Add GenerateFiltersTest

tests/Unit/Console/Command/GenerateFiltersTest.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace Opdavies\Tests\GmailFilterBuilder\Console\Command;
+
+use Opdavies\GmailFilterBuilder\Console\Command\GenerateCommand;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Console\Tester\CommandTester;
+use Symfony\Component\Filesystem\Filesystem;
+
+class GenerateFiltersTest extends TestCase
+{
+    const INPUT_FILENAME = __DIR__ . '/../../../fixtures/simple/input.php';
+    const OUTPUT_FILENAME = 'test-output.xml';
+
+    /** @var CommandTester */
+    private $commandTester;
+
+    /** @var Filesystem */
+    private $fs;
+
+    protected function setUp()
+    {
+        parent::setUp();
+
+        $this->commandTester = new CommandTester(new GenerateCommand());
+        $this->fs = new Filesystem();
+    }
+
+    protected function tearDown()
+    {
+        // Ensure that files generated during tests are removed to prevent
+        // failures on future runs.
+        $this->fs->remove([self::OUTPUT_FILENAME]);
+    }
+
+    /** @test */
+    public function it_converts_filters_from_php_to_xml()
+    {
+        $this->commandTester->execute([
+            '--input-file' => self::INPUT_FILENAME,
+            '--output-file' => self::OUTPUT_FILENAME,
+        ]);
+
+        $this->assertTrue($this->fs->exists(self::OUTPUT_FILENAME));
+
+        $expected = file_get_contents(__DIR__ . '/../../../fixtures/simple/output.xml');
+        $result = file_get_contents(self::OUTPUT_FILENAME);
+
+        $this->assertEquals(trim($expected), $result);
+    }
+}

tests/fixtures/simple/input.php

@@ -0,0 +1,9 @@
+<?php
+
+use Opdavies\GmailFilterBuilder\Model\Filter;
+
+return [
+    Filter::create()
+        ->from('example.com')
+        ->labelAndArchive('Test'),
+];