Resolve "Override squash commit message"

app/assets/javascripts/vue_merge_request_widget/components/states/commit_edit.vue

+<script>
+export default {
+  props: {
+    value: {
+      type: String,
+      required: true,
+    },
+    label: {
+      type: String,
+      required: true,
+    },
+    inputId: {
+      type: String,
+      required: true,
+    },
+  },
+};
+</script>
+
+<template>
+  <li>
+    <div class="commit-message-editor">
+      <div class="d-flex flex-wrap align-items-center justify-content-between">
+        <label class="col-form-label" :for="inputId">
+          <strong>{{ label }}</strong>
+        </label>
+        <slot name="header"></slot>
+      </div>
+      <textarea
+        :id="inputId"
+        :value="value"
+        class="form-control js-gfm-input append-bottom-default commit-message-edit"
+        required="required"
+        rows="7"
+        @input="$emit('input', $event.target.value)"
+      ></textarea>
+      <slot name="checkbox"></slot>
+    </div>
+  </li>
+</template>

app/assets/javascripts/vue_merge_request_widget/components/states/commit_message_dropdown.vue

+<script>
+import { GlDropdown, GlDropdownItem } from '@gitlab/ui';
+
+export default {
+  components: {
+    GlDropdown,
+    GlDropdownItem,
+  },
+  props: {
+    commits: {
+      type: Array,
+      required: true,
+      default: () => [],
+    },
+  },
+};
+</script>
+
+<template>
+  <div>
+    <gl-dropdown
+      right
+      no-caret
+      text="Use an existing commit message"
+      variant="link"
+      class="mr-commit-dropdown"
+    >
+      <gl-dropdown-item
+        v-for="commit in commits"
+        :key="commit.short_id"
+        class="text-nowrap text-truncate"
+        @click="$emit('input', commit.message)"
+      >
+        <span class="monospace mr-2">{{ commit.short_id }}</span> {{ commit.title }}
+      </gl-dropdown-item>
+    </gl-dropdown>
+  </div>
+</template>

app/assets/javascripts/vue_merge_request_widget/components/states/commits_header.vue

+<script>
+import { GlButton } from '@gitlab/ui';
+import _ from 'underscore';
+import { __, n__, sprintf, s__ } from '~/locale';
+import Icon from '~/vue_shared/components/icon.vue';
+
+export default {
+  components: {
+    Icon,
+    GlButton,
+  },
+  props: {
+    isSquashEnabled: {
+      type: Boolean,
+      required: true,
+    },
+    commitsCount: {
+      type: Number,
+      required: false,
+      default: 0,
+    },
+    targetBranch: {
+      type: String,
+      required: true,
+    },
+  },
+  data() {
+    return {
+      expanded: false,
+    };
+  },
+  computed: {
+    collapseIcon() {
+      return this.expanded ? 'chevron-down' : 'chevron-right';
+    },
+    commitsCountMessage() {
+      return n__(__('%d commit'), __('%d commits'), this.isSquashEnabled ? 1 : this.commitsCount);
+    },
+    modifyLinkMessage() {
+      return this.isSquashEnabled ? __('Modify commit messages') : __('Modify merge commit');
+    },
+    ariaLabel() {
+      return this.expanded ? __('Collapse') : __('Expand');
+    },
+    message() {
+      return sprintf(
+        s__(
+          'mrWidgetCommitsAdded|%{commitCount} and %{mergeCommitCount} will be added to %{targetBranch}.',
+        ),
+        {
+          commitCount: `<strong class="commits-count-message">${this.commitsCountMessage}</strong>`,
+          mergeCommitCount: `<strong>${s__('mrWidgetCommitsAdded|1 merge commit')}</strong>`,
+          targetBranch: `<span class="label-branch">${_.escape(this.targetBranch)}</span>`,
+        },
+        false,
+      );
+    },
+  },
+  methods: {
+    toggle() {
+      this.expanded = !this.expanded;
+    },
+  },
+};
+</script>
+
+<template>
+  <div>
+    <div
+      class="js-mr-widget-commits-count mr-widget-extension clickable d-flex align-items-center px-3 py-2"
+      @click="toggle()"
+    >
+      <gl-button
+        :aria-label="ariaLabel"
+        variant="blank"
+        class="commit-edit-toggle mr-2"
+        @click.stop="toggle()"
+      >
+        <icon :name="collapseIcon" :size="16" />
+      </gl-button>
+      <span v-if="expanded">{{ __('Collapse') }}</span>
+      <span v-else>
+        <span v-html="message"></span>
+        <gl-button variant="link" class="modify-message-button">
+          {{ modifyLinkMessage }}
+        </gl-button>
+      </span>
+    </div>
+    <div v-show="expanded"><slot></slot></div>
+  </div>
+</template>

