public function test_wp_get_icon_returns_svg_for_known_icon() {

$output = wp_get_icon( 'core/plus' );

$this->assertStringStartsWith( '<svg ', $output );

$this->assertStringContainsString( '</svg>', $output );

}

public function test_wp_get_icon_returns_empty_string_for_unknown_icon() {

$output = wp_get_icon( 'this-icon-does-not-exist' );

$this->assertSame( '', $output );

}

public function test_wp_get_icon_default_attributes() {

$output = wp_get_icon( 'core/plus' );

// WP 7.0+ lowercases `viewBox` to `viewbox` via the HTML API in

// `wp_kses()`; older versions keep the original casing.

$this->assertStringContainsStringIgnoringCase( 'viewbox="0 0 24 24"', $output );

$this->assertStringContainsString( 'width="24"', $output );

$this->assertStringContainsString( 'height="24"', $output );

$this->assertStringContainsString( 'aria-hidden="true"', $output );

$this->assertStringContainsString( 'focusable="false"', $output );

}

public function test_wp_get_icon_custom_size() {

$output = wp_get_icon( 'core/plus', array( 'size' => 32 ) );

$this->assertStringContainsString( 'width="32"', $output );

$this->assertStringContainsString( 'height="32"', $output );

}

public function test_wp_get_icon_size_null_leaves_dimensions_untouched() {

$output = wp_get_icon( 'core/plus', array( 'size' => null ) );

$processor = new WP_HTML_Tag_Processor( $output );

$this->assertTrue( $processor->next_tag( 'svg' ) );

$this->assertNull( $processor->get_attribute( 'width' ) );

$this->assertNull( $processor->get_attribute( 'height' ) );

}

public function test_wp_get_icon_size_zero_outputs_zero_dimensions() {

$output = wp_get_icon( 'core/plus', array( 'size' => 0 ) );

$this->assertStringContainsString( 'width="0"', $output );

$this->assertStringContainsString( 'height="0"', $output );

}

public function test_wp_get_icon_custom_class() {

$output = wp_get_icon( 'core/plus', array( 'class' => 'my-button-icon' ) );

$this->assertStringContainsString( 'class="my-button-icon"', $output );

}

public function test_wp_get_icon_multiple_classes() {

$output = wp_get_icon( 'core/plus', array( 'class' => 'foo bar baz' ) );

$this->assertStringContainsString( 'class="foo bar baz"', $output );

}

public function test_wp_get_icon_with_label() {

$output = wp_get_icon( 'core/plus', array( 'label' => 'Add item' ) );

$this->assertStringContainsString( 'role="img"', $output );

$this->assertStringContainsString( 'aria-label="Add item"', $output );

$this->assertStringNotContainsString( 'aria-hidden', $output );

$this->assertStringNotContainsString( 'focusable', $output );

}

public function test_wp_get_icon_without_label_is_hidden() {

$output = wp_get_icon( 'core/plus' );

$this->assertStringContainsString( 'aria-hidden="true"', $output );

$this->assertStringContainsString( 'focusable="false"', $output );

$this->assertStringNotContainsString( 'role="img"', $output );

$this->assertStringNotContainsString( 'aria-label', $output );

}

public function test_wp_get_icon_contains_svg_content() {

$output = wp_get_icon( 'core/plus' );

$this->assertStringContainsString( '<path ', $output );

}

public function test_wp_get_icon_escapes_attributes() {

$output = wp_get_icon( 'core/plus', array( 'class' => '"><script>alert(1)</script>' ) );

$this->assertStringNotContainsString( '<script>', $output );

}

public function test_core_collection_is_public() {

$collection = WP_Icon_Collections_Registry::get_instance()->get_registered( 'core' );

$this->assertIsArray( $collection, 'The core collection should be registered.' );

$this->assertTrue( $collection['public'], 'The core collection should be public.' );

}

public function test_core_admin_collection_is_not_public() {

$collection = WP_Icon_Collections_Registry::get_instance()->get_registered( 'core-admin' );

$this->assertIsArray( $collection, 'The core-admin collection should be registered.' );

$this->assertFalse(

$collection['public'],

'The core-admin collection should not be public, so that the admin icons stay out of the REST API.'

);

}