add spec for family

spec/models/family_spec.rb

@@ -0,0 +1,33 @@
+RSpec.describe Family, type: :model do
+  describe '#trefle_data' do
+    before(:each) do
+      stub_request(:get, "https://trefle.io/api/v1/families/familyone")
+        .to_return(status: 404, body: '{}', headers: { 'Content-Type' => 'application/json' })
+    end
+
+    subject { Family.first.trefle_data }
+
+    it do
+      expect(subject).to be_instance_of(Hash)
+      expect(
+        a_request(:get, "https://trefle.io/api/v1/families/familyone")
+      ).to have_been_made
+    end
+  end
+
+  describe '#genera' do
+    subject { Family.first.genera }
+
+    it do
+      expect(subject).to all(be_instance_of(Genus))
+    end
+  end
+
+  describe '#plants' do
+    subject { Family.first.plants }
+
+    it do
+      expect(subject).to all(be_instance_of(Plant))
+    end
+  end
+end