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node_modules/zen-observable/test/properties.js

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+import assert from 'assert';
+
+export function testMethodProperty(object, key, options) {
+  let desc = Object.getOwnPropertyDescriptor(object, key);
+  let { enumerable = false, configurable = false, writable = false, length } = options;
+
+  assert.ok(desc, `Property ${ key.toString() } exists`);
+
+  if (options.get || options.set) {
+    if (options.get) {
+      assert.equal(typeof desc.get, 'function', 'Getter is a function');
+      assert.equal(desc.get.length, 0, 'Getter length is 0');
+    } else {
+      assert.equal(desc.get, undefined, 'Getter is undefined');
+    }
+
+    if (options.set) {
+      assert.equal(typeof desc.set, 'function', 'Setter is a function');
+      assert.equal(desc.set.length, 1, 'Setter length is 1');
+    } else {
+      assert.equal(desc.set, undefined, 'Setter is undefined');
+    }
+  } else {
+    assert.equal(typeof desc.value, 'function', 'Value is a function');
+    assert.equal(desc.value.length, length, `Function length is ${ length }`);
+    assert.equal(desc.writable, writable, `Writable property is correct ${ writable }`);
+  }
+
+  assert.equal(desc.enumerable, enumerable, `Enumerable property is ${ enumerable }`);
+  assert.equal(desc.configurable, configurable, `Configurable property is ${ configurable }`);
+}