diff --git a/Conversions/test/DecimalToBinary.test.js b/Conversions/test/DecimalToBinary.test.js
new file mode 100644
index 0000000000..b3a26e1b76
--- /dev/null
+++ b/Conversions/test/DecimalToBinary.test.js
@@ -0,0 +1,26 @@
+import { decimalToBinary } from '../DecimalToBinary'
+
+test('The Binary representation of 35 is 100011', () => {
+  const res = decimalToBinary(35)
+  expect(res).toBe('100011')
+})
+
+test('The Binary representation of 1 is 1', () => {
+  const res = decimalToBinary(1)
+  expect(res).toBe('1')
+})
+
+test('The Binary representation of 1000 is 1111101000', () => {
+  const res = decimalToBinary(1000)
+  expect(res).toBe('1111101000')
+})
+
+test('The Binary representation of 2 is 10', () => {
+  const res = decimalToBinary(2)
+  expect(res).toBe('10')
+})
+
+test('The Binary representation of 17 is 10001', () => {
+  const res = decimalToBinary(17)
+  expect(res).toBe('10001')
+})
diff --git a/Conversions/test/DecimalToOctal.test.js b