Added backtrace formatter test.

tests/Formatter/BacktraceTest.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace Rarst\Laps\Tests\Formatter;
+
+use Brain\Monkey\Functions;
+use Rarst\Laps\Formatter\Backtrace_Formatter;
+use Rarst\Laps\Tests\LapsTestCase;
+
+/**
+ * @coversDefaultClass Rarst\Laps\Formatter\Backtrace_Formatter
+ */
+class BacktraceTest extends LapsTestCase {
+
+	/**
+	 * @covers ::__construct
+	 *
+	 * @return Backtrace_Formatter
+	 */
+	public function test__construct() {
+
+		if ( ! defined( 'ABSPATH' ) ) {
+			define( 'ABSPATH', '/wp' );
+			define( 'WP_CONTENT_DIR', '/wp-content/' );
+		}
+
+		Functions\expect( 'wp_normalize_path' )->zeroOrMoreTimes()->andReturnFirstArg();
+
+		return new Backtrace_Formatter();
+	}
+
+	/**
+	 * @depends test__construct
+	 */
+	public function testFormat( Backtrace_Formatter $formatter ) {
+
+		if ( ! defined( 'ABSPATH' ) ) {
+			define( 'ABSPATH', '/wp' );
+			define( 'WP_CONTENT_DIR', '/wp-content/' );
+		}
+
+		Functions\expect( 'wp_normalize_path' )->zeroOrMoreTimes()->andReturnFirstArg();
+
+		$backtrace = [
+			'template-loader.php',
+			'WP_Hook->do_action',
+			'foo',
+			"include('/wp/path.php')",
+		];
+
+		$backtrace = implode( ', ', $backtrace );
+
+		$result = $formatter->format( $backtrace );
+
+		$this->assertInternalType( 'array', $result );
+		$this->assertArraySubset( [ 'foo', 'path.php' ], array_values( $result ) );
+	}
+}
+