Icons: Enforce strict name validation in register method

[im3dabasia]

Trac ticket: https://core.trac.wordpress.org/ticket/64847

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Commit this PR after the wp/7.0 release branch has been created. This PR targets the 7.1 release.

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[t-hamano]

Thanks for the PR! I think there are roughly two areas for improvement.

public function test() {
	$result = $this->register( 'invalid-name', array() );
	$this->assertFalse( $result );
}

This test appears correct at first glance, but note that the second argument is an empty array. If the second argument is empty, it will cause an error here. In other words, this test does not guarantee whether the error is caused by an invalid icon name.

Another suggestion is to use a data provider, which reduces the amount of code and allows us to cover more cases. For example:

public function test_invalid_icon_names( $icon_name ) {
	$settings = array(
		'label'   => 'Icon',
		'content' => '<svg></svg>',
	);

	$result = $this->register( $icon_name, $settings );
	$this->assertFalse( $result );
}

public function data_invalid_icon_names() {
	return array(
		'non-string name'      => array( 1 ),
		'no namespace'         => array( 'plus' ),
		'uppercase characters' => array( 'Core/Plus' ),
		'invalid characters'   => array( 'test/_doing_it_wrong' ),
	);
}

[im3dabasia]

Thanks for the continuous iterations on this PR. I have addressed the feedbacks in this commit bf30902

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[t-hamano]

LGTM!

Additionally, it would be great if you made the same changes to WordPress/gutenberg#76079.