TestProvider example

public function testCompiledEnumFunctionWithBackedEnum()
    {
        $result = null;
        $expressionLanguage = new ExpressionLanguage();
        eval(sprintf('$result = %s;', $expressionLanguage->compile('enum("Symfony\\\\Component\\\\ExpressionLanguage\\\\Tests\\\\Fixtures\\\\FooBackedEnum::Bar")')));

        $this->assertSame(FooBackedEnum::Bar, $result);
    }

    public function testProviders()
    {
        $expressionLanguage = new ExpressionLanguage(null, [new TestProvider()]);
        $this->assertEquals('foo', $expressionLanguage->evaluate('identity("foo")'));
        $this->assertEquals('"foo"', $expressionLanguage->compile('identity("foo")'));
        $this->assertEquals('FOO', $expressionLanguage->evaluate('strtoupper("foo")'));
        $this->assertEquals('\strtoupper("foo")', $expressionLanguage->compile('strtoupper("foo")'));
        $this->assertEquals('foo', $expressionLanguage->evaluate('strtolower("FOO")'));
        $this->assertEquals('\strtolower("FOO")', $expressionLanguage->compile('strtolower("FOO")'));
        $this->assertTrue($expressionLanguage->evaluate('fn_namespaced()'));
        $this->assertEquals('\Symfony\Component\ExpressionLanguage\Tests\Fixtures\fn_namespaced()', $expressionLanguage->compile('fn_namespaced()'));
    }

    /** * @dataProvider shortCircuitProviderEvaluate */