1 | import DeviceSensor from '../DeviceSensor';
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2 | import MockNativeSensorModule from './mocks/MockNativeSensorModule';
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3 |
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4 | it(`counts the number of listeners`, () => {
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5 | const nativeModule = new MockNativeSensorModule();
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6 | const sensor = new DeviceSensor(nativeModule, 'mockDidUpdate');
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7 |
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8 |
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9 | const subscription1 = sensor.addListener(() => {});
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10 | expect(sensor.hasListeners()).toBe(true);
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11 | expect(sensor.getListenerCount()).toBe(1);
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12 |
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13 | const subscription2 = sensor.addListener(() => {});
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14 | sensor.addListener(() => {});
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15 | expect(sensor.getListenerCount()).toBe(3);
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16 |
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17 |
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18 | subscription2.remove();
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19 | expect(sensor.getListenerCount()).toBe(2);
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20 |
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21 | sensor.removeSubscription(subscription1);
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22 | expect(sensor.getListenerCount()).toBe(1);
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23 |
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24 | sensor.removeAllListeners();
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25 | expect(sensor.getListenerCount()).toBe(0);
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26 | });
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