From a3cf77bd7f0f39de99be80c9e4e35bb4e5641644 Mon Sep 17 00:00:00 2001
From: Jake Goulding <jake.goulding@integer32.com>
Date: Mon, 25 May 2020 13:22:07 -0400
Subject: [PATCH] Add integration test for macro expansion

---
 tests/spec/features/tools_spec.rb | 33 +++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/tests/spec/features/tools_spec.rb b/tests/spec/features/tools_spec.rb
index 983ded16e..d3c82a7f3 100644
--- a/tests/spec/features/tools_spec.rb
+++ b/tests/spec/features/tools_spec.rb
@@ -57,6 +57,39 @@ def code_with_undefined_behavior
     EOF
   end
 
+  scenario "expand macros with the nightly compiler" do
+    editor.set code_that_uses_macros
+    in_tools_menu { click_on("Expand macros") }
+
+    within(".output-stdout") do
+      # First-party
+      expect(page).to have_content('core::fmt::Arguments::new_v1')
+
+      # Third-party procedural macro
+      expect(page).to have_content('block_on(async')
+
+      # User-specified declarative macro
+      expect(page).to have_content('fn created_by_macro() -> i32 { 42 }')
+    end
+  end
+
+  def code_that_uses_macros
+    <<~EOF
+    macro_rules! demo {
+        ($name:ident) => {
+            fn $name() -> i32 { 42 }
+        }
+    }
+
+    demo!(created_by_macro);
+
+    #[tokio::main]
+    async fn example() {
+        println!("a value: {}", created_by_macro());
+    }
+    EOF
+  end
+
   def editor
     Editor.new(page)
   end