added mail adapter tests

Author: mtrezza

spec/ApiMailAdapter.spec.js

@@ -123,7 +123,7 @@ describe('ApiMailAdapter', () => {
       }
     });
 
-    it('fails with invalid placeholder callback configuration', async () => {
+    it('fails with invalid placeholder callback', async () => {
       const configs = [
         { apiCallback: df, sender: ds, templates: { customEmail: { subjectPath: ds, textPath: ds, placeholderCallback: {} } } },
         { apiCallback: df, sender: ds, templates: { customEmail: { subjectPath: ds, textPath: ds, placeholderCallback: ds } } }
@@ -133,6 +133,29 @@ describe('ApiMailAdapter', () => {
       }
     });
 
+    it('fails with missing or invalid API callback', async () => {
+      const configs = [
+        { sender: ds, templates: { customEmail: { subjectPath: ds, textPath: ds } } },
+        { apiCallback: null, sender: ds, templates: { customEmail: { subjectPath: ds, textPath: ds } } },
+        { apiCallback: true, sender: ds, templates: { customEmail: { subjectPath: ds, textPath: ds } } },
+        { apiCallback: ds, sender: ds, templates: { customEmail: { subjectPath: ds, textPath: ds } } },
+      ];
+      for (const config of configs) {
+        expect(adapter(config)).toThrow(Errors.Error.apiCallbackNoFunction);
+      }
+    });
+
+    it('fails with invalid locale callback', async () => {
+      const configs = [
+        { apiCallback: df, sender: ds, templates: { customEmail: { subjectPath: ds, textPath: ds, localeCallback: ds } } },
+        { apiCallback: df, sender: ds, templates: { customEmail: { subjectPath: ds, textPath: ds, localeCallback: true } } },
+        { apiCallback: df, sender: ds, templates: { customEmail: { subjectPath: ds, textPath: ds, localeCallback: [] } } },
+      ];
+      for (const config of configs) {
+        expect(adapter(config)).toThrow(Errors.Error.localeCallbackNoFunction);
+      }
+    });
+
     it('succeeds with valid configuration', async () => {
       const configs = [
         { apiCallback: df, sender: ds, templates: { customEmail: { subjectPath: ds, textPath: ds } } },