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diff --git a/spec/frontend/search/topbar/components/searchable_dropdown_spec.js b/spec/frontend/search/topbar/components/searchable_dropdown_spec.js
new file mode 100644
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+++ b/spec/frontend/search/topbar/components/searchable_dropdown_spec.js
@@ -0,0 +1,167 @@
+import Vuex from 'vuex';
+import { createLocalVue, shallowMount, mount } from '@vue/test-utils';
+import { GlDropdown, GlDropdownItem, GlSearchBoxByType, GlSkeletonLoader } from '@gitlab/ui';
+import { MOCK_GROUPS, MOCK_GROUP, MOCK_QUERY } from 'jest/search/mock_data';
+import SearchableDropdown from '~/search/topbar/components/searchable_dropdown.vue';
+import { ANY_OPTION, GROUP_DATA } from '~/search/topbar/constants';
+
+const localVue = createLocalVue();
+localVue.use(Vuex);
+
+describe('Global Search Searchable Dropdown', () => {
+  let wrapper;
+
+  const defaultProps = {
+    headerText: GROUP_DATA.headerText,
+    selectedDisplayValue: GROUP_DATA.selectedDisplayValue,
+    itemsDisplayValue: GROUP_DATA.itemsDisplayValue,
+    loading: false,
+    selectedItem: ANY_OPTION,
+    items: [],
+  };
+
+  const createComponent = (initialState, props, mountFn = shallowMount) => {
+    const store = new Vuex.Store({
+      state: {
+        query: MOCK_QUERY,
+        ...initialState,
+      },
+    });
+
+    wrapper = mountFn(SearchableDropdown, {
+      localVue,
+      store,
+      propsData: {
+        ...defaultProps,
+        ...props,
+      },
+    });
+  };
+
+  afterEach(() => {
+    wrapper.destroy();
+    wrapper = null;
+  });
+
+  const findGlDropdown = () => wrapper.find(GlDropdown);
+  const findGlDropdownSearch = () => findGlDropdown().find(GlSearchBoxByType);
+  const findDropdownText = () => findGlDropdown().find('.dropdown-toggle-text');
+  const findDropdownItems = () => findGlDropdown().findAll(GlDropdownItem);
+  const findDropdownItemsText = () => findDropdownItems().wrappers.map(w => w.text());
+  const findAnyDropdownItem = () => findDropdownItems().at(0);
+  const findFirstGroupDropdownItem = () => findDropdownItems().at(1);
+  const findLoader = () => wrapper.find(GlSkeletonLoader);
+
+  describe('template', () => {
+    beforeEach(() => {
+      createComponent();
+    });
+
+    it('renders GlDropdown', () => {
+      expect(findGlDropdown().exists()).toBe(true);
+    });
+
+    describe('findGlDropdownSearch', () => {
+      it('renders always', () => {
+        expect(findGlDropdownSearch().exists()).toBe(true);
+      });
+
+      it('has debounce prop', () => {
+        expect(findGlDropdownSearch().attributes('debounce')).toBe('500');
+      });
+
+      describe('onSearch', () => {
+        const search = 'test search';
+
+        beforeEach(() => {
+          findGlDropdownSearch().vm.$emit('input', search);
+        });
+
+        it('$emits @search when input event is fired from GlSearchBoxByType', () => {
+          expect(wrapper.emitted('search')[0]).toEqual([search]);
+        });
+      });
+    });
+
+    describe('findDropdownItems', () => {
+      describe('when loading is false', () => {
+        beforeEach(() => {
+          createComponent({}, { items: MOCK_GROUPS });
+        });
+
+        it('does not render loader', () => {
+          expect(findLoader().exists()).toBe(false);
+        });
+
+        it('renders an instance for each namespace', () => {
+          const resultsIncludeAny = ['Any'].concat(MOCK_GROUPS.map(n => n.full_name));
+          expect(findDropdownItemsText()).toStrictEqual(resultsIncludeAny);
+        });
+      });
+
+      describe('when loading is true', () => {
+        beforeEach(() => {
+          createComponent({}, { loading: true, items: MOCK_GROUPS });
+        });
+
+        it('does render loader', () => {
+          expect(findLoader().exists()).toBe(true);
+        });
+
+        it('renders only Any in dropdown', () => {
+          expect(findDropdownItemsText()).toStrictEqual(['Any']);
+        });
+      });
+
+      describe('when item is selected', () => {
+        beforeEach(() => {
+          createComponent({}, { items: MOCK_GROUPS, selectedItem: MOCK_GROUPS[0] });
+        });
+
+        it('marks the dropdown as checked', () => {
+          expect(findFirstGroupDropdownItem().attributes('ischecked')).toBe('true');
+        });
+      });
+    });
+
+    describe('Dropdown Text', () => {
+      describe('when selectedItem is any', () => {
+        beforeEach(() => {
+          createComponent({}, {}, mount);
+        });
+
+        it('sets dropdown text to Any', () => {
+          expect(findDropdownText().text()).toBe(ANY_OPTION.name);
+        });
+      });
+
+      describe('selectedItem is set', () => {
+        beforeEach(() => {
+          createComponent({}, { selectedItem: MOCK_GROUP }, mount);
+        });
+
+        it('sets dropdown text to the selectedItem selectedDisplayValue', () => {
+          expect(findDropdownText().text()).toBe(MOCK_GROUP[GROUP_DATA.selectedDisplayValue]);
+        });
+      });
+    });
+  });
+
+  describe('actions', () => {
+    beforeEach(() => {
+      createComponent({}, { items: MOCK_GROUPS });
+    });
+
+    it('clicking "Any" dropdown item $emits @change with ANY_OPTION', () => {
+      findAnyDropdownItem().vm.$emit('click');
+
+      expect(wrapper.emitted('change')[0]).toEqual([ANY_OPTION]);
+    });
+
+    it('clicking result dropdown item $emits @change with result', () => {
+      findFirstGroupDropdownItem().vm.$emit('click');
+
+      expect(wrapper.emitted('change')[0]).toEqual([MOCK_GROUPS[0]]);
+    });
+  });
+});