Add translation model tests

test/models/translation_test.rb

@@ -0,0 +1,41 @@
+require 'test_helper'
+
+module Moirai
+  class TranslationTest < ActiveSupport::TestCase
+    def setup
+      @valid_translation = Translation.new(key: 'hello', locale: 'en', file_path: '/valid/path/to/file')
+      @invalid_translation = Translation.new(key: 'hello', locale: 'en', file_path: '/invalid/path/to/file')
+    end
+
+    test "should be valid with valid attributes" do
+      File.stub :exist?, true do
+        assert @valid_translation.valid?
+      end
+    end
+
+    test "should be invalid without key" do
+      @valid_translation.key = nil
+      assert_not @valid_translation.valid?
+      assert_includes @valid_translation.errors[:key], "can't be blank"
+    end
+
+    test "should be invalid without locale" do
+      @valid_translation.locale = nil
+      assert_not @valid_translation.valid?
+      assert_includes @valid_translation.errors[:locale], "can't be blank"
+    end
+
+    test "should be invalid without file_path" do
+      @valid_translation.file_path = nil
+      assert_not @valid_translation.valid?
+      assert_includes @valid_translation.errors[:file_path], "can't be blank"
+    end
+
+    test "should be invalid if file_path does not exist" do
+      File.stub :exist?, false do
+        assert_not @invalid_translation.valid?
+        assert_includes @invalid_translation.errors[:file_path], "must exist"
+      end
+    end
+  end
+end