add Util tests

src/Conv/Util/FieldOrder.php

@@ -46,5 +46,4 @@ public function getNextAfterField()
     {
         return $this->nextAfterField;
     }
-
 }

tests/Conv/Util/FieldOrderTest.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Conv\Util;
+
+class FieldOrderTest extends \PHPUnit\Framework\TestCase
+{
+    public function testConstruct()
+    {
+        $field = 'user_name';
+        $previousAfterField = 'user_id';
+        $nextAfterField = 'age';
+        $fieldOrder = new FieldOrder($field, $previousAfterField, $nextAfterField);
+        $this->assertSame($field, $fieldOrder->getField());
+        $this->assertSame($previousAfterField, $fieldOrder->getPreviousAfterField());
+        $this->assertSame($nextAfterField, $fieldOrder->getNextAfterField());
+    }
+}

tests/Conv/Util/OperatorTest.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace Conv\Util;
+
+use Symfony\Component\Console\Helper\QuestionHelper;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Question\ChoiceQuestion;
+
+class OperatorTest extends \PHPUnit\Framework\TestCase
+{
+    private $prophet;
+
+    protected function setup()
+    {
+        $this->prophet = new \Prophecy\Prophet;
+    }
+
+    protected function tearDown()
+    {
+        $this->prophet->checkPredictions();
+    }
+
+    public function testConstruct()
+    {
+        $helper = $this->prophet->prophesize(QuestionHelper::class);
+        $input = $this->prophet->prophesize(InputInterface::class);
+        $output = $this->prophet->prophesize(OutputInterface::class);
+        $operator = new Operator($helper->reveal(), $input->reveal(), $output->reveal());
+
+        $answer = 'answer';
+        $helper->ask($input, $output, \Prophecy\Argument::type(ChoiceQuestion::class))
+            ->willReturn($answer)
+            ->shouldBeCalledTimes(1);
+        $this->assertSame($answer, $operator->choiceQuestion('question', ['answer']));
+
+        $message = 'message';
+        $output->writeln($message)->shouldBeCalledTimes(1);
+        $operator->output($message);
+    }
+}