@angular/material/fesm2022/form-field/testing/control.mjs

Angular Material

import { ComponentHarness } from '@angular/cdk/testing';

/**
 * Base class for custom form-field control harnesses. Harnesses for
 * custom controls with form-fields need to implement this interface.
 */
class MatFormFieldControlHarness extends ComponentHarness {
}
/**
 * Shared behavior for `MatFormFieldControlHarness` implementations
 */
class MatFormFieldControlHarnessBase extends MatFormFieldControlHarness {
    /**
     * Gets the label for the control, if it exists. This might be provided by a label element or by
     * the `aria-label` attribute.
     */
    async getLabel() {
        const documentRootLocator = this.documentRootLocatorFactory();
        const labelId = await (await this.host()).getAttribute('aria-labelledby');
        const labelText = await (await this.host()).getAttribute('aria-label');
        const hostId = await (await this.host()).getAttribute('id');
        if (labelId) {
            // First, try to find the label by following [aria-labelledby]
            const labelEl = await documentRootLocator.locatorForOptional(`[id="${labelId}"]`)();
            return labelEl ? labelEl.text() : null;
        }
        else if (labelText) {
            // If that doesn't work, return [aria-label] if it exists
            return labelText;
        }
        else if (hostId) {
            // Finally, search the DOM for a label that points to the host element
            const labelEl = await documentRootLocator.locatorForOptional(`[for="${hostId}"]`)();
            return labelEl ? labelEl.text() : null;
        }
        return null;
    }
}

export { MatFormFieldControlHarness, MatFormFieldControlHarnessBase };
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