為什么這個簡單的minitest失敗了？

Question

我是測試Rails應用程序的新手，因為我通常只是做手動測試...但是這次我正嘗試以正確的方式來做。

為什么此基本測試失敗？

test "once you go to to app you are asked to sign in" do
  get "/"
  assert_redirected_to "/users/sign_in"
  assert_select "title", "Home Sign-In"
end

第一個斷言是成功的，但第二個則不成功。 當我查看源代碼時，標題似乎正確。

<title>Home Sign-In</title>

Answer 1

如果您的控制器方法中有重定向調用，則它不是實際呈現的。 這就是為什么您不能使用assert_select的原因。

您可以嘗試將測試用例分為兩部分：

test "once you go to to app you are asked to sign in" do
  get "/"
  assert_redirected_to "/users/sign_in"
end

test "sign in page title is correct" do
  get "/users/sign_in"
  assert_select "title", "Home Sign-In"
end

Answer 2

@Pavel是正確的。 獲取請求后檢查響應的簡單方法是@ response.body 。 所以你的情況

test "once you go to to app you are asked to sign in" do
  get "/"
  assert_redirected_to "/users/sign_in"
  byebug #print @response.body here. At this point @response.body will
  # be "You are being redirected to /users/sign_in".
  assert_select "title", "Home Sign-In"
 end

因此您可以按照Pavel的建議進行修改

test "sign in page title is correct" do
  get "/users/sign_in"
  assert_select "title", "Home Sign-In"
end