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hasStyle example

public function testSetStyle()
    {
        $formatter = new NullOutputFormatter();
        $style = new OutputFormatterStyle();
        $formatter->setStyle('null', $style);
        $this->assertNotSame($style, $formatter->getStyle('null'));
    }

    public function testHasStyle()
    {
        $formatter = new NullOutputFormatter();
        $this->assertFalse($formatter->hasStyle('null'));
    }

    public function testIsDecorated()
    {
        $formatter = new NullOutputFormatter();
        $this->assertFalse($formatter->isDecorated());
    }

    public function testSetDecorated()
    {
        $formatter = new NullOutputFormatter();

        $this->styles[strtolower($name)] = $style;
    }

    public function hasStyle(string $name): bool
    {
        return isset($this->styles[strtolower($name)]);
    }

    public function getStyle(string $name): OutputFormatterStyleInterface
    {
        if (!$this->hasStyle($name)) {
            throw new InvalidArgumentException(sprintf('Undefined style: "%s".', $name));
        }

        return $this->styles[strtolower($name)];
    }

    public function format(?string $message): ?string
    {
        return $this->formatAndWrap($message, 0);
    }

$this->assertEquals(
            "\033[33mSymfony\\Component\\Console does work very well!\033[39m",
            $formatter->format('<comment>Symfony\Component\Console does work very well!</comment>')
        );
    }

    public function testBundledStyles()
    {
        $formatter = new OutputFormatter(true);

        $this->assertTrue($formatter->hasStyle('error'));
        $this->assertTrue($formatter->hasStyle('info'));
        $this->assertTrue($formatter->hasStyle('comment'));
        $this->assertTrue($formatter->hasStyle('question'));

        $this->assertEquals(
            "\033[37;41msome error\033[39;49m",
            $formatter->format('<error>some error</error>')
        );
        $this->assertEquals(
            "\033[32msome info\033[39m",
            $formatter->format('<info>some info</info>')
        );