app/assets/javascripts/vue_merge_request_widget/mr_widget_options.vue

@@ -315,7 +315,7 @@ export default {
         :endpoint="mr.testResultsPath"
       />
 
-      <div class="mr-widget-section">
+      <div class="mr-widget-section p-0">
         <component :is="componentName" :mr="mr" :service="service" />
 
         <section v-if="shouldRenderCollaborationStatus" class="mr-info-list mr-links">

app/assets/javascripts/vue_merge_request_widget/stores/mr_widget_store.js

@@ -42,6 +42,8 @@ export default class MergeRequestStore {
     this.mergePipeline = data.merge_pipeline || {};
     this.deployments = this.deployments || data.deployments || [];
     this.postMergeDeployments = this.postMergeDeployments || [];
+    this.commits = data.commits_without_merge_commits || [];
+    this.squashCommitMessage = data.default_squash_commit_message;
     this.initRebase(data);
 
     if (data.issues_links) {

app/assets/stylesheets/framework/common.scss

@@ -391,6 +391,11 @@ img.emoji {
 .flex-no-shrink { flex-shrink: 0; }
 .ws-initial { white-space: initial; }
 .overflow-auto { overflow: auto; }
+.d-flex-center {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
 
 /** COMMON SIZING CLASSES **/
 .w-0 { width: 0; }
@@ -402,6 +407,10 @@ img.emoji {
 
 .min-height-0 { min-height: 0; }
 
+.w-3 { width: #{3 * $grid-size}; }
+
+.h-3 { width: #{3 * $grid-size}; }
+
 /** COMMON SPACING CLASSES **/
 .gl-pl-0 { padding-left: 0; }
 .gl-pl-1 { padding-left: #{0.5 * $grid-size}; }

app/assets/stylesheets/framework/variables.scss

@@ -243,6 +243,7 @@ $gl-padding-8: 8px;
 $gl-padding: 16px;
 $gl-padding-24: 24px;
 $gl-padding-32: 32px;
+$gl-padding-50: 50px;
 $gl-col-padding: 15px;
 $gl-input-padding: 10px;
 $gl-vert-padding: 6px;

app/assets/stylesheets/pages/merge_requests.scss

@@ -38,9 +38,7 @@
 }
 
 .mr-widget-section {
-  .media {
-    align-items: center;
-  }
+  border-radius: $border-radius-default $border-radius-default 0 0;
 
   .code-text {
     flex: 1;
@@ -56,6 +54,11 @@
 .mr-widget-extension {
   border-top: 1px solid $border-color;
   background-color: $gray-light;
+
+  &.clickable:hover {
+    background-color: $gl-gray-200;
+    cursor: pointer;
+  }
 }
 
 .mr-widget-workflow {
@@ -78,6 +81,7 @@
   border-top: 0;
 }
 
+.mr-widget-body,
 .mr-widget-section,
 .mr-widget-content,
 .mr-widget-footer {
@@ -87,11 +91,38 @@
 .mr-state-widget {
   color: $gl-text-color;
 
+  .commit-message-edit {
+    border-radius: $border-radius-default;
+  }
+
   .mr-widget-section,
   .mr-widget-footer {
     border-top: solid 1px $border-color;
   }
 
+  .mr-fast-forward-message {
+    padding-left: $gl-padding-50;
+    padding-bottom: $gl-padding;
+  }
+
+  .commits-list {
+    > li {
+      padding: $gl-padding;
+
+      @include media-breakpoint-up(md) {
+        padding-left: $gl-padding-50;
+      }
+    }
+  }
+
+  .mr-commit-dropdown {
+    .dropdown-menu {
+      @include media-breakpoint-up(md) {
+        width: 150%;
+      }
+    }
+  }
+
   .mr-widget-footer {
     padding: 0;
   }
@@ -405,7 +436,7 @@
   }
 
