Add instagram handler validator

update entreprise model to match the correct pattern for instagram attribute & add migration to correct wrong links in db + test

spec/models/enterprise_spec.rb

@@ -155,6 +155,94 @@ describe Enterprise do
       end
     end
 
+    describe "prevent a wrong instagram link pattern" do
+      it "invalidates the instagram attribute https://facebook.com/user" do
+        e = build(:enterprise, instagram: 'https://facebook.com/user')
+        expect(e).to_not be_valid
+      end
+
+      it "invalidates the instagram attribute tagram.com/user" do
+        e = build(:enterprise, instagram: 'tagram.com/user')
+        expect(e).to_not be_valid
+      end
+
+      it "invalidates the instagram attribute https://instagram.com/user/preferences" do
+        e = build(:enterprise, instagram: 'https://instagram.com/user/preferences')
+        expect(e).to_not be_valid
+      end
+
+      it "invalidates the instagram attribute https://instagram.com/user/" do
+        e = build(:enterprise, instagram: 'https://instagram.com/user/')
+        expect(e).to_not be_valid
+      end
+
+      it "invalidates the instagram attribute https://instagram.com/user-user" do
+        e = build(:enterprise, instagram: 'https://instagram.com/user-user')
+        expect(e).to_not be_valid
+      end
+    end
+
+    describe "Verify accepted instagram url pattern" do
+      it "validates empty instagram attribute" do
+        e = build(:enterprise, instagram: '')
+        expect(e).to be_valid
+        expect(e.instagram).to eq ""
+      end
+
+      it "validates the instagram attribute @my_user" do
+        e = build(:enterprise, instagram: '@my_user')
+        expect(e).to be_valid
+        expect(e.instagram).to eq "my_user"
+      end
+
+      it "validates the instagram attribute user" do
+        e = build(:enterprise, instagram: 'user')
+        expect(e).to be_valid
+        expect(e.instagram).to eq "user"
+      end
+
+      it "validates the instagram attribute my_www5.example" do
+        e = build(:enterprise, instagram: 'my_www5.example')
+        expect(e).to be_valid
+        expect(e.instagram).to eq "my_www5.example"
+      end
+
+      it "validates the instagram attribute http://instagram.com/user" do
+        e = build(:enterprise, instagram: 'http://instagram.com/user')
+        expect(e).to be_valid
+        expect(e.instagram).to eq "user"
+      end
+
+      it "validates the instagram attribute https://www.instagram.com/user" do
+        e = build(:enterprise, instagram: 'https://www.instagram.com/user')
+        expect(e).to be_valid
+        expect(e.instagram).to eq "user"
+      end
+
+      it "validates the instagram attribute instagram.com/@user" do
+        e = build(:enterprise, instagram: 'instagram.com/@user')
+        expect(e).to be_valid
+        expect(e.instagram).to eq "user"
+      end
+
+      it "validates the instagram attribute Https://www.Instagram.com/@User" do
+        e = build(:enterprise, instagram: 'Https://www.Instagram.com/@User')
+        expect(e).to be_valid
+        expect(e.instagram).to eq "user"
+      end
+
+      it "validates the instagram attribute instagram.com/user" do
+        e = build(:enterprise, instagram: 'instagram.com/user')
+        expect(e).to be_valid
+        expect(e.instagram).to eq "user"
+      end
+
+      it "renders the expected pattern" do
+        e = build(:enterprise, instagram: 'instagram.com/user')
+        expect(e.instagram).to eq "user"
+      end
+    end
+
     describe "preferred_shopfront_taxon_order" do
       it "empty strings are valid" do
         enterprise = build(:enterprise, preferred_shopfront_taxon_order: "")