5 files changed, 66 insertions, 44 deletions

diff --git a/crates/ra_ide_api/src/completion/complete_path.rs b/crates/ra_ide_api/src/completion/complete_path.rs
index 804954ee1..6bed299d2 100644
--- a/crates/ra_ide_api/src/completion/complete_path.rs
+++ b/crates/ra_ide_api/src/completion/complete_path.rs
@@ -121,30 +121,4 @@ mod tests {
             ",
         );
     }
-
-    #[test]
-    fn dont_render_function_parens_in_use_item() {
-        check_reference_completion(
-            "dont_render_function_parens_in_use_item",
-            "
-            //- /lib.rs
-            mod m { pub fn foo() {} }
-            use crate::m::f<|>;
-            ",
-        )
-    }
-
-    #[test]
-    fn dont_render_function_parens_if_already_call() {
-        check_reference_completion(
-            "dont_render_function_parens_if_already_call",
-            "
-            //- /lib.rs
-            fn frobnicate() {}
-            fn main() {
-                frob<|>();
-            }
-            ",
-        )
-    }
 }
diff --git a/crates/ra_ide_api/src/completion/complete_scope.rs b/crates/ra_ide_api/src/completion/complete_scope.rs
index 20fc77f06..f837bb1db 100644
--- a/crates/ra_ide_api/src/completion/complete_scope.rs
+++ b/crates/ra_ide_api/src/completion/complete_scope.rs
@@ -175,21 +175,4 @@ mod tests {
         check_reference_completion("self_in_methods", r"impl S { fn foo(&self) { <|> } }")
     }
 
-    #[test]
-    fn inserts_parens_for_function_calls() {
-        check_reference_completion(
-            "inserts_parens_for_function_calls1",
-            r"
-            fn no_args() {}
-            fn main() { no_<|> }
-            ",
-        );
-        check_reference_completion(
-            "inserts_parens_for_function_calls2",
-            r"
-            fn with_args(x: i32, y: String) {}
-            fn main() { with_<|> }
-            ",
-        );
-    }
 }
diff --git a/crates/ra_ide_api/src/completion/completion_item.rs b/crates/ra_ide_api/src/completion/completion_item.rs
index 680fd8d1b..48be812a0 100644
--- a/crates/ra_ide_api/src/completion/completion_item.rs
+++ b/crates/ra_ide_api/src/completion/completion_item.rs
@@ -3,9 +3,10 @@ use hir::PerNs;
 use crate::completion::completion_context::CompletionContext;
 use ra_syntax::{
     ast::{self, AstNode},
-    TextRange
+    TextRange,
 };
 use ra_text_edit::TextEdit;
+use test_utils::tested_by;
 
 /// `CompletionItem` describes a single completion variant in the editor pop-up.
 /// It is basically a POD with various properties. To construct a
@@ -255,6 +256,7 @@ impl Builder {
     ) -> Builder {
         // If not an import, add parenthesis automatically.
         if ctx.use_item_syntax.is_none() && !ctx.is_call {
+            tested_by!(inserts_parens_for_function_calls);
             if function.signature(ctx.db).params().is_empty() {
                 self.insert_text = Some(format!("{}()$0", self.label));
             } else {
@@ -344,3 +346,60 @@ pub(crate) fn check_completion(test_name: &str, code: &str, kind: CompletionKind
         .collect();
     assert_debug_snapshot_matches!(test_name, kind_completions);
 }
+
+#[cfg(test)]
+mod tests {
+    use test_utils::covers;
+
+    use super::*;
+
+    fn check_reference_completion(code: &str, expected_completions: &str) {
+        check_completion(code, expected_completions, CompletionKind::Reference);
+    }
+
+    #[test]
+    fn inserts_parens_for_function_calls() {
+        covers!(inserts_parens_for_function_calls);
+        check_reference_completion(
+            "inserts_parens_for_function_calls1",
+            r"
+            fn no_args() {}
+            fn main() { no_<|> }
+            ",
+        );
+        check_reference_completion(
+            "inserts_parens_for_function_calls2",
+            r"
+            fn with_args(x: i32, y: String) {}
+            fn main() { with_<|> }
+            ",
+        );
+    }
+
+    #[test]
+    fn dont_render_function_parens_in_use_item() {
+        check_reference_completion(
+            "dont_render_function_parens_in_use_item",
+            "
+            //- /lib.rs
+            mod m { pub fn foo() {} }
+            use crate::m::f<|>;
+            ",
+        )
+    }
+
+    #[test]
+    fn dont_render_function_parens_if_already_call() {
+        check_reference_completion(
+            "dont_render_function_parens_if_already_call",
+            "
+            //- /lib.rs
+            fn frobnicate() {}
+            fn main() {
+                frob<|>();
+            }
+            ",
+        )
+    }
+
+}
diff --git a/crates/ra_ide_api/src/lib.rs b/crates/ra_ide_api/src/lib.rs
index 3c53e75ac..3502bfd2e 100644
--- a/crates/ra_ide_api/src/lib.rs
+++ b/crates/ra_ide_api/src/lib.rs
@@ -26,6 +26,9 @@ mod syntax_highlighting;
 mod parent_module;
 mod rename;
 
+#[cfg(test)]
+mod marks;
+
 use std::{fmt, sync::Arc};
 
 use ra_syntax::{SourceFile, TreeArc, TextRange, TextUnit};
diff --git a/crates/ra_ide_api/src/marks.rs b/crates/ra_ide_api/src/marks.rs
new file mode 100644
index 000000000..b4a726ef0
--- /dev/null
+++ b/crates/ra_ide_api/src/marks.rs
@@ -0,0 +1,3 @@
+use test_utils::mark;
+
+mark!(inserts_parens_for_function_calls);