diff --git a/crates/ra_analysis/src/mock_analysis.rs b/crates/ra_analysis/src/mock_analysis.rs
index 9605294046d..b37371499dd 100644
--- a/crates/ra_analysis/src/mock_analysis.rs
+++ b/crates/ra_analysis/src/mock_analysis.rs
@@ -55,6 +55,26 @@ pub fn with_files_and_position(fixture: &str) -> (MockAnalysis, FilePosition) {
         (res, position)
     }
 
+    /// Same as `with_files`, but requires that a single file contains two `<|>` marker,
+    /// whose range is also returned.
+    pub fn with_files_and_range(fixture: &str) -> (MockAnalysis, FileRange) {
+        let mut range = None;
+        let mut res = MockAnalysis::new();
+        for entry in parse_fixture(fixture) {
+            if entry.text.contains(CURSOR_MARKER) {
+                assert!(
+                    range.is_none(),
+                    "only two marker (<|>) per fixture is allowed"
+                );
+                range = Some(res.add_file_with_range(&entry.meta, &entry.text));
+            } else {
+                res.add_file(&entry.meta, &entry.text);
+            }
+        }
+        let range = range.expect("expected two marker (<|>)");
+        (res, range)
+    }
+
     pub fn add_file(&mut self, path: &str, text: &str) -> FileId {
         let file_id = FileId((self.files.len() + 1) as u32);
         self.files.push((path.to_string(), text.to_string()));
@@ -102,12 +122,18 @@ pub fn analysis(self) -> Analysis {
     }
 }
 
-/// Creates analysis from a multi-file fixture, returns positions marked with <|>.
+/// Creates analysis from a multi-file fixture, returns positions marked with a <|>.
 pub fn analysis_and_position(fixture: &str) -> (Analysis, FilePosition) {
     let (mock, position) = MockAnalysis::with_files_and_position(fixture);
     (mock.analysis(), position)
 }
 
+/// Creates analysis from a multi-file fixture, returns ranges marked with two <|>.
+pub fn analysis_and_range(fixture: &str) -> (Analysis, FileRange) {
+    let (mock, range) = MockAnalysis::with_files_and_range(fixture);
+    (mock.analysis(), range)
+}
+
 /// Creates analysis for a single file.
 pub fn single_file(code: &str) -> (Analysis, FileId) {
     let mut mock = MockAnalysis::new();
diff --git a/crates/ra_analysis/tests/tests.rs b/crates/ra_analysis/tests/tests.rs
index 3045c2e781f..ce6f6f3faea 100644
--- a/crates/ra_analysis/tests/tests.rs
+++ b/crates/ra_analysis/tests/tests.rs
@@ -2,7 +2,7 @@
 use test_utils::{assert_eq_dbg, assert_eq_text};
 
 use ra_analysis::{
-    mock_analysis::{analysis_and_position, single_file, single_file_with_position, MockAnalysis},
+    mock_analysis::{analysis_and_position, analysis_and_range, single_file, single_file_with_position, MockAnalysis},
     AnalysisChange, CrateGraph, FileId, FnSignatureInfo,
 };
 
@@ -10,6 +10,22 @@ fn get_signature(text: &str) -> (FnSignatureInfo, Option<usize>) {
     let (analysis, position) = single_file_with_position(text);
     analysis.resolve_callable(position).unwrap().unwrap()
 }
+#[test]
+fn test_type_of() {
+    let (analysis, range) = analysis_and_range(
+        "
+        //- /lib.rs
+        pub fn foo() -> u32 {
+            1
+        };
+
+        let <|>foo_test<|> = foo();
+    ",
+    );
+
+    let type_name = analysis.type_of(range).unwrap().unwrap();
+    assert_eq_dbg("u32", &type_name);
+}
 
 #[test]
 fn approximate_resolve_works_in_items() {