1 files changed, 19 insertions, 0 deletions

diff --git a/crates/ra_ide_api/src/test_utils.rs b/crates/ra_ide_api/src/test_utils.rs
new file mode 100644
index 000000000..d0bd3a1e4
--- /dev/null
+++ b/crates/ra_ide_api/src/test_utils.rs
@@ -0,0 +1,19 @@
+use ra_syntax::{SourceFile, TextUnit};
+use ra_text_edit::TextEdit;
+
+pub use test_utils::*;
+
+pub fn check_action<F: Fn(&SourceFile, TextUnit) -> Option<TextEdit>>(
+    before: &str,
+    after: &str,
+    f: F,
+) {
+    let (before_cursor_pos, before) = extract_offset(before);
+    let file = SourceFile::parse(&before);
+    let result = f(&file, before_cursor_pos).expect("code action is not applicable");
+    let actual = result.apply(&before);
+    let actual_cursor_pos =
+        result.apply_to_offset(before_cursor_pos).expect("cursor position is affected by the edit");
+    let actual = add_cursor(&actual, actual_cursor_pos);
+    assert_eq_text!(after, &actual);
+}