

This allows the macro to return the value of the function being
annotated. For most testing, this probably shouldn't matter, but
considering it's simple enough to do I decided to add it in in case any
other test wrappers require it.

macros/src/lib.rs

@@ -48,8 +48,11 @@ pub fn test_context(attr: TokenStream, item: TokenStream) -> TokenStream {
                     ).catch_unwind().await
                 }.await;
                 <#context_type as test_context::AsyncTestContext>::teardown(ctx).await;
-                if let Err(err) = result {
-                    std::panic::resume_unwind(err);
+                match result {
+                    Ok(returned_value) => returned_value,
+                    Err(err) => {
+                        std::panic::resume_unwind(err);
+                    }
                 }
             }
         }
@@ -59,11 +62,14 @@ pub fn test_context(attr: TokenStream, item: TokenStream) -> TokenStream {
                 let mut ctx = <#context_type as test_context::TestContext>::setup();
                 let mut wrapper = std::panic::AssertUnwindSafe(&mut ctx);
                 let result = std::panic::catch_unwind(move || {
-                    #wrapped_name(*wrapper);
+                    #wrapped_name(*wrapper)
                 });
                 <#context_type as test_context::TestContext>::teardown(ctx);
-                if let Err(err) = result {
-                    std::panic::resume_unwind(err);
+                match result {
+                    Ok(returned_value) => returned_value,
+                    Err(err) => {
+                        std::panic::resume_unwind(err);
+                    }
                 }
             }
         }

tests/test.rs

@@ -37,6 +37,16 @@ fn test_panicking_teardown(ctx: &mut Context) {
     panic!("First panic");
 }
 
+#[test_context(Context)]
+fn return_value_func(ctx: &mut Context) -> u32 {
+    ctx.n
+}
+
+#[test]
+fn includes_return_value() {
+    assert_eq!(return_value_func(), 1);
+}
+
 struct AsyncContext {
     n: u32,
 }
@@ -74,3 +84,13 @@ async fn test_async_panicking_teardown(ctx: &mut AsyncContext) {
     ctx.n = 2;
     panic!("First panic");
 }
+
+#[test_context(AsyncContext)]
+async fn async_return_value_func(ctx: &mut AsyncContext) -> u32 {
+    ctx.n
+}
+
+#[tokio::test]
+async fn async_includes_return_value() {
+    assert_eq!(async_return_value_func().await, 1);
+}