alsatian-test/alsatian

import { PropertySpy } from "../spying";
import { Matcher } from "./matcher";
import { stringify } from "../stringification";

/**
 * Checks whether properties have performed as expected
 */
export class PropertyMatcher<PropertyType> extends Matcher<
    PropertySpy<PropertyType>
> {
    /**
     * Checks that a property spy has been set
     */
    public toHaveBeenSet() {
        this.registerMatcher(
            (this.actualValue.setCalls.length === 0) !== this.shouldMatch,
            `Expected property ${!this.shouldMatch ? "not " : ""}to be set`,
            `property ${this.shouldMatch ? "" : "not "}to have been set`
        );
    }

    /**
     * Checks that a property spy has been set to a specific value
     * @param value - a value to which the property should be set to
     */
    public toHaveBeenSetTo(value: PropertyType) {
        const stringifiedValue = stringify(value);

        this.registerMatcher(
            this.actualValue.setCalls.some(
                call => call.args[0] === value
            ) === this.shouldMatch,
            `Expected property ${!this.shouldMatch ? "not " : ""}to be set to ${stringifiedValue}.`,
            `property ${this.shouldMatch ? "" : "not "}to be set to ${stringifiedValue}.`,
            {
                actualValues: this.actualValue.setCalls.map(call => call.args[0]),
                expectedValue: value
            }
        );
    }
}