Test breadcrumbs when coming from GTL page

spec/controllers/mixins/breadcrumbs_mixin_spec.rb

@@ -66,6 +66,7 @@ class TestMixin < ApplicationController
     allow(mixin_explorer).to receive(:x_active_tree).and_return(:active_tree)
     allow(mixin_explorer).to receive(:gtl_url).and_return("/show")
     mixin_explorer.instance_variable_set(:@sb, {})
+    allow(mixin).to receive(:params).and_return({})
 
     allow(mixin).to receive(:breadcrumbs_options).and_return(:breadcrumbs => [
                                                                {:title => _("First Layer")},
@@ -213,6 +214,17 @@ class TestMixin < ApplicationController
         expect(mixin.special_page_breadcrumb(mixin.instance_variable_get(:@tagitems))).to eq(nil)
       end
     end
+
+    context "when coming from GTL page" do
+      before do
+        mixin.instance_variable_set(:@tagitems, [{:id => "1789", :description => "item"}])
+        allow(mixin).to receive(:params).and_return({:miq_grid_checks => "42"})
+      end
+
+      it "returns nil" do
+        expect(mixin.special_page_breadcrumb(mixin.instance_variable_get(:@tagitems))).to eq(nil)
+      end
+    end
   end
 
   describe "#ancestry_parents" do