added the last two models

test/system/credentials_test.rb

@@ -0,0 +1,43 @@
+require "application_system_test_case"
+
+class CredentialsTest < ApplicationSystemTestCase
+  setup do
+    @credential = credentials(:one)
+  end
+
+  test "visiting the index" do
+    visit credentials_url
+    assert_selector "h1", text: "Credentials"
+  end
+
+  test "should create credential" do
+    visit credentials_url
+    click_on "New credential"
+
+    fill_in "Email", with: @credential.email
+    fill_in "Password", with: @credential.password
+    click_on "Create Credential"
+
+    assert_text "Credential was successfully created"
+    click_on "Back"
+  end
+
+  test "should update Credential" do
+    visit credential_url(@credential)
+    click_on "Edit this credential", match: :first
+
+    fill_in "Email", with: @credential.email
+    fill_in "Password", with: @credential.password
+    click_on "Update Credential"
+
+    assert_text "Credential was successfully updated"
+    click_on "Back"
+  end
+
+  test "should destroy Credential" do
+    visit credential_url(@credential)
+    click_on "Destroy this credential", match: :first
+
+    assert_text "Credential was successfully destroyed"
+  end
+end