fix tests

crates/ra_ide_api/src/parent_module.rs

@@ -0,0 +1,52 @@
+use ra_db::{Cancelable, FilePosition};
+
+use crate::{NavigationTarget, db::RootDatabase};
+
+/// This returns `Vec` because a module may be included from several places. We
+/// don't handle this case yet though, so the Vec has length at most one.
+pub(crate) fn parent_module(
+    db: &RootDatabase,
+    position: FilePosition,
+) -> Cancelable<Vec<NavigationTarget>> {
+    let module = match hir::source_binder::module_from_position(db, position)? {
+        None => return Ok(Vec::new()),
+        Some(it) => it,
+    };
+    let nav = NavigationTarget::from_module(db, module)?;
+    Ok(vec![nav])
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::mock_analysis::analysis_and_position;
+
+    #[test]
+    fn test_resolve_parent_module() {
+        let (analysis, pos) = analysis_and_position(
+            "
+            //- /lib.rs
+            mod foo;
+            //- /foo.rs
+            <|>// empty
+            ",
+        );
+        let nav = analysis.parent_module(pos).unwrap().pop().unwrap();
+        nav.assert_match("foo SOURCE_FILE FileId(2) [0; 10)");
+    }
+
+    #[test]
+    fn test_resolve_parent_module_for_inline() {
+        let (analysis, pos) = analysis_and_position(
+            "
+            //- /lib.rs
+            mod foo {
+                mod bar {
+                    mod baz { <|> }
+                }
+            }
+            ",
+        );
+        let nav = analysis.parent_module(pos).unwrap().pop().unwrap();
+        nav.assert_match("baz MODULE FileId(1) [32; 44)");
+    }
+}