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node_modules/zen-observable/test/observer-closed.js

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+import assert from 'assert';
+import { testMethodProperty } from './properties.js';
+
+describe('observer.closed', () => {
+  it('is a getter on SubscriptionObserver.prototype', () => {
+    let observer;
+    new Observable(x => { observer = x }).subscribe();
+    testMethodProperty(Object.getPrototypeOf(observer), 'closed', {
+      get: true,
+      configurable: true,
+      writable: true,
+      length: 1
+    });
+  });
+
+  it('returns false when the subscription is open', () => {
+    new Observable(observer => {
+      assert.equal(observer.closed, false);
+    }).subscribe();
+  });
+
+  it('returns true when the subscription is completed', () => {
+    let observer;
+    new Observable(x => { observer = x; }).subscribe();
+    observer.complete();
+    assert.equal(observer.closed, true);
+  });
+
+  it('returns true when the subscription is errored', () => {
+    let observer;
+    new Observable(x => { observer = x; }).subscribe(null, () => {});
+    observer.error();
+    assert.equal(observer.closed, true);
+  });
+});