1 files changed, 101 insertions, 0 deletions
diff --git a/spec/frontend/lib/utils/number_utility_spec.js b/spec/frontend/lib/utils/number_utility_spec.js
new file mode 100644
index 00000000000..818404bad81
--- /dev/null
+++ b/spec/frontend/lib/utils/number_utility_spec.js
@@ -0,0 +1,101 @@
+import {
+  formatRelevantDigits,
+  bytesToKiB,
+  bytesToMiB,
+  bytesToGiB,
+  numberToHumanSize,
+  sum,
+} from '~/lib/utils/number_utils';
+
+describe('Number Utils', () => {
+  describe('formatRelevantDigits', () => {
+    it('returns an empty string when the number is NaN', () => {
+      expect(formatRelevantDigits('fail')).toBe('');
+    });
+
+    it('returns 4 decimals when there is 4 plus digits to the left', () => {
+      const formattedNumber = formatRelevantDigits('1000.1234567');
+      const rightFromDecimal = formattedNumber.split('.')[1];
+      const leftFromDecimal = formattedNumber.split('.')[0];
+
+      expect(rightFromDecimal.length).toBe(4);
+      expect(leftFromDecimal.length).toBe(4);
+    });
+
+    it('returns 3 decimals when there is 1 digit to the left', () => {
+      const formattedNumber = formatRelevantDigits('0.1234567');
+      const rightFromDecimal = formattedNumber.split('.')[1];
+      const leftFromDecimal = formattedNumber.split('.')[0];
+
+      expect(rightFromDecimal.length).toBe(3);
+      expect(leftFromDecimal.length).toBe(1);
+    });
+
+    it('returns 2 decimals when there is 2 digits to the left', () => {
+      const formattedNumber = formatRelevantDigits('10.1234567');
+      const rightFromDecimal = formattedNumber.split('.')[1];
+      const leftFromDecimal = formattedNumber.split('.')[0];
+
+      expect(rightFromDecimal.length).toBe(2);
+      expect(leftFromDecimal.length).toBe(2);
+    });
+
+    it('returns 1 decimal when there is 3 digits to the left', () => {
+      const formattedNumber = formatRelevantDigits('100.1234567');
+      const rightFromDecimal = formattedNumber.split('.')[1];
+      const leftFromDecimal = formattedNumber.split('.')[0];
+
+      expect(rightFromDecimal.length).toBe(1);
+      expect(leftFromDecimal.length).toBe(3);
+    });
+  });
+
+  describe('bytesToKiB', () => {
+    it('calculates KiB for the given bytes', () => {
+      expect(bytesToKiB(1024)).toEqual(1);
+      expect(bytesToKiB(1000)).toEqual(0.9765625);
+    });
+  });
+
+  describe('bytesToMiB', () => {
+    it('calculates MiB for the given bytes', () => {
+      expect(bytesToMiB(1048576)).toEqual(1);
+      expect(bytesToMiB(1000000)).toEqual(0.95367431640625);
+    });
+  });
+
+  describe('bytesToGiB', () => {
+    it('calculates GiB for the given bytes', () => {
+      expect(bytesToGiB(1073741824)).toEqual(1);
+      expect(bytesToGiB(10737418240)).toEqual(10);
+    });
+  });
+
+  describe('numberToHumanSize', () => {
+    it('should return bytes', () => {
+      expect(numberToHumanSize(654)).toEqual('654 bytes');
+    });
+
+    it('should return KiB', () => {
+      expect(numberToHumanSize(1079)).toEqual('1.05 KiB');
+    });
+
+    it('should return MiB', () => {
+      expect(numberToHumanSize(10485764)).toEqual('10.00 MiB');
+    });
+
+    it('should return GiB', () => {
+      expect(numberToHumanSize(10737418240)).toEqual('10.00 GiB');
+    });
+  });
+
+  describe('sum', () => {
+    it('should add up two values', () => {
+      expect(sum(1, 2)).toEqual(3);
+    });
+
+    it('should add up all the values in an array when passed to a reducer', () => {
+      expect([1, 2, 3, 4, 5].reduce(sum)).toEqual(15);
+    });
+  });
+});