diff --git a/spec/postnord/config_spec.rb b/spec/postnord/config_spec.rb
new file mode 100644
index 0000000..4187c98
--- /dev/null
+++ b/spec/postnord/config_spec.rb
@@ -0,0 +1,57 @@
+require 'spec_helper'
+
+RSpec.describe Postnord::Config do
+
+  context 'without global config variables' do
+
+    context 'api_key' do
+      it { expect(described_class.api_key).to eq('') }
+    end
+
+    context 'api_version' do
+      it { expect(described_class.api_version).to eq('v1') }
+    end
+
+    context 'api_endpoint' do
+      it { expect(described_class.api_endpoint).to eq('https://api2.postnord.com/rest') }
+    end
+
+    context 'locale' do
+      it { expect(described_class.locale).to eq('en') }
+    end
+
+    context 'return_type' do
+      it { expect(described_class.return_type).to eq('json') }
+    end
+  end
+
+  context 'with global config variables' do
+    before :all do
+      POSTNORD_API_KEY = '12345'
+      POSTNORD_API_VERSION = 'v2'
+      POSTNORD_API_ENDPOINT = 'http://newurl.com/'
+      POSTNORD_LOCALE = 'sv'
+      POSTNORD_RETURN_TYPE = 'xml'
+    end
+
+    context 'api_key' do
+      it { expect(described_class.api_key).to eq(POSTNORD_API_KEY) }
+    end
+
+    context 'api_version' do
+      it { expect(described_class.api_version).to eq(POSTNORD_API_VERSION) }
+    end
+
+    context 'api_endpoint' do
+      it { expect(described_class.api_endpoint).to eq(POSTNORD_API_ENDPOINT) }
+    end
+
+    context 'locale' do
+      it { expect(described_class.locale).to eq(POSTNORD_LOCALE) }
+    end
+
+    context 'return_type' do
+      it { expect(described_class.return_type).to eq(POSTNORD_RETURN_TYPE) }
+    end
+  end
+end