   .mr-widget-help {
-    padding: 10px 16px 10px 48px;
+    padding: 10px 16px 10px $gl-padding-50;
     font-style: italic;
   }
 
@@ -423,10 +454,6 @@
   }
 }
 
-.mr-widget-body-controls {
-  flex-wrap: wrap;
-}
-
 .mr_source_commit,
 .mr_target_commit {
   margin-bottom: 0;

changelogs/unreleased/56014-better-squash-commit-messages.yml

----
-title: Default squash commit message is now selected from the longest commit when
-  squashing merge requests
-merge_request: 24518
-author:
-type: changed

doc/user/project/merge_requests/squash_and_merge.md

@@ -23,11 +23,14 @@ The squashed commit's commit message will be either:
 - Taken from the first multi-line commit message in the merge.
 - The merge request's title if no multi-line commit message is found.
 
-Note that the squashed commit is still followed by a merge commit,
-as the merge method for this example repository uses a merge commit.
-Squashing also works with the fast-forward merge strategy, see
-[squashing and fast-forward merge](#squash-and-fast-forward-merge) for more
-details.
+It can be customized before merging a merge request.
+
+![A squash commit message editor](img/squash_mr_message.png)
+
+NOTE: **Note:**
+The squashed commit in this example is followed by a merge commit, as the merge method for this example repository uses a merge commit.
+
+Squashing also works with the fast-forward merge strategy, see [squashing and fast-forward merge](#squash-and-fast-forward-merge) for more details.
 
 ## Use cases
 
@@ -60,7 +63,7 @@ This can then be overridden at the time of accepting the merge request:
 
 The squashed commit has the following metadata:
 
-- Message: the message of the squash commit.
+- Message: the message of the squash commit, or a customized message.
 - Author: the author of the merge request.
 - Committer: the user who initiated the squash.
 

locale/gitlab.pot

@@ -32,6 +32,9 @@ msgid_plural "%d commits behind"
 msgstr[0] ""
 msgstr[1] ""
 
+msgid "%d commits"
+msgstr ""
+
 msgid "%d exporter"
 msgid_plural "%d exporters"
 msgstr[0] ""
@@ -2531,6 +2534,9 @@ msgstr ""
 msgid "Delete list"
 msgstr ""
 
+msgid "Delete source branch"
+msgstr ""
+
 msgid "Delete this attachment"
 msgstr ""
 
@@ -3256,6 +3262,9 @@ msgstr ""
 msgid "Failure"
 msgstr ""
 
+msgid "Fast-forward merge without a merge commit"
+msgstr ""
+
 msgid "Faster as it re-uses the project workspace (falling back to clone if it doesn't exist)"
 msgstr ""
 
@@ -3905,6 +3914,9 @@ msgstr ""
 msgid "Include a Terms of Service agreement and Privacy Policy that all users must accept."
 msgstr ""
 
+msgid "Include merge request description"
+msgstr ""
+
 msgid "Include the username in the URL if required: <code>https://username@gitlab.company.com/group/project.git</code>."
 msgstr ""
 
@@ -4437,9 +4449,18 @@ msgstr ""
 msgid "Merge Requests"
 msgstr ""
 
+msgid "Merge commit message"
+msgstr ""
+
 msgid "Merge events"
 msgstr ""
 
+msgid "Merge immediately"
+msgstr ""
+
+msgid "Merge in progress"
+msgstr ""
+
 msgid "Merge request"
 msgstr ""
 
@@ -4449,6 +4470,9 @@ msgstr ""
 msgid "Merge requests are a place to propose changes you've made to a project and discuss those changes with others"
 msgstr ""
 
+msgid "Merge when pipeline succeeds"
+msgstr ""
+
 msgid "MergeRequests|Add a reply"
 msgstr ""
 
@@ -4605,6 +4629,12 @@ msgstr ""
 msgid "Modal|Close"
 msgstr ""
 
+msgid "Modify commit messages"
+msgstr ""
+
+msgid "Modify merge commit"
+msgstr ""
+
 msgid "Monitor your errors by integrating with Sentry"
 msgstr ""
 
