import 'reflect-metadata';

import {
    NumberPickerComponent,
} from './number-picker.component';

const initNumberPickerComponent = () => {
    return new NumberPickerComponent();
};

describe('canDecrease', () => {
    test('Returns true if value is greater than minValue', () => {
        const numberPickerComponent = initNumberPickerComponent();
        numberPickerComponent.value = 1;
        numberPickerComponent.minValue = 0;

        const result = numberPickerComponent.canDecrease();

        expect(result).toBe(true);
    });

    test('Returns false if value is equal to minValue', () => {
        const numberPickerComponent = initNumberPickerComponent();
        numberPickerComponent.value = 0;
        numberPickerComponent.minValue = 0;

        const result = numberPickerComponent.canDecrease();

        expect(result).toBe(false);
    });
});

describe('canIncrease', () => {
    test('Returns true if value is less than maxValue', () => {
        const numberPickerComponent = initNumberPickerComponent();
        numberPickerComponent.value = 0;
        numberPickerComponent.maxValue = 1;

        const result = numberPickerComponent.canIncrease();

        expect(result).toBe(true);
    });

    test('Returns false if value is equal to maxValue', () => {
        const numberPickerComponent = initNumberPickerComponent();
        numberPickerComponent.value = 0;
        numberPickerComponent.maxValue = 0;

        const result = numberPickerComponent.canIncrease();

        expect(result).toBe(false);
    });
});

describe('decreaseClicked', () => {
    test('Emits an even to onDecreaseClicked', () => {
        const numberPickerComponent = initNumberPickerComponent();
        numberPickerComponent.onDecreaseClicked.emit = jest.fn();

        numberPickerComponent.decreaseClicked();

        expect(numberPickerComponent.onDecreaseClicked.emit)
            .toHaveBeenCalled();
    });
});

describe('increaseClicked', () => {
    test('Emits an even to onIncreaseClicked', () => {
        const numberPickerComponent = initNumberPickerComponent();
        numberPickerComponent.onIncreaseClicked.emit = jest.fn();

        numberPickerComponent.increaseClicked();

        expect(numberPickerComponent.onIncreaseClicked.emit)
            .toHaveBeenCalled();
    });
});