1 files changed, 203 insertions, 0 deletions
diff --git a/spec/frontend/diffs/components/diff_row_utils_spec.js b/spec/frontend/diffs/components/diff_row_utils_spec.js
new file mode 100644
index 00000000000..394b6cb1914
--- /dev/null
+++ b/spec/frontend/diffs/components/diff_row_utils_spec.js
@@ -0,0 +1,203 @@
+import * as utils from '~/diffs/components/diff_row_utils';
+import {
+  MATCH_LINE_TYPE,
+  CONTEXT_LINE_TYPE,
+  OLD_NO_NEW_LINE_TYPE,
+  NEW_NO_NEW_LINE_TYPE,
+  EMPTY_CELL_TYPE,
+} from '~/diffs/constants';
+
+const LINE_CODE = 'abc123';
+
+describe('isHighlighted', () => {
+  it('should return true if line is highlighted', () => {
+    const state = { diffs: { highlightedRow: LINE_CODE } };
+    const line = { line_code: LINE_CODE };
+    const isCommented = false;
+    expect(utils.isHighlighted(state, line, isCommented)).toBe(true);
+  });
+
+  it('should return false if line is not highlighted', () => {
+    const state = { diffs: { highlightedRow: 'xxx' } };
+    const line = { line_code: LINE_CODE };
+    const isCommented = false;
+    expect(utils.isHighlighted(state, line, isCommented)).toBe(false);
+  });
+
+  it('should return true if isCommented is true', () => {
+    const state = { diffs: { highlightedRow: 'xxx' } };
+    const line = { line_code: LINE_CODE };
+    const isCommented = true;
+    expect(utils.isHighlighted(state, line, isCommented)).toBe(true);
+  });
+});
+
+describe('isContextLine', () => {
+  it('return true if line type is context', () => {
+    expect(utils.isContextLine(CONTEXT_LINE_TYPE)).toBe(true);
+  });
+
+  it('return false if line type is not context', () => {
+    expect(utils.isContextLine('xxx')).toBe(false);
+  });
+});
+
+describe('isMatchLine', () => {
+  it('return true if line type is match', () => {
+    expect(utils.isMatchLine(MATCH_LINE_TYPE)).toBe(true);
+  });
+
+  it('return false if line type is not match', () => {
+    expect(utils.isMatchLine('xxx')).toBe(false);
+  });
+});
+
+describe('isMetaLine', () => {
+  it.each`
+    type                    | expectation
+    ${OLD_NO_NEW_LINE_TYPE} | ${true}
+    ${NEW_NO_NEW_LINE_TYPE} | ${true}
+    ${EMPTY_CELL_TYPE}      | ${true}
+    ${'xxx'}                | ${false}
+  `('should return $expectation if type is $type', ({ type, expectation }) => {
+    expect(utils.isMetaLine(type)).toBe(expectation);
+  });
+});
+
+describe('shouldRenderCommentButton', () => {
+  it('should return false if comment button is not rendered', () => {
+    expect(utils.shouldRenderCommentButton(true, false)).toBe(false);
+  });
+
+  it('should return false if not logged in', () => {
+    expect(utils.shouldRenderCommentButton(false, true)).toBe(false);
+  });
+
+  it('should return true logged in and rendered', () => {
+    expect(utils.shouldRenderCommentButton(true, true)).toBe(true);
+  });
+});
+
+describe('hasDiscussions', () => {
+  it('should return false if line is undefined', () => {
+    expect(utils.hasDiscussions()).toBe(false);
+  });
+
+  it('should return false if discussions is undefined', () => {
+    expect(utils.hasDiscussions({})).toBe(false);
+  });
+
+  it('should return false if discussions has legnth of 0', () => {
+    expect(utils.hasDiscussions({ discussions: [] })).toBe(false);
+  });
+
+  it('should return true if discussions has legnth > 0', () => {
+    expect(utils.hasDiscussions({ discussions: [1] })).toBe(true);
+  });
+});
+
+describe('lineHref', () => {
+  it(`should return #${LINE_CODE}`, () => {
+    expect(utils.lineHref({ line_code: LINE_CODE })).toEqual(`#${LINE_CODE}`);
+  });
+
+  it(`should return '#' if line is undefined`, () => {
+    expect(utils.lineHref()).toEqual('#');
+  });
+
+  it(`should return '#' if line_code is undefined`, () => {
+    expect(utils.lineHref({})).toEqual('#');
