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diff --git a/spec/javascripts/ide/components/commit_sidebar/message_field_spec.js b/spec/javascripts/ide/components/commit_sidebar/message_field_spec.js
new file mode 100644
index 00000000000..d62d58101d6
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+++ b/spec/javascripts/ide/components/commit_sidebar/message_field_spec.js
@@ -0,0 +1,174 @@
+import Vue from 'vue';
+import CommitMessageField from '~/ide/components/commit_sidebar/message_field.vue';
+import createComponent from 'spec/helpers/vue_mount_component_helper';
+
+describe('IDE commit message field', () => {
+  const Component = Vue.extend(CommitMessageField);
+  let vm;
+
+  beforeEach(() => {
+    setFixtures('<div id="app"></div>');
+
+    vm = createComponent(
+      Component,
+      {
+        text: '',
+      },
+      '#app',
+    );
+  });
+
+  afterEach(() => {
+    vm.$destroy();
+  });
+
+  it('adds is-focused class on focus', done => {
+    vm.$el.querySelector('textarea').focus();
+
+    vm.$nextTick(() => {
+      expect(vm.$el.querySelector('.is-focused')).not.toBeNull();
+
+      done();
+    });
+  });
+
+  it('removed is-focused class on blur', done => {
+    vm.$el.querySelector('textarea').focus();
+
+    vm
+      .$nextTick()
+      .then(() => {
+        expect(vm.$el.querySelector('.is-focused')).not.toBeNull();
+
+        vm.$el.querySelector('textarea').blur();
+
+        return vm.$nextTick();
+      })
+      .then(() => {
+        expect(vm.$el.querySelector('.is-focused')).toBeNull();
+
+        done();
+      })
+      .then(done)
+      .catch(done.fail);
+  });
+
+  it('emits input event on input', () => {
+    spyOn(vm, '$emit');
+
+    const textarea = vm.$el.querySelector('textarea');
+    textarea.value = 'testing';
+
+    textarea.dispatchEvent(new Event('input'));
+
+    expect(vm.$emit).toHaveBeenCalledWith('input', 'testing');
+  });
+
+  describe('highlights', () => {
+    describe('subject line', () => {
+      it('does not highlight less than 50 characters', done => {
+        vm.text = 'text less than 50 chars';
+
+        vm
+          .$nextTick()
+          .then(() => {
+            expect(vm.$el.querySelector('.highlights span').textContent).toContain(
+              'text less than 50 chars',
+            );
+            expect(vm.$el.querySelector('mark').style.display).toBe('none');
+          })
+          .then(done)
+          .catch(done.fail);
+      });
+
+      it('highlights characters over 50 length', done => {
+        vm.text =
+          'text less than 50 chars that should not highlighted. text more than 50 should be highlighted';
+
+        vm
+          .$nextTick()
+          .then(() => {
+            expect(vm.$el.querySelector('.highlights span').textContent).toContain(
+              'text less than 50 chars that should not highlighte',
+            );
+            expect(vm.$el.querySelector('mark').style.display).not.toBe('none');
+            expect(vm.$el.querySelector('mark').textContent).toBe(
+              'd. text more than 50 should be highlighted',
+            );
+          })
+          .then(done)
+          .catch(done.fail);
+      });
+    });
+
+    describe('body text', () => {
+      it('does not highlight body text less tan 72 characters', done => {
+        vm.text = 'subject line\nbody content';
+
+        vm
+          .$nextTick()
+          .then(() => {
+            expect(vm.$el.querySelectorAll('.highlights span').length).toBe(2);
+            expect(vm.$el.querySelectorAll('mark')[1].style.display).toBe('none');
+          })
+          .then(done)
+          .catch(done.fail);
+      });
+
+      it('highlights body text more than 72 characters', done => {
+        vm.text =
+          'subject line\nbody content that will be highlighted when it is more than 72 characters in length';
+
+        vm
+          .$nextTick()
+          .then(() => {
+            expect(vm.$el.querySelectorAll('.highlights span').length).toBe(2);
+            expect(vm.$el.querySelectorAll('mark')[1].style.display).not.toBe('none');
+            expect(vm.$el.querySelectorAll('mark')[1].textContent).toBe(' in length');
+          })
+          .then(done)
+          .catch(done.fail);
+      });
+
+      it('highlights body text & subject line', done => {
+        vm.text =
+          'text less than 50 chars that should not highlighted\nbody content that will be highlighted when it is more than 72 characters in length';
+
+        vm
+          .$nextTick()
+          .then(() => {
+            expect(vm.$el.querySelectorAll('.highlights span').length).toBe(2);
+            expect(vm.$el.querySelectorAll('mark').length).toBe(2);
+
+            expect(vm.$el.querySelectorAll('mark')[0].textContent).toContain('d');
+            expect(vm.$el.querySelectorAll('mark')[1].textContent).toBe(' in length');
+          })
+          .then(done)
+          .catch(done.fail);
+      });
+    });
+  });
+
+  describe('scrolling textarea', () => {
+    it('updates transform of highlights', done => {
+      vm.text = 'subject line\n\n\n\n\n\n\n\n\n\n\nbody content';
+
+      vm
+        .$nextTick()
+        .then(() => {
+          vm.$el.querySelector('textarea').scrollTo(0, 50);
+
+          vm.handleScroll();
+        })
+        .then(vm.$nextTick)
+        .then(() => {
+          expect(vm.scrollTop).toBe(50);
+          expect(vm.$el.querySelector('.highlights').style.transform).toBe(
+            'translate3d(0px, -50px, 0px)',
+          );
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+  });
+});