Add latest changes from gitlab-org/gitlab@master

2 files changed, 51 insertions, 0 deletions

diff --git a/spec/frontend/lib/utils/chart_utils_spec.js b/spec/frontend/lib/utils/chart_utils_spec.js
new file mode 100644
index 00000000000..e811b8405fb
--- /dev/null
+++ b/spec/frontend/lib/utils/chart_utils_spec.js
@@ -0,0 +1,11 @@
+import { firstAndLastY } from '~/lib/utils/chart_utils';
+
+describe('Chart utils', () => {
+  describe('firstAndLastY', () => {
+    it('returns the first and last y-values of a given data set as an array', () => {
+      const data = [['', 1], ['', 2], ['', 3]];
+
+      expect(firstAndLastY(data)).toEqual([1, 3]);
+    });
+  });
+});
diff --git a/spec/frontend/lib/utils/number_utility_spec.js b/spec/frontend/lib/utils/number_utility_spec.js
index 381d7c6f8d9..2f8f1092612 100644
--- a/spec/frontend/lib/utils/number_utility_spec.js
+++ b/spec/frontend/lib/utils/number_utility_spec.js
@@ -7,6 +7,8 @@ import {
   sum,
   isOdd,
   median,
+  changeInPercent,
+  formattedChangeInPercent,
 } from '~/lib/utils/number_utils';
 
 describe('Number Utils', () => {
@@ -122,4 +124,42 @@ describe('Number Utils', () => {
       expect(median(items)).toBe(14.5);
     });
   });
+
+  describe('changeInPercent', () => {
+    it.each`
+      firstValue | secondValue | expectedOutput
+      ${99}      | ${100}      | ${1}
+      ${100}     | ${99}       | ${-1}
+      ${0}       | ${99}       | ${Infinity}
+      ${2}       | ${2}        | ${0}
+      ${-100}    | ${-99}      | ${1}
+    `(
+      'computes the change between $firstValue and $secondValue in percent',
+      ({ firstValue, secondValue, expectedOutput }) => {
+        expect(changeInPercent(firstValue, secondValue)).toBe(expectedOutput);
+      },
+    );
+  });
+
+  describe('formattedChangeInPercent', () => {
+    it('prepends "%" to the output', () => {
+      expect(formattedChangeInPercent(1, 2)).toMatch(/%$/);
+    });
+
+    it('indicates if the change was a decrease', () => {
+      expect(formattedChangeInPercent(100, 99)).toContain('-1');
+    });
+
+    it('indicates if the change was an increase', () => {
+      expect(formattedChangeInPercent(99, 100)).toContain('+1');
+    });
+
+    it('shows "-" per default if the change can not be expressed in an integer', () => {
+      expect(formattedChangeInPercent(0, 1)).toBe('-');
+    });
+
+    it('shows the given fallback if the change can not be expressed in an integer', () => {
+      expect(formattedChangeInPercent(0, 1, { nonFiniteResult: '*' })).toBe('*');
+    });
+  });
 });