Fix Spec for unquote in def name

Refs #1114

lib/credo/check/readability/specs.ex

@@ -110,6 +110,12 @@ defmodule Credo.Check.Readability.Specs do
   end
 
   defp issue_for(issue_meta, line_no, trigger) do
+    trigger = if is_tuple(trigger) do
+      Macro.to_string(trigger)
+    else
+      trigger
+    end
+
     format_issue(
       issue_meta,
       message: "Functions should have a @spec type specification.",

test/credo/check/readability/specs_test.exs

@@ -125,6 +125,7 @@ defmodule Credo.Check.Readability.SpecsTest do
     |> refute_issues()
   end
 
+
   #
   # cases raising issues
   #
@@ -195,4 +196,21 @@ defmodule Credo.Check.Readability.SpecsTest do
       assert issue.trigger == "foo"
     end)
   end
+
+  test "it should report/not crash for unquote/1 calls in the function name" do
+    ~S"""
+    defmodule SpecIssue do
+      function_name = :do_something
+
+      def unquote(function_name)() do
+        :ok
+      end
+    end
+    """
+    |> to_source_file()
+    |> run_check(@described_check)
+    |> assert_issue(fn issue ->
+      assert issue.trigger == "unquote(function_name)"
+    end)
+  end
 end