Add test coverage

tests/phpunit/data/blocks/notice/variations.php

@@ -0,0 +1,10 @@
+<?php
+
+return array(
+	array(
+		'name'        => 'warning',
+		'title'       => 'warning',
+		'description' => 'Shows warning.',
+		'keywords'    => array( 'warning' )
+	)
+);

tests/phpunit/tests/blocks/register.php

@@ -957,6 +957,39 @@ public function data_register_block_registers_with_args_override_returns_false_w
 		);
 	}
 
+	/**
+	 * Tests registering a block with variations from a PHP file.
+	 *
+	 * @ticket 61280
+	 *
+	 * @covers ::register_block_type_from_metadata
+	 */
+	public function test_register_block_type_from_metadata_with_variations_php_file() {
+		$result = register_block_type_from_metadata(
+			DIR_TESTDATA . '/blocks/notice',
+			array(
+				'api_version' => 2,
+				'name'        => 'tests/notice-with-variations-php',
+				'title'       => 'Notice with variations from a PHP file',
+				'variations'  => 'variations.php'
+			)
+		);
+
+		$this->assertInstanceOf( 'WP_Block_Type', $result, 'The block was not registered' );
+		$this->assertSame( 2, $result->api_version, 'The API version is incorrect' );
+		$this->assertSame( 'tests/notice-with-variations-php', $result->name, 'The block name is incorrect' );
+		$this->assertSame( 'Notice with variations from a PHP file', $result->title, 'The block title is incorrect' );
+		$this->assertSame( 'variations.php', $result->variations, 'The block variations are incorrect' );
+		$this->assertIsCallable( $result->variation_callback, 'The variation callback hasn\'t been set' );
+
+		$expected_variations = require DIR_TESTDATA . '/blocks/notice/variations.php';
+		$this->assertSame(
+			$expected_variations,
+			call_user_func( $result->variation_callback ),
+			'The variation callback hasn\'t been set correctly'
+		);
+	}
+
 	/**
 	 * Tests that the function returns the registered block when the `block.json`
 	 * is found in the fixtures directory.