Add oncePerNode() test

tests/joy/OncePerNodeTest.php

@@ -0,0 +1,25 @@
+<?php
+/* (c) Anton Medvedev <anton@medv.io>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Deployer;
+
+class OncePerNodeTest extends AbstractTest
+{
+    const RECIPE = __DIR__ . '/recipe/once_per_node.php';
+
+    public function testOnce()
+    {
+        $this->dep(self::RECIPE, 'test_once_per_node');
+
+        $display = $this->tester->getDisplay();
+        self::assertEquals(0, $this->tester->getStatusCode(), $display);
+        self::assertStringContainsString('alias: group_a_1 hostname: localhost', $display);
+        self::assertStringNotContainsString('alias: group_a_2 hostname: localhost', $display);
+        self::assertStringContainsString('alias: group_b_1 hostname: group_b_1', $display);
+        self::assertStringNotContainsString('alias: group_b_2 hostname: group_b_2', $display);
+    }
+}

tests/joy/recipe/once_per_node.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Deployer;
+
+localhost('group_a_1')
+    ->setHostname('localhost');
+localhost('group_a_2')
+    ->setHostname('localhost');
+localhost('group_b_1')
+    ->setLabels(['node' => 'anna']);
+localhost('group_b_2')
+    ->setLabels(['node' => 'anna']);
+
+task('test_once_per_node', function () {
+    writeln('alias: {{alias}} hostname: {{hostname}}');
+})->oncePerNode();