Manual initializer tests (#858)

Unit tests for the manual initializer

J=SLAP-1371
TEST=auto

tests/static/js/manual-initializer.js

@@ -0,0 +1,32 @@
+import ManualInitializer from '../../../static/js/manual-initializer';
+
+describe('The manual initializer works', () => {
+  let initAnswers;
+
+  beforeEach(() => {
+    window.AnswersExperience = {
+      runtimeConfig: {
+        get: jest.fn(),
+        set: jest.fn()
+      }
+    };
+    initAnswers = jest.fn();
+    const manualInitializer = new ManualInitializer(initAnswers);
+    manualInitializer.setup();
+  })
+
+  it('The manual init function calls initAnswers', () => {
+    window.AnswersExperience.init();
+    expect(initAnswers).toHaveBeenCalledTimes(1);
+  });
+
+  it('Data passed into the init function is set on the runtimeConfig', () => {
+    window.AnswersExperience.init({ 
+      token: '123abc',
+      linkTarget: '_blank'
+    });
+    const runtimeConfigSet = window.AnswersExperience.runtimeConfig.set;
+    expect(runtimeConfigSet).toHaveBeenCalledWith('token', '123abc');
+    expect(runtimeConfigSet).toHaveBeenCalledWith('linkTarget', '_blank');
+  });
+});