Add some tests for unsuccessful registration

test/features/registration_test.exs

@@ -1,7 +1,7 @@
 defmodule Chess.RegistrationTest do
   use ChessWeb.FeatureCase
 
-  import Wallaby.Query, only: [text_field: 1, link: 1, button: 1]
+  import Wallaby.Query
 
   test "user can register", %{session: session} do
     session
@@ -14,4 +14,46 @@ defmodule Chess.RegistrationTest do
 
     assert session |> has_text?("Registered successfully")
   end
+
+  test "user cannot register without a name", %{session: session} do
+    session
+    |> visit("/")
+    |> click(link("Register"))
+    |> fill_in(text_field("Email"), with: "link@example.com")
+    |> fill_in(text_field("Password"), with: "ilovezelda")
+    |> click(button("Register"))
+
+    session
+    |> assert_has(
+      css("[data-role='name-error']", text: "can't be blank")
+    )
+  end
+
+  test "user cannot register without an email", %{session: session} do
+    session
+    |> visit("/")
+    |> click(link("Register"))
+    |> fill_in(text_field("Name"), with: "Link")
+    |> fill_in(text_field("Password"), with: "ilovezelda")
+    |> click(button("Register"))
+
+    session
+    |> assert_has(
+      css("[data-role='email-error']", text: "can't be blank")
+    )
+  end
+
+  test "user cannot register without a password", %{session: session} do
+    session
+    |> visit("/")
+    |> click(link("Register"))
+    |> fill_in(text_field("Name"), with: "Link")
+    |> fill_in(text_field("Email"), with: "link@example.com")
+    |> click(button("Register"))
+
+    session
+    |> assert_has(
+      css("[data-role='password-error']", text: "can't be blank")
+    )
+  end
 end