From c12ffe0b373bc86f3cc01da10701d7907f987b57 Mon Sep 17 00:00:00 2001
From: PCF <32403010+pcf0@users.noreply.github.com>
Date: Sat, 30 Sep 2017 02:46:49 +0200
Subject: [PATCH] TestCase for BadConfigurationException in BigInteger

---
 tests/Unit/Math/BigIntegerTest.php | 69 ++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 tests/Unit/Math/BigIntegerTest.php

diff --git a/tests/Unit/Math/BigIntegerTest.php b/tests/Unit/Math/BigIntegerTest.php
new file mode 100644
index 00000000..191be626
--- /dev/null
+++ b/tests/Unit/Math/BigIntegerTest.php
@@ -0,0 +1,69 @@
+<?php
+use phpseclib\Math\BigInteger;
+use phpseclib\Math\BigInteger\Engines\BCMath;
+use phpseclib\Math\BigInteger\Engines\GMP;
+use phpseclib\Math\BigInteger\Engines\PHP32;
+use phpseclib\Math\BigInteger\Engines\PHP64;
+
+class Unit_Math_BigIntegerTest extends PhpseclibTestCase
+{
+
+	/**
+	 * @param string $className
+	 * @param bool   $isValid
+	 */
+	private static function mockEngine($className, $isValid) {
+		eval(<<<ENGINE
+namespace phpseclib\Math\BigInteger\Engines;
+class ${className} extends \phpseclib\Math\BigInteger\Engines\Engine {
+	public function __construct(){} 
+	public static function isValidEngine() { return ${isValid}; }
+	public static function setModExpEngine(\$engine){} 
+	public function toString() { return __CLASS__; }
+}
+ENGINE
+		);
+	}
+
+	public static function provideBadConfigurationException() {
+		return [
+			[
+				GMP::class,
+				['GMP', true],
+			],
+			[
+				PHP64::class,
+				['GMP', false],
+				['PHP64', true],
+			],
+			[
+				BCMath::class,
+				['GMP', false],
+				['PHP64', false],
+				['BCMath', true],
+			],
+			[
+				PHP32::class,
+				['GMP', false],
+				['PHP64', false],
+				['BCMath', false],
+				['PHP32', true],
+			],
+		];
+	}
+
+	/**
+	 * BigInteger should choose another engine if one is not valid
+	 * @dataProvider         provideBadConfigurationException
+	 * @runInSeparateProcess mocks must not disturb other tests
+	 */
+	public function testBadConfigurationException($expectedClass, ...$engines) {
+		foreach ($engines as $engine) {
+			static::mockEngine($engine[0], $engine[1]);
+		}
+
+		$bigint = new BigInteger();
+
+		static::assertSame($expectedClass, $bigint->toString());
+	}
+}