Add Message.withInheritedSchemaVersion

test/modules/types/message_test.js

@@ -0,0 +1,63 @@
+const { assert } = require('chai');
+
+const Message = require('../../../js/modules/types/message');
+
+
+describe('Message', () => {
+  describe('withInheritedSchemaVersion', () => {
+    it('should ignore messages with previously inherited schema', () => {
+      const input = {
+        body: 'Imagine there is no heaven…',
+        schemaVersion: 2,
+      };
+      const expected = {
+        body: 'Imagine there is no heaven…',
+        schemaVersion: 2,
+      };
+
+      const actual = Message.withInheritedSchemaVersion(input);
+      assert.deepEqual(actual, expected);
+    });
+
+    context('for message without attachments', () => {
+      it('should initialize schema version to zero', () => {
+        const input = {
+          body: 'Imagine there is no heaven…',
+          attachments: [],
+        };
+        const expected = {
+          body: 'Imagine there is no heaven…',
+          attachments: [],
+          schemaVersion: 0,
+        };
+
+        const actual = Message.withInheritedSchemaVersion(input);
+        assert.deepEqual(actual, expected);
+      });
+    });
+
+    context('for message with attachments', () => {
+      it('should inherit existing attachment schema version', () => {
+        const input = {
+          body: 'Imagine there is no heaven…',
+          attachments: [{
+            contentType: 'image/jpeg',
+            fileName: 'lennon.jpg',
+            schemaVersion: 7,
+          }],
+        };
+        const expected = {
+          body: 'Imagine there is no heaven…',
+          attachments: [{
+            contentType: 'image/jpeg',
+            fileName: 'lennon.jpg',
+          }],
+          schemaVersion: 7,
+        };
+
+        const actual = Message.withInheritedSchemaVersion(input);
+        assert.deepEqual(actual, expected);
+      });
+    });
+  });
+});