@@ -6622,6 +6652,9 @@ msgstr ""
 msgid "Something went wrong while closing the %{issuable}. Please try again later"
 msgstr ""
 
+msgid "Something went wrong while deleting the source branch. Please try again."
+msgstr ""
+
 msgid "Something went wrong while fetching comments. Please try again."
 msgstr ""
 
@@ -6634,6 +6667,9 @@ msgstr ""
 msgid "Something went wrong while fetching the registry list."
 msgstr ""
 
+msgid "Something went wrong while merging this merge request. Please try again."
+msgstr ""
+
 msgid "Something went wrong while reopening the %{issuable}. Please try again later"
 msgstr ""
 
@@ -6778,6 +6814,9 @@ msgstr ""
 msgid "Specify the following URL during the Runner setup:"
 msgstr ""
 
+msgid "Squash commit message"
+msgstr ""
+
 msgid "Squash commits"
 msgstr ""
 
@@ -8294,6 +8333,9 @@ msgstr ""
 msgid "You can only edit files when you are on a branch"
 msgstr ""
 
+msgid "You can only merge once the items above are resolved"
+msgstr ""
+
 msgid "You can resolve the merge conflict using either the Interactive mode, by choosing %{use_ours} or %{use_theirs} buttons, or by editing the files directly. Commit these changes into %{branch_name}"
 msgstr ""
 
@@ -8588,6 +8630,12 @@ msgstr[1] ""
 msgid "missing"
 msgstr ""
 
+msgid "mrWidgetCommitsAdded|%{commitCount} and %{mergeCommitCount} will be added to %{targetBranch}."
+msgstr ""
+
+msgid "mrWidgetCommitsAdded|1 merge commit"
+msgstr ""
+
 msgid "mrWidget| Please restore it or use a different %{missingBranchName} branch"
 msgstr ""
 

spec/features/merge_request/user_accepts_merge_request_spec.rb

@@ -80,8 +80,8 @@ describe 'User accepts a merge request', :js do
     end
 
     it 'accepts a merge request' do
-      click_button('Modify commit message')
-      fill_in('Commit message', with: 'wow such merge')
+      find('.js-mr-widget-commits-count').click
+      fill_in('merge-message-edit', with: 'wow such merge')
 
       click_button('Merge')
 

spec/features/merge_request/user_customizes_merge_commit_message_spec.rb

@@ -13,7 +13,7 @@ describe 'Merge request < User customizes merge commit message', :js do
       description: "Description\n\nclosing #{issue_1.to_reference}, #{issue_2.to_reference}"
     )
   end
-  let(:textbox) { page.find(:css, '.js-commit-message', visible: false) }
+  let(:textbox) { page.find(:css, '#merge-message-edit', visible: false) }
   let(:default_message) do
     [
       "Merge branch 'feature' into 'master'",
@@ -38,16 +38,16 @@ describe 'Merge request < User customizes merge commit message', :js do
   end
 
   it 'toggles commit message between message with description and without description' do
-    expect(page).not_to have_selector('.js-commit-message')
-    click_button "Modify commit message"
+    expect(page).not_to have_selector('#merge-message-edit')
+    first('.js-mr-widget-commits-count').click
     expect(textbox).to be_visible
     expect(textbox.value).to eq(default_message)
 
-    click_link "Include description in commit message"
+    check('Include merge request description')
 
     expect(textbox.value).to eq(message_with_description)
 
-    click_link "Don't include description in commit message"
+    uncheck('Include merge request description')
 
