3 files changed, 43 insertions, 1 deletions

diff --git a/crates/ra_db/Cargo.toml b/crates/ra_db/Cargo.toml
index 3394ae8ce..bf1f7920c 100644
--- a/crates/ra_db/Cargo.toml
+++ b/crates/ra_db/Cargo.toml
@@ -12,3 +12,4 @@ rustc-hash = "1.0"
 ra_syntax = { path = "../ra_syntax" }
 ra_cfg = { path = "../ra_cfg" }
 ra_prof = { path = "../ra_prof" }
+test_utils = { path = "../test_utils" }
diff --git a/crates/ra_db/src/fixture.rs b/crates/ra_db/src/fixture.rs
new file mode 100644
index 000000000..469251fe9
--- /dev/null
+++ b/crates/ra_db/src/fixture.rs
@@ -0,0 +1,40 @@
+//! FIXME: write short doc here
+
+use std::sync::Arc;
+
+use ra_cfg::CfgOptions;
+
+use crate::{
+    CrateGraph, Edition, FileId, RelativePathBuf, SourceDatabaseExt, SourceRoot, SourceRootId,
+};
+
+pub const WORKSPACE: SourceRootId = SourceRootId(0);
+
+pub trait WithFixture: Default + SourceDatabaseExt + 'static {
+    fn with_single_file(text: &str) -> (Self, FileId) {
+        let mut db = Self::default();
+        let file_id = with_single_file(&mut db, text);
+        (db, file_id)
+    }
+}
+
+impl<DB: SourceDatabaseExt + Default + 'static> WithFixture for DB {}
+
+fn with_single_file(db: &mut dyn SourceDatabaseExt, text: &str) -> FileId {
+    let file_id = FileId(0);
+    let rel_path: RelativePathBuf = "/main.rs".into();
+
+    let mut source_root = SourceRoot::default();
+    source_root.insert_file(rel_path.clone(), file_id);
+
+    let mut crate_graph = CrateGraph::default();
+    crate_graph.add_crate_root(file_id, Edition::Edition2018, CfgOptions::default());
+
+    db.set_file_text(file_id, Arc::new(text.to_string()));
+    db.set_file_relative_path(file_id, rel_path);
+    db.set_file_source_root(file_id, WORKSPACE);
+    db.set_source_root(WORKSPACE, Arc::new(source_root));
+    db.set_crate_graph(Arc::new(crate_graph));
+
+    file_id
+}
diff --git a/crates/ra_db/src/lib.rs b/crates/ra_db/src/lib.rs
index 0d1ab4843..b6bfd531d 100644
--- a/crates/ra_db/src/lib.rs
+++ b/crates/ra_db/src/lib.rs
@@ -1,17 +1,18 @@
 //! ra_db defines basic database traits. The concrete DB is defined by ra_ide_api.
 mod cancellation;
 mod input;
+pub mod fixture;
 
 use std::{panic, sync::Arc};
 
 use ra_prof::profile;
 use ra_syntax::{ast, Parse, SourceFile, TextRange, TextUnit};
-use relative_path::{RelativePath, RelativePathBuf};
 
 pub use crate::{
     cancellation::Canceled,
     input::{CrateGraph, CrateId, Dependency, Edition, FileId, SourceRoot, SourceRootId},
 };
+pub use relative_path::{RelativePath, RelativePathBuf};
 pub use salsa;
 
 pub trait CheckCanceled {