+  });
+});
+
+describe('lineCode', () => {
+  it(`should return undefined if line_code is undefined`, () => {
+    expect(utils.lineCode()).toEqual(undefined);
+    expect(utils.lineCode({ left: {} })).toEqual(undefined);
+    expect(utils.lineCode({ right: {} })).toEqual(undefined);
+  });
+
+  it(`should return ${LINE_CODE}`, () => {
+    expect(utils.lineCode({ line_code: LINE_CODE })).toEqual(LINE_CODE);
+    expect(utils.lineCode({ left: { line_code: LINE_CODE } })).toEqual(LINE_CODE);
+    expect(utils.lineCode({ right: { line_code: LINE_CODE } })).toEqual(LINE_CODE);
+  });
+});
+
+describe('classNameMapCell', () => {
+  it.each`
+    line               | hll      | loggedIn | hovered  | expectation
+    ${undefined}       | ${true}  | ${true}  | ${true}  | ${[]}
+    ${{ type: 'new' }} | ${false} | ${false} | ${false} | ${['new', { hll: false, 'is-over': false }]}
+    ${{ type: 'new' }} | ${true}  | ${true}  | ${false} | ${['new', { hll: true, 'is-over': false }]}
+    ${{ type: 'new' }} | ${true}  | ${false} | ${true}  | ${['new', { hll: true, 'is-over': false }]}
+    ${{ type: 'new' }} | ${true}  | ${true}  | ${true}  | ${['new', { hll: true, 'is-over': true }]}
+  `('should return $expectation', ({ line, hll, loggedIn, hovered, expectation }) => {
+    const classes = utils.classNameMapCell(line, hll, loggedIn, hovered);
+    expect(classes).toEqual(expectation);
+  });
+});
+
+describe('addCommentTooltip', () => {
+  const brokenSymLinkTooltip =
+    'Commenting on symbolic links that replace or are replaced by files is currently not supported.';
+  const brokenRealTooltip =
+    'Commenting on files that replace or are replaced by symbolic links is currently not supported.';
+  it('should return default tooltip', () => {
+    expect(utils.addCommentTooltip()).toBeUndefined();
+  });
+
+  it('should return broken symlink tooltip', () => {
+    expect(utils.addCommentTooltip({ commentsDisabled: { wasSymbolic: true } })).toEqual(
+      brokenSymLinkTooltip,
+    );
+    expect(utils.addCommentTooltip({ commentsDisabled: { isSymbolic: true } })).toEqual(
+      brokenSymLinkTooltip,
+    );
+  });
+
+  it('should return broken real tooltip', () => {
+    expect(utils.addCommentTooltip({ commentsDisabled: { wasReal: true } })).toEqual(
+      brokenRealTooltip,
+    );
+    expect(utils.addCommentTooltip({ commentsDisabled: { isReal: true } })).toEqual(
+      brokenRealTooltip,
+    );
+  });
+});
+
+describe('parallelViewLeftLineType', () => {
+  it(`should return ${OLD_NO_NEW_LINE_TYPE}`, () => {
+    expect(utils.parallelViewLeftLineType({ right: { type: NEW_NO_NEW_LINE_TYPE } })).toEqual(
+      OLD_NO_NEW_LINE_TYPE,
+    );
+  });
+
+  it(`should return 'new'`, () => {
+    expect(utils.parallelViewLeftLineType({ left: { type: 'new' } })).toContain('new');
+  });
+
+  it(`should return ${EMPTY_CELL_TYPE}`, () => {
+    expect(utils.parallelViewLeftLineType({})).toContain(EMPTY_CELL_TYPE);
+  });
+
+  it(`should return hll:true`, () => {
+    expect(utils.parallelViewLeftLineType({}, true)[1]).toEqual({ hll: true });
+  });
+});
+
+describe('shouldShowCommentButton', () => {
+  it.each`
+    hover    | context  | meta     | discussions | expectation
+    ${true}  | ${false} | ${false} | ${false}    | ${true}
+    ${false} | ${false} | ${false} | ${false}    | ${false}
+    ${true}  | ${true}  | ${false} | ${false}    | ${false}
+    ${true}  | ${true}  | ${true}  | ${false}    | ${false}
+    ${true}  | ${true}  | ${true}  | ${true}     | ${false}
+  `(
+    'should return $expectation when hover is $hover',
+    ({ hover, context, meta, discussions, expectation }) => {
+      expect(utils.shouldShowCommentButton(hover, context, meta, discussions)).toBe(expectation);
+    },
+  );
+});