     expect(textbox.value).to eq(default_message)
   end

spec/javascripts/vue_mr_widget/components/states/commit_edit_spec.js

+import { createLocalVue, shallowMount } from '@vue/test-utils';
+import CommitEdit from '~/vue_merge_request_widget/components/states/commit_edit.vue';
+
+const localVue = createLocalVue();
+const testCommitMessage = 'Test commit message';
+const testLabel = 'Test label';
+const testInputId = 'test-input-id';
+
+describe('Commits edit component', () => {
+  let wrapper;
+
+  const createComponent = (slots = {}) => {
+    wrapper = shallowMount(localVue.extend(CommitEdit), {
+      localVue,
+      sync: false,
+      propsData: {
+        value: testCommitMessage,
+        label: testLabel,
+        inputId: testInputId,
+      },
+      slots: {
+        ...slots,
+      },
+    });
+  };
+
+  beforeEach(() => {
+    createComponent();
+  });
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  const findTextarea = () => wrapper.find('.form-control');
+
+  it('has a correct label', () => {
+    const labelElement = wrapper.find('.col-form-label');
+
+    expect(labelElement.text()).toBe(testLabel);
+  });
+
+  describe('textarea', () => {
+    it('has a correct ID', () => {
+      expect(findTextarea().attributes('id')).toBe(testInputId);
+    });
+
+    it('has a correct value', () => {
+      expect(findTextarea().element.value).toBe(testCommitMessage);
+    });
+
+    it('emits an input event and receives changed value', () => {
+      const changedCommitMessage = 'Changed commit message';
+
+      findTextarea().element.value = changedCommitMessage;
+      findTextarea().trigger('input');
+
+      expect(wrapper.emitted().input[0]).toEqual([changedCommitMessage]);
+      expect(findTextarea().element.value).toBe(changedCommitMessage);
+    });
+  });
+
+  describe('when slots are present', () => {
+    beforeEach(() => {
+      createComponent({
+        header: `<div class="test-header">${testCommitMessage}</div>`,
+        checkbox: `<label slot="checkbox" class="test-checkbox">${testLabel}</label >`,
+      });
+    });
+
+    it('renders header slot correctly', () => {
+      const headerSlotElement = wrapper.find('.test-header');
+
+      expect(headerSlotElement.exists()).toBe(true);
+      expect(headerSlotElement.text()).toBe(testCommitMessage);
+    });
+
+    it('renders checkbox slot correctly', () => {
+      const checkboxSlotElement = wrapper.find('.test-checkbox');
+
+      expect(checkboxSlotElement.exists()).toBe(true);
+      expect(checkboxSlotElement.text()).toBe(testLabel);
+    });
+  });
+});

spec/javascripts/vue_mr_widget/components/states/mr_widget_commit_message_dropdown_spec.js

+import { createLocalVue, shallowMount } from '@vue/test-utils';
+import { GlDropdownItem } from '@gitlab/ui';
+import CommitMessageDropdown from '~/vue_merge_request_widget/components/states/commit_message_dropdown.vue';
+
+const localVue = createLocalVue();
+const commits = [
+  {
+    title: 'Commit 1',
+    short_id: '78d5b7',
+    message: 'Update test.txt',
+  },
+  {
+    title: 'Commit 2',
+    short_id: '34cbe28b',
+    message: 'Fixed test',
+  },
+  {
+    title: 'Commit 3',
+    short_id: 'fa42932a',
+    message: 'Added changelog',
+  },
+];
+
+describe('Commits message dropdown component', () => {
+  let wrapper;
+
+  const createComponent = () => {
+    wrapper = shallowMount(localVue.extend(CommitMessageDropdown), {
+      localVue,
+      sync: false,
+      propsData: {
+        commits,
+      },
+    });
+  };
+
+  beforeEach(() => {
+    createComponent();
+  });
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  const findDropdownElements = () => wrapper.findAll(GlDropdownItem);
+  const findFirstDropdownElement = () => findDropdownElements().at(0);
+
+  it('should have 3 elements in dropdown list', () => {
+    expect(findDropdownElements().length).toBe(3);
+  });
+
+  it('should have correct message for the first dropdown list element', () => {
+    expect(findFirstDropdownElement().text()).toBe('78d5b7 Commit 1');
+  });
+
+  it('should emit a commit title on selecting commit', () => {
+    findFirstDropdownElement().vm.$emit('click');
+
+    expect(wrapper.emitted().input[0]).toEqual(['Update test.txt']);
+  });
+});

spec/javascripts/vue_mr_widget/components/states/mr_widget_commits_header_spec.js

