diff --git a/spec/lib/open_project/design_spec.rb b/spec/lib/open_project/design_spec.rb
deleted file mode 100644
index 84e7096e18..0000000000
--- a/spec/lib/open_project/design_spec.rb
+++ /dev/null
@@ -1,60 +0,0 @@
-#-- copyright
-# OpenProject is an open source project management software.
-# Copyright (C) 2012-2020 the OpenProject GmbH
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License version 3.
-#
-# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
-# Copyright (C) 2006-2017 Jean-Philippe Lang
-# Copyright (C) 2010-2013 the ChiliProject Team
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
-#
-# See docs/COPYRIGHT.rdoc for more details.
-#++
-
-require 'spec_helper'
-
-describe OpenProject::CustomStyles::Design do
-  it 'detects variable names in strings' do
-    expect('$bla' =~ described_class::VARIABLE_NAME_RGX).to be_truthy
-    expect('$bla-asdf' =~ described_class::VARIABLE_NAME_RGX).to be_truthy
-    expect('$bla-asdf-12' =~ described_class::VARIABLE_NAME_RGX).to be_truthy
-    expect('$bla-asdf12' =~ described_class::VARIABLE_NAME_RGX).to be_truthy
-    expect('$12' =~ described_class::VARIABLE_NAME_RGX).to be_truthy
-    expect('12' =~ described_class::VARIABLE_NAME_RGX).to be_falsey
-    expect('asdf' =~ described_class::VARIABLE_NAME_RGX).to be_falsey
-    expect('bla $blub' =~ described_class::VARIABLE_NAME_RGX).to be_truthy
-    expect('bla($blub 1px)' =~ described_class::VARIABLE_NAME_RGX).to be_truthy
-  end
-
-  context 'default variables set' do
-    before do
-      stub_const("OpenProject::CustomStyles::Design::DEFAULTS",
-                 'variable_1' => 'one',
-                 'variable_2' => 'two',
-                 'variable_1_2' => 'foo $variable_1 bar $variable_2')
-    end
-
-    it '#resolved_variables' do
-      expect(described_class.resolved_variables).to be_eql(
-        'variable_1' => 'one',
-        'variable_2' => 'two',
-        'variable_1_2' => 'foo one bar two'
-      )
-    end
-  end
-end
diff --git a/spec/models/design_color_spec.rb b/spec/models/design_color_spec.rb
index 54be9bbeab..15afb0fa94 100644
--- a/spec/models/design_color_spec.rb
+++ b/spec/models/design_color_spec.rb
@@ -4,13 +4,6 @@ RSpec.describe DesignColor, type: :model do
   let(:default_primary) { ::OpenProject::CustomStyles::Design.variables['primary-color'] }
   let(:primary_color) { FactoryBot.create :"design_color_primary-color" }
 
-  describe "#defaults" do
-    it "returns a hash of default color variables with hex color codes" do
-      expect(described_class.defaults).to be_a(Hash)
-      expect(described_class.defaults["primary-color"]).to eq(default_primary)
-    end
-  end
-
   describe "#setables" do
     it "returns an Array of instances" do
       expect(described_class.setables).to be_a(Array)
@@ -36,7 +29,7 @@ RSpec.describe DesignColor, type: :model do
 
     it "returns nil hexcode if hexcode not present" do
       expect(described_class.new(variable: "primary-color").hexcode)
-        .to be_Nil
+        .to eq nil
     end
   end