Add shoulda matchers in Technology model

spec/models/technology_spec.rb

@@ -4,29 +4,21 @@
 
 RSpec.describe(Technology, type: :model) do
   require_factories
-  describe "attributes" do
-    it "accepts all valid attributes" do
-      technology = Technology.new(
-        name: "Ruby",
-        background_color: "#FF0000",
-        text_color: "#FFFFFF",
-      )
-      expect(technology).to(be_valid)
-    end
+  require_shoulda_matchers
 
-    it "throws an error if name is not present" do
-      technology = build(:technology, name: nil)
-      expect(technology).to_not(be_valid)
-      expect(technology.errors[:name]).to(be_present)
-    end
+  describe "validations" do
+    subject { build(:technology) }
+
+    it { is_expected.to(validate_presence_of(:name)) }
+    it { is_expected.to(validate_uniqueness_of(:name)) }
 
-    it "throws an error if background_color is not a valid hex color code" do
+    it "returns a validation error if background_color is not a valid hex color code" do
       technology = build(:technology, background_color: "invalid")
       expect(technology).to_not(be_valid)
       expect(technology.errors[:background_color]).to(be_present)
     end
 
-    it "throws an error if text_color is not a valid hex color code" do
+    it "returns a validation error if text_color is not a valid hex color code" do
       technology = build(:technology, text_color: "invalid")
       expect(technology).to_not(be_valid)
       expect(technology.errors[:text_color]).to(be_present)