+import { createLocalVue, shallowMount } from '@vue/test-utils';
+import CommitsHeader from '~/vue_merge_request_widget/components/states/commits_header.vue';
+import Icon from '~/vue_shared/components/icon.vue';
+
+const localVue = createLocalVue();
+
+describe('Commits header component', () => {
+  let wrapper;
+
+  const createComponent = props => {
+    wrapper = shallowMount(localVue.extend(CommitsHeader), {
+      localVue,
+      sync: false,
+      propsData: {
+        isSquashEnabled: false,
+        targetBranch: 'master',
+        commitsCount: 5,
+        ...props,
+      },
+    });
+  };
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  const findHeaderWrapper = () => wrapper.find('.js-mr-widget-commits-count');
+  const findCommitToggle = () => wrapper.find('.commit-edit-toggle');
+  const findIcon = () => wrapper.find(Icon);
+  const findCommitsCountMessage = () => wrapper.find('.commits-count-message');
+  const findTargetBranchMessage = () => wrapper.find('.label-branch');
+  const findModifyButton = () => wrapper.find('.modify-message-button');
+
+  describe('when collapsed', () => {
+    it('toggle has aria-label equal to Expand', () => {
+      createComponent();
+
+      expect(findCommitToggle().attributes('aria-label')).toBe('Expand');
+    });
+
+    it('has a chevron-right icon', () => {
+      createComponent();
+      wrapper.setData({ expanded: false });
+
+      expect(findIcon().props('name')).toBe('chevron-right');
+    });
+
+    describe('when squash is disabled', () => {
+      beforeEach(() => {
+        createComponent();
+      });
+
+      it('has commits count message showing correct amount of commits', () => {
+        expect(findCommitsCountMessage().text()).toBe('5 commits');
+      });
+
+      it('has button with modify merge commit message', () => {
+        expect(findModifyButton().text()).toBe('Modify merge commit');
+      });
+    });
+
+    describe('when squash is enabled', () => {
+      beforeEach(() => {
+        createComponent({ isSquashEnabled: true });
+      });
+
+      it('has commits count message showing one commit when squash is enabled', () => {
+        expect(findCommitsCountMessage().text()).toBe('1 commit');
+      });
+
+      it('has button with modify commit messages text', () => {
+        expect(findModifyButton().text()).toBe('Modify commit messages');
+      });
+    });
+
+    it('has correct target branch displayed', () => {
+      createComponent();
+
+      expect(findTargetBranchMessage().text()).toBe('master');
+    });
+  });
+
+  describe('when expanded', () => {
+    beforeEach(() => {
+      createComponent();
+      wrapper.setData({ expanded: true });
+    });
+
+    it('toggle has aria-label equal to collapse', done => {
+      wrapper.vm.$nextTick(() => {
+        expect(findCommitToggle().attributes('aria-label')).toBe('Collapse');
+        done();
+      });
+    });
+
+    it('has a chevron-down icon', done => {
+      wrapper.vm.$nextTick(() => {
+        expect(findIcon().props('name')).toBe('chevron-down');
+        done();
+      });
+    });
+
+    it('has a collapse text', done => {
+      wrapper.vm.$nextTick(() => {
+        expect(findHeaderWrapper().text()).toBe('Collapse');
+        done();
+      });
+    });
+  });
+});

spec/javascripts/vue_mr_widget/components/states/mr_widget_ready_to_merge_spec.js

 import Vue from 'vue';
 import ReadyToMerge from '~/vue_merge_request_widget/components/states/ready_to_merge.vue';
 import SquashBeforeMerge from '~/vue_merge_request_widget/components/states/squash_before_merge.vue';
+import CommitsHeader from '~/vue_merge_request_widget/components/states/commits_header.vue';
+import CommitEdit from '~/vue_merge_request_widget/components/states/commit_edit.vue';
+import CommitMessageDropdown from '~/vue_merge_request_widget/components/states/commit_message_dropdown.vue';
 import eventHub from '~/vue_merge_request_widget/event_hub';
 import { createLocalVue, shallowMount } from '@vue/test-utils';
 
 const commitMessage = 'This is the commit message';
+const squashCommitMessage = 'This is the squash commit message';
 const commitMessageWithDescription = 'This is the commit message description';
 const createTestMr = customConfig => {
   const mr = {
@@ -19,9 +23,11 @@ const createTestMr = customConfig => {
     sha: '12345678',
     squash: false,
     commitMessage,
+    squashCommitMessage,
     commitMessageWithDescription,
     shouldRemoveSourceBranch: true,
     canRemoveSourceBranch: false,
+    targetBranch: 'master',
   };
 
   Object.assign(mr, customConfig.mr);
@@ -98,21 +104,6 @@ describe('ReadyToMerge', () => {
       });
     });
 
