Added more cases for testing native array access.

tests/unit/model/native-access/native-access-arrays-surrogate-method-test.js

@@ -0,0 +1,134 @@
+/**
+ * A test case to show that 'firstObject' doesn't return
+ * the current value of a ManagedArray with ember-source
+ * v4.10.0 due to its change of property notification.
+ */
+import { get } from '@ember/object';
+import { module, test } from 'qunit';
+import { setupTest } from 'ember-qunit';
+import DefaultSchema from 'ember-m3/services/m3-schema';
+
+function computeNestedModel(key, value /*, modelName, schemaInterface */) {
+  if (typeof value === 'object' && value !== null && !Array.isArray(value)) {
+    return {
+      attributes: value,
+    };
+  }
+}
+
+class TestSchema extends DefaultSchema {
+  includesModel(modelName) {
+    return /^com.example.bookstore\./i.test(modelName);
+  }
+  computeAttribute(key, value, modelName, schemaInterface) {
+    if (Array.isArray(value)) {
+      let nested = value.map((v) => {
+        if (typeof v === 'object') {
+          return schemaInterface.nested(computeNestedModel(key, v, modelName, schemaInterface));
+        } else {
+          return v;
+        }
+      });
+      return schemaInterface.managedArray(nested);
+    } else {
+      let nested = computeNestedModel(key, value, modelName, schemaInterface);
+      if (nested) {
+        return schemaInterface.nested(nested);
+      }
+    }
+  }
+}
+
+module(`unit/model/native-access/native-access-arrays/first-object`, function (hooks) {
+  setupTest(hooks);
+
+  hooks.beforeEach(function () {
+    this.owner.register('service:m3-schema', TestSchema);
+    this.store = this.owner.lookup('service:store');
+  });
+
+  test('Emptry Array: firstObject should work', function (assert) {
+    let model = this.store.push({
+      data: {
+        id: 'isbn:9780439708180',
+        type: 'com.example.bookstore.Book',
+        attributes: {
+          name: `Harry Potter and the Sorcerer's Stone`,
+          chapters: [],
+        },
+      },
+    });
+
+    let chapters = model.get('chapters');
+    get(chapters, 'firstObject.name'); // this READ would screw up the internal versioning state
+    chapters.pushObject({ name: 'The Boy Who Lived' });
+
+    assert.equal(get(chapters[0], 'name'), 'The Boy Who Lived', `[] reference works`);
+    // this assertion would fail with ember-source@4.10.0
+    assert.equal(get(chapters, 'firstObject.name'), 'The Boy Who Lived', `firstObject works`);
+  });
+
+  test('Emptry Array: lastObject should work', function (assert) {
+    let model = this.store.push({
+      data: {
+        id: 'isbn:9780439708180',
+        type: 'com.example.bookstore.Book',
+        attributes: {
+          name: `Harry Potter and the Sorcerer's Stone`,
+          chapters: [],
+        },
+      },
+    });
+
+    let chapters = model.get('chapters');
+    get(chapters, 'lastObject.name');
+    chapters.pushObject({ name: 'The Boy Who Lived' });
+
+    assert.equal(get(chapters[chapters.length -1], 'name'), 'The Boy Who Lived', `[] reference works`);
+    assert.equal(get(chapters, 'lastObject.name'), 'The Boy Who Lived', `lastObject works`);
+  });
+
+  test('Non-empty Array: firstObject should work', function (assert) {
+    let model = this.store.push({
+      data: {
+        id: 'isbn:9780439708180',
+        type: 'com.example.bookstore.Book',
+        attributes: {
+          name: `Harry Potter and the Sorcerer's Stone`,
+          chapters: [
+            { name: 'The Boy Who Lived' }
+          ],
+        },
+      },
+    });
+
+    let chapters = model.get('chapters');
+    get(chapters, 'firstObject.name'); // this READ would screw up the internal versioning state
+    chapters.pushObject({ name: 'Lives Forever!' });
+
+    assert.equal(get(chapters[0], 'name'), 'The Boy Who Lived', `[] reference works`);
+    // this assertion would fail with ember-source@4.10.0
+    assert.equal(get(chapters, 'firstObject.name'), 'The Boy Who Lived', `firstObject works`);
+  });
+
+  test('Non-empty Array: lastObject should work', function (assert) {
+    let model = this.store.push({
+      data: {
+        id: 'isbn:9780439708180',
+        type: 'com.example.bookstore.Book',
+        attributes: {
+          name: `Harry Potter and the Sorcerer's Stone`,
+          chapters: [],
+        },
+      },
+    });
+
+    let chapters = model.get('chapters');
+    get(chapters, 'lastObject.name');
+    chapters.pushObject({ name: 'Lives Forever!' });
+
+    assert.equal(get(chapters[chapters.length - 1], 'name'), 'Lives Forever!', `[] reference works`);
+    assert.equal(get(chapters, 'lastObject.name'), 'Lives Forever!', `lastObject works`);
+  });
+
+});