1 files changed, 43 insertions, 0 deletions

diff --git a/crates/ra_assists/src/test_db.rs b/crates/ra_assists/src/test_db.rs
new file mode 100644
index 000000000..7b196561a
--- /dev/null
+++ b/crates/ra_assists/src/test_db.rs
@@ -0,0 +1,43 @@
+use std::sync::Arc;
+
+use ra_db::{salsa, CrateId, FileId, FileLoader, FileLoaderDelegate, RelativePath};
+
+#[salsa::database(
+    ra_db::SourceDatabaseExtStorage,
+    ra_db::SourceDatabaseStorage,
+    hir::db::InternDatabaseStorage,
+    hir::db::AstDatabaseStorage,
+    hir::db::DefDatabaseStorage,
+    hir::db::DefDatabase2Storage,
+    hir::db::HirDatabaseStorage
+)]
+#[derive(Debug, Default)]
+pub struct TestDB {
+    runtime: salsa::Runtime<TestDB>,
+}
+
+impl salsa::Database for TestDB {
+    fn salsa_runtime(&self) -> &salsa::Runtime<Self> {
+        &self.runtime
+    }
+}
+
+impl std::panic::RefUnwindSafe for TestDB {}
+
+impl FileLoader for TestDB {
+    fn file_text(&self, file_id: FileId) -> Arc<String> {
+        FileLoaderDelegate(self).file_text(file_id)
+    }
+    fn resolve_relative_path(
+        &self,
+        anchor: FileId,
+        relative_path: &RelativePath,
+    ) -> Option<FileId> {
+        FileLoaderDelegate(self).resolve_relative_path(anchor, relative_path)
+    }
+    fn relevant_crates(&self, file_id: FileId) -> Arc<Vec<CrateId>> {
+        FileLoaderDelegate(self).relevant_crates(file_id)
+    }
+}
+
+impl hir::debug::HirDebugHelper for TestDB {}