-    describe('commitMessageLinkTitle', () => {
-      const withDesc = 'Include description in commit message';
-      const withoutDesc = "Don't include description in commit message";
-
-      it('should return message with description', () => {
-        expect(vm.commitMessageLinkTitle).toEqual(withDesc);
-      });
-
-      it('should return message without description', () => {
-        vm.useCommitMessageWithDescription = true;
-
-        expect(vm.commitMessageLinkTitle).toEqual(withoutDesc);
-      });
-    });
-
     describe('status', () => {
       it('defaults to success', () => {
         vm.mr.pipeline = true;
@@ -279,55 +270,43 @@ describe('ReadyToMerge', () => {
         vm.mr.isMergeAllowed = false;
         vm.mr.isPipelineActive = false;
 
-        expect(vm.shouldShowMergeControls()).toBeFalsy();
+        expect(vm.shouldShowMergeControls).toBeFalsy();
       });
 
       it('should return true when the build succeeded or build not required to succeed', () => {
         vm.mr.isMergeAllowed = true;
         vm.mr.isPipelineActive = false;
 
-        expect(vm.shouldShowMergeControls()).toBeTruthy();
+        expect(vm.shouldShowMergeControls).toBeTruthy();
       });
 
       it('should return true when showing the MWPS button and a pipeline is running that needs to be successful', () => {
         vm.mr.isMergeAllowed = false;
         vm.mr.isPipelineActive = true;
 
-        expect(vm.shouldShowMergeControls()).toBeTruthy();
+        expect(vm.shouldShowMergeControls).toBeTruthy();
       });
 
       it('should return true when showing the MWPS button but not required for the pipeline to succeed', () => {
         vm.mr.isMergeAllowed = true;
         vm.mr.isPipelineActive = true;
 
-        expect(vm.shouldShowMergeControls()).toBeTruthy();
+        expect(vm.shouldShowMergeControls).toBeTruthy();
       });
     });
 
-    describe('updateCommitMessage', () => {
+    describe('updateMergeCommitMessage', () => {
       it('should revert flag and change commitMessage', () => {
-        expect(vm.useCommitMessageWithDescription).toBeFalsy();
         expect(vm.commitMessage).toEqual(commitMessage);
-        vm.updateCommitMessage();
+        vm.updateMergeCommitMessage(true);
 
-        expect(vm.useCommitMessageWithDescription).toBeTruthy();
         expect(vm.commitMessage).toEqual(commitMessageWithDescription);
-        vm.updateCommitMessage();
+        vm.updateMergeCommitMessage(false);
 
-        expect(vm.useCommitMessageWithDescription).toBeFalsy();
         expect(vm.commitMessage).toEqual(commitMessage);
       });
     });
 
-    describe('toggleCommitMessageEditor', () => {
-      it('should toggle showCommitMessageEditor flag', () => {
-        expect(vm.showCommitMessageEditor).toBeFalsy();
-        vm.toggleCommitMessageEditor();
-
-        expect(vm.showCommitMessageEditor).toBeTruthy();
-      });
-    });
-
     describe('handleMergeButtonClick', () => {
       const returnPromise = status =>
         new Promise(resolve => {
@@ -623,7 +602,7 @@ describe('ReadyToMerge', () => {
     });
   });
 
-  describe('Squash checkbox component', () => {
+  describe('render children components', () => {
     let wrapper;
     const localVue = createLocalVue();
 
@@ -642,7 +621,11 @@ describe('ReadyToMerge', () => {
     });
 
     const findCheckboxElement = () => wrapper.find(SquashBeforeMerge);
+    const findCommitsHeaderElement = () => wrapper.find(CommitsHeader);
+    const findCommitEditElements = () => wrapper.findAll(CommitEdit);
+    const findCommitDropdownElement = () => wrapper.find(CommitMessageDropdown);
 
+    describe('squash checkbox', () => {
       it('should be rendered when squash before merge is enabled and there is more than 1 commit', () => {
         createLocalComponent({
           mr: { commitsCount: 2, enableSquashBeforeMerge: true },
@@ -664,6 +647,78 @@ describe('ReadyToMerge', () => {
       });
     });
 
