1 files changed, 137 insertions, 0 deletions

diff --git a/crates/ra_assists/src/tests.rs b/crates/ra_assists/src/tests.rs
new file mode 100644
index 000000000..ca3096a43
--- /dev/null
+++ b/crates/ra_assists/src/tests.rs
@@ -0,0 +1,137 @@
+use std::sync::Arc;
+
+use hir::Semantics;
+use ra_db::{fixture::WithFixture, FileId, FileRange, SourceDatabaseExt};
+use ra_ide_db::{symbol_index::SymbolsDatabase, RootDatabase};
+use ra_syntax::TextRange;
+use test_utils::{
+    add_cursor, assert_eq_text, extract_offset, extract_range, extract_range_or_offset,
+    RangeOrOffset,
+};
+
+use crate::{handlers::Handler, resolved_assists, AssistCtx, AssistFile};
+
+pub(crate) fn with_single_file(text: &str) -> (RootDatabase, FileId) {
+    let (mut db, file_id) = RootDatabase::with_single_file(text);
+    // FIXME: ideally, this should be done by the above `RootDatabase::with_single_file`,
+    // but it looks like this might need specialization? :(
+    db.set_local_roots(Arc::new(vec![db.file_source_root(file_id)]));
+    (db, file_id)
+}
+
+pub(crate) fn check_assist(assist: Handler, ra_fixture_before: &str, ra_fixture_after: &str) {
+    check(assist, ra_fixture_before, ExpectedResult::After(ra_fixture_after));
+}
+
+// FIXME: instead of having a separate function here, maybe use
+// `extract_ranges` and mark the target as `<target> </target>` in the
+// fixuture?
+pub(crate) fn check_assist_target(assist: Handler, ra_fixture: &str, target: &str) {
+    check(assist, ra_fixture, ExpectedResult::Target(target));
+}
+
+pub(crate) fn check_assist_not_applicable(assist: Handler, ra_fixture: &str) {
+    check(assist, ra_fixture, ExpectedResult::NotApplicable);
+}
+
+enum ExpectedResult<'a> {
+    NotApplicable,
+    After(&'a str),
+    Target(&'a str),
+}
+
+fn check(assist: Handler, before: &str, expected: ExpectedResult) {
+    let (text_without_caret, file_with_caret_id, range_or_offset, db) = if before.contains("//-") {
+        let (mut db, position) = RootDatabase::with_position(before);
+        db.set_local_roots(Arc::new(vec![db.file_source_root(position.file_id)]));
+        (
+            db.file_text(position.file_id).as_ref().to_owned(),
+            position.file_id,
+            RangeOrOffset::Offset(position.offset),
+            db,
+        )
+    } else {
+        let (range_or_offset, text_without_caret) = extract_range_or_offset(before);
+        let (db, file_id) = with_single_file(&text_without_caret);
+        (text_without_caret, file_id, range_or_offset, db)
+    };
+
+    let frange = FileRange { file_id: file_with_caret_id, range: range_or_offset.into() };
+
+    let sema = Semantics::new(&db);
+    let assist_ctx = AssistCtx::new(&sema, frange, true);
+
+    match (assist(assist_ctx), expected) {
+        (Some(assist), ExpectedResult::After(after)) => {
+            let action = assist.0[0].action.clone().unwrap();
+
+            let mut actual = if let AssistFile::TargetFile(file_id) = action.file {
+                db.file_text(file_id).as_ref().to_owned()
+            } else {
+                text_without_caret
+            };
+            action.edit.apply(&mut actual);
+
+            match action.cursor_position {
+                None => {
+                    if let RangeOrOffset::Offset(before_cursor_pos) = range_or_offset {
+                        let off = action
+                            .edit
+                            .apply_to_offset(before_cursor_pos)
+                            .expect("cursor position is affected by the edit");
+                        actual = add_cursor(&actual, off)
+                    }
+                }
+                Some(off) => actual = add_cursor(&actual, off),
+            };
+
+            assert_eq_text!(after, &actual);
+        }
+        (Some(assist), ExpectedResult::Target(target)) => {
+            let action = assist.0[0].action.clone().unwrap();
+            let range = action.target.expect("expected target on action");
+            assert_eq_text!(&text_without_caret[range], target);
+        }
+        (Some(_), ExpectedResult::NotApplicable) => panic!("assist should not be applicable!"),
+        (None, ExpectedResult::After(_)) | (None, ExpectedResult::Target(_)) => {
+            panic!("code action is not applicable")
+        }
+        (None, ExpectedResult::NotApplicable) => (),
+    };
+}
+
+#[test]
+fn assist_order_field_struct() {
+    let before = "struct Foo { <|>bar: u32 }";
+    let (before_cursor_pos, before) = extract_offset(before);
+    let (db, file_id) = with_single_file(&before);
+    let frange = FileRange { file_id, range: TextRange::empty(before_cursor_pos) };
+    let assists = resolved_assists(&db, frange);
+    let mut assists = assists.iter();
+
+    assert_eq!(
+        assists.next().expect("expected assist").label.label,
+        "Change visibility to pub(crate)"
+    );
+    assert_eq!(assists.next().expect("expected assist").label.label, "Add `#[derive]`");
+}
+
+#[test]
+fn assist_order_if_expr() {
+    let before = "
+    pub fn test_some_range(a: int) -> bool {
+        if let 2..6 = <|>5<|> {
+            true
+        } else {
+            false
+        }
+    }";
+    let (range, before) = extract_range(before);
+    let (db, file_id) = with_single_file(&before);
+    let frange = FileRange { file_id, range };
+    let assists = resolved_assists(&db, frange);
+    let mut assists = assists.iter();
+
+    assert_eq!(assists.next().expect("expected assist").label.label, "Extract into variable");
+    assert_eq!(assists.next().expect("expected assist").label.label, "Replace with match");
+}