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node_modules/zen-observable/test/subscription.js

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+import assert from 'assert';
+import { testMethodProperty } from './properties.js';
+
+describe('subscription', () => {
+
+  function getSubscription(subscriber = () => {}) {
+    return new Observable(subscriber).subscribe();
+  }
+
+  describe('unsubscribe', () => {
+    it('is a method on Subscription.prototype', () => {
+      let subscription = getSubscription();
+      testMethodProperty(Object.getPrototypeOf(subscription), 'unsubscribe', {
+        configurable: true,
+        writable: true,
+        length: 0,
+      });
+    });
+
+    it('reports an error if the cleanup function throws', () => {
+      let error = {};
+      let subscription = getSubscription(() => {
+        return () => { throw error };
+      });
+      subscription.unsubscribe();
+      assert.equal(hostError, error);
+    });
+  });
+
+  describe('closed', () => {
+    it('is a getter on Subscription.prototype', () => {
+      let subscription = getSubscription();
+      testMethodProperty(Object.getPrototypeOf(subscription), 'closed', {
+        configurable: true,
+        writable: true,
+        get: true,
+      });
+    });
+  });
+
+});