Add one failing and one succeeding test for references/3

test/elixir_sense/references_test.exs

@@ -3,6 +3,42 @@ defmodule ElixirSense.Providers.ReferencesTest do
 
   # doctest References
 
+  test "references function success" do
+    buffer = """
+    defmodule B.Callee do
+      def fun() do
+        :ok
+      end
+
+      def my_fun() do
+           ^
+        :ok
+      end
+    end
+    """
+
+    references = ElixirSense.references(buffer, 6, 7)
+    assert references != []
+  end
+
+  test "references function failure" do
+    buffer = """
+    defmodule B.Callee do
+      def fun() do
+           ^
+        :ok
+      end
+
+      def my_fun() do
+        :ok
+      end
+    end
+    """
+
+    references = ElixirSense.references(buffer, 2, 7)
+    assert references != []
+  end
+
   test "find references with cursor over a function call" do
     buffer = """
     defmodule Caller do

test/support/a.ex

@@ -0,0 +1,9 @@
+defmodule A do
+  def plain_fun do
+    B.Callee.fun()
+  end
+
+  def other_fun do
+    B.Callee.my_fun()
+  end
+end

test/support/b.ex

@@ -0,0 +1,9 @@
+defmodule B.Callee do
+  def fun() do
+    :ok
+  end
+
+  def my_fun() do
+    :ok
+  end
+end