1 files changed, 23 insertions, 0 deletions

diff --git a/crates/ra_assists/src/doc_tests.rs b/crates/ra_assists/src/doc_tests.rs
new file mode 100644
index 000000000..88e901517
--- /dev/null
+++ b/crates/ra_assists/src/doc_tests.rs
@@ -0,0 +1,23 @@
+//! Each assist definition has a special comment, which specifies docs and
+//! example.
+//!
+//! We collect all the example and write the as tests in this module.
+
+mod generated;
+
+use hir::mock::MockDatabase;
+use ra_db::FileRange;
+use ra_syntax::TextRange;
+use test_utils::{assert_eq_text, extract_offset};
+
+fn check(assist_id: &str, before: &str, after: &str) {
+    let (before_cursor_pos, before) = extract_offset(before);
+    let (db, _source_root, file_id) = MockDatabase::with_single_file(&before);
+    let frange = FileRange { file_id, range: TextRange::offset_len(before_cursor_pos, 0.into()) };
+
+    let (_assist_id, action) =
+        crate::assists(&db, frange).into_iter().find(|(id, _)| id.id.0 == assist_id).unwrap();
+
+    let actual = action.edit.apply(&before);
+    assert_eq_text!(after, &actual);
+}