+    describe('commits count collapsible header', () => {
+      it('should be rendered if fast-forward is disabled', () => {
+        createLocalComponent();
+
+        expect(findCommitsHeaderElement().exists()).toBeTruthy();
+      });
+
+      it('should not be rendered if fast-forward is enabled', () => {
+        createLocalComponent({ mr: { ffOnlyEnabled: true } });
+
+        expect(findCommitsHeaderElement().exists()).toBeFalsy();
+      });
+    });
+
+    describe('commits edit components', () => {
+      it('should have one edit component when squash is disabled', () => {
+        createLocalComponent();
+
+        expect(findCommitEditElements().length).toBe(1);
+      });
+
+      const findFirstCommitEditLabel = () =>
+        findCommitEditElements()
+          .at(0)
+          .props('label');
+
+      it('should have two edit components when squash is enabled', () => {
+        createLocalComponent({
+          mr: {
+            commitsCount: 2,
+            squash: true,
+            enableSquashBeforeMerge: true,
+          },
+        });
+
+        expect(findCommitEditElements().length).toBe(2);
+      });
+
+      it('should have correct edit merge commit label', () => {
+        createLocalComponent();
+
+        expect(findFirstCommitEditLabel()).toBe('Merge commit message');
+      });
+
+      it('should have correct edit squash commit label', () => {
+        createLocalComponent({
+          mr: {
+            commitsCount: 2,
+            squash: true,
+            enableSquashBeforeMerge: true,
+          },
+        });
+
+        expect(findFirstCommitEditLabel()).toBe('Squash commit message');
+      });
+    });
+
+    describe('commits dropdown', () => {
+      it('should not be rendered if squash is disabled', () => {
+        createLocalComponent();
+
+        expect(findCommitDropdownElement().exists()).toBeFalsy();
+      });
+
+      it('should  be rendered if squash is enabled', () => {
+        createLocalComponent({ mr: { squash: true } });
+
+        expect(findCommitDropdownElement().exists()).toBeTruthy();
+      });
+    });
+  });
+
   describe('Merge controls', () => {
     describe('when allowed to merge', () => {
       beforeEach(() => {
@@ -696,10 +751,6 @@ describe('ReadyToMerge', () => {
         expect(vm.$el.querySelector('.js-remove-source-branch-checkbox')).toBeNull();
       });
 
-      it('does not show  modify commit message button', () => {
-        expect(vm.$el.querySelector('.js-modify-commit-message-button')).toBeNull();
-      });
-
       it('shows message to resolve all items before being allowed to merge', () => {
         expect(vm.$el.querySelector('.js-resolve-mr-widget-items-message')).toBeDefined();
       });
@@ -712,7 +763,7 @@ describe('ReadyToMerge', () => {
         mr: { ffOnlyEnabled: false },
       });
 
-      expect(customVm.$el.querySelector('.js-fast-forward-message')).toBeNull();
+      expect(customVm.$el.querySelector('.mr-fast-forward-message')).toBeNull();
       expect(customVm.$el.querySelector('.js-modify-commit-message-button')).toBeDefined();
     });
 
@@ -721,7 +772,7 @@ describe('ReadyToMerge', () => {
         mr: { ffOnlyEnabled: true },
       });
 
-      expect(customVm.$el.querySelector('.js-fast-forward-message')).toBeDefined();
+      expect(customVm.$el.querySelector('.mr-fast-forward-message')).toBeDefined();
       expect(customVm.$el.querySelector('.js-modify-commit-message-button')).toBeNull();
     });
   });

spec/javascripts/vue_mr_widget/mock_data.js

@@ -215,12 +215,14 @@ export default {
   project_archived: false,
   default_merge_commit_message_with_description:
     "Merge branch 'daaaa' into 'master'\n\nUpdate README.md\n\nSee merge request !22",
+  default_squash_commit_message: 'Test squash commit message',
   diverged_commits_count: 0,
   only_allow_merge_if_pipeline_succeeds: false,
   commit_change_content_path: '/root/acets-app/merge_requests/22/commit_change_content',
   merge_commit_path:
     'http://localhost:3000/root/acets-app/commit/53027d060246c8f47e4a9310fb332aa52f221775',
   troubleshooting_docs_path: 'help',
+  squash: true,
 };
 
 export const mockStore = {