1 files changed, 78 insertions, 0 deletions
diff --git a/spec/frontend/feature_flags/components/strategies/percent_rollout_spec.js b/spec/frontend/feature_flags/components/strategies/percent_rollout_spec.js
new file mode 100644
index 00000000000..de0b439f1c5
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+++ b/spec/frontend/feature_flags/components/strategies/percent_rollout_spec.js
@@ -0,0 +1,78 @@
+import { mount } from '@vue/test-utils';
+import { GlFormInput } from '@gitlab/ui';
+import PercentRollout from '~/feature_flags/components/strategies/percent_rollout.vue';
+import ParameterFormGroup from '~/feature_flags/components/strategies/parameter_form_group.vue';
+import { PERCENT_ROLLOUT_GROUP_ID } from '~/feature_flags/constants';
+import { percentRolloutStrategy } from '../../mock_data';
+
+const DEFAULT_PROPS = {
+  strategy: percentRolloutStrategy,
+};
+
+describe('~/feature_flags/components/strategies/percent_rollout.vue', () => {
+  let wrapper;
+  let input;
+  let formGroup;
+
+  const factory = (props = {}) =>
+    mount(PercentRollout, { propsData: { ...DEFAULT_PROPS, ...props } });
+
+  afterEach(() => {
+    if (wrapper?.destroy) {
+      wrapper.destroy();
+    }
+
+    wrapper = null;
+  });
+
+  describe('with valid percentage', () => {
+    beforeEach(() => {
+      wrapper = factory();
+
+      input = wrapper.find(GlFormInput);
+      formGroup = wrapper.find(ParameterFormGroup);
+    });
+
+    it('displays the current value', () => {
+      expect(input.element.value).toBe(percentRolloutStrategy.parameters.percentage);
+    });
+
+    it('emits a change when the value changes', async () => {
+      input.setValue('75');
+      await wrapper.vm.$nextTick();
+      expect(wrapper.emitted('change')).toEqual([
+        [{ parameters: { percentage: '75', groupId: PERCENT_ROLLOUT_GROUP_ID } }],
+      ]);
+    });
+
+    it('does not show errors', () => {
+      expect(formGroup.attributes('state')).toBe('true');
+    });
+  });
+
+  describe('with percentage that is out of range', () => {
+    beforeEach(() => {
+      wrapper = factory({ strategy: { parameters: { percentage: '101' } } });
+
+      input = wrapper.find(GlFormInput);
+      formGroup = wrapper.find(ParameterFormGroup);
+    });
+
+    it('shows errors', () => {
+      expect(formGroup.attributes('state')).toBeUndefined();
+    });
+  });
+
+  describe('with percentage that is not a whole number', () => {
+    beforeEach(() => {
+      wrapper = factory({ strategy: { parameters: { percentage: '3.14' } } });
+
+      input = wrapper.find(GlFormInput);
+      formGroup = wrapper.find(ParameterFormGroup);
+    });
+
+    it('shows errors', () => {
+      expect(formGroup.attributes('state')).toBeUndefined();
+    });
+  });
+});