Rename Problem to Translation

test/models/translation_test.rb

@@ -0,0 +1,34 @@
+require 'test_helper'
+
+class TranslationTest < ActiveSupport::TestCase
+  test "should not save translation without title" do
+    translation = Translation.new(content: 'This is some content')
+    assert_not translation.save
+  end
+
+  test "should not save translation without content" do
+    translation = Translation.new(title: 'Translation title')
+    assert_not translation.save
+  end
+
+  test "should not save translation with duplicate title" do
+    translation = Translation.new(
+        title: translations(:one).title,
+        content: 'This is some content'
+    )
+    assert_not translation.save
+  end
+
+  test "should save correct translation" do
+    translation = Translation.new(
+        title: 'A unique title',
+        content: 'Some content'
+    )
+    assert translation.save
+  end
+
+  test "should have correct original url" do
+    first = Translation.first
+    assert_equal "https://projecteuler.net/problem=#{first.id}", first.original_url
+  end
+end