Add unit tests for mutations

* Mock out moutations but test they are called at the right time

ee/spec/frontend/security_configuration/corpus_management/components/__snapshots__/corpus_upload_form_spec.js.snap

@@ -28,7 +28,9 @@ exports[`Corpus upload modal corpus modal uploading state does show the upload p
     <span
       class="gl-button-text"
     >
+      
       Cancel
+    
     </span>
   </button>
 </div>

ee/spec/frontend/security_configuration/corpus_management/components/corpus_upload_spec.js

-import { GlButton } from '@gitlab/ui';
+import { GlButton, GlModal } from '@gitlab/ui';
 import { shallowMount } from '@vue/test-utils';
 import CorpusUpload from 'ee/security_configuration/corpus_management/components/corpus_upload.vue';
+import CorpusUploadForm from 'ee/security_configuration/corpus_management/components/corpus_upload_form.vue';
 
 const TEST_PROJECT_FULL_PATH = '/namespace/project';
 
 describe('Corpus Upload', () => {
   let wrapper;
 
+  const findModal = () => wrapper.findComponent(GlModal);
+  const findCorpusUploadForm = () => wrapper.findComponent(CorpusUploadForm);
+
   const createComponentFactory = (mountFn = shallowMount) => (options = {}) => {
     const defaultProps = { totalSize: 4e8 };
     wrapper = mountFn(CorpusUpload, {
@@ -37,5 +41,43 @@ describe('Corpus Upload', () => {
       expect(wrapper.findComponent(GlButton).exists()).toBe(true);
       expect(wrapper.element).toMatchSnapshot();
     });
+
+    describe('addCorpus mutation', () => {
+      it('called when the add button is clicked from the modal', async () => {
+        createComponent();
+        jest.spyOn(wrapper.vm, 'addCorpus').mockImplementation(() => {});
+        await wrapper.vm.$forceUpdate();
+        findModal().vm.$emit('primary');
+        expect(wrapper.vm.addCorpus).toHaveBeenCalled();
+      });
+    });
+
+    describe('resetCorpus mutation', () => {
+      it('called when the cancel button is clicked from the modal', async () => {
+        createComponent();
+        jest.spyOn(wrapper.vm, 'resetCorpus').mockImplementation(() => {});
+        await wrapper.vm.$forceUpdate();
+        findModal().vm.$emit('canceled');
+        expect(wrapper.vm.resetCorpus).toHaveBeenCalled();
+      });
+
+      it('called when the upload form triggers a reset', async () => {
+        createComponent();
+        jest.spyOn(wrapper.vm, 'resetCorpus').mockImplementation(() => {});
+        await wrapper.vm.$forceUpdate();
+        findCorpusUploadForm().vm.$emit('resetCorpus');
+        expect(wrapper.vm.resetCorpus).toHaveBeenCalled();
+      });
+    });
+
+    describe('uploadCorpus mutation', () => {
+      it('called when the upload file is clicked from the modal', async () => {
+        createComponent();
+        jest.spyOn(wrapper.vm, 'beginFileUpload').mockImplementation(() => {});
+        await wrapper.vm.$forceUpdate();
+        findCorpusUploadForm().vm.$emit('beginFileUpload');
+        expect(wrapper.vm.beginFileUpload).toHaveBeenCalled();
+      });
+    });
   });
 });