Fall back on givenName/familyName if no displayName/organization

ts/test/types/Contact_test.ts

@@ -0,0 +1,65 @@
+import 'mocha';
+import { assert } from 'chai';
+
+import { getName } from '../../types/Contact';
+
+describe('Contact', () => {
+  describe('getName', () => {
+    it('returns displayName if provided', () => {
+      const contact = {
+        name: {
+          displayName: 'displayName',
+          givenName: 'givenName',
+          familyName: 'familyName',
+        },
+        organization: 'Somewhere, Inc.',
+      };
+      const expected = 'displayName';
+      const actual = getName(contact);
+      assert.strictEqual(actual, expected);
+    });
+    it('returns organization if no displayName', () => {
+      const contact = {
+        name: {
+          givenName: 'givenName',
+          familyName: 'familyName',
+        },
+        organization: 'Somewhere, Inc.',
+      };
+      const expected = 'Somewhere, Inc.';
+      const actual = getName(contact);
+      assert.strictEqual(actual, expected);
+    });
+    it('returns givenName + familyName if no displayName or organization', () => {
+      const contact = {
+        name: {
+          givenName: 'givenName',
+          familyName: 'familyName',
+        },
+      };
+      const expected = 'givenName familyName';
+      const actual = getName(contact);
+      assert.strictEqual(actual, expected);
+    });
+    it('returns just givenName', () => {
+      const contact = {
+        name: {
+          givenName: 'givenName',
+        },
+      };
+      const expected = 'givenName';
+      const actual = getName(contact);
+      assert.strictEqual(actual, expected);
+    });
+    it('returns just familyName', () => {
+      const contact = {
+        name: {
+          familyName: 'familyName',
+        },
+      };
+      const expected = 'familyName';
+      const actual = getName(contact);
+      assert.strictEqual(actual, expected);
+    });
+  });
+});