Add simple unit test for API fact override

Author: Kevin Paulisse

spec/octocatalog-diff/tests/api/v1/fact_override_spec.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+require_relative '../../spec_helper'
+
+require OctocatalogDiff::Spec.require_path('/api/v1/fact_override')
+
+describe OctocatalogDiff::API::V1::FactOverride do
+  describe '#new' do
+    it 'should raise error if key is not supplied' do
+      expect { described_class.new(value: 'bar') }.to raise_error(KeyError, /key/)
+    end
+
+    it 'should raise error if value is not supplied' do
+      expect { described_class.new(key: 'bar') }.to raise_error(KeyError, /value/)
+    end
+  end
+
+  describe '#key' do
+    it 'should return key' do
+      testobj = described_class.new(key: 'foo', value: 'bar')
+      expect(testobj.key).to eq('foo')
+    end
+  end
+
+  describe '#value' do
+    it 'should return value' do
+      testobj = described_class.new(key: 'foo', value: 'bar')
+      expect(testobj.value).to eq('bar')
+    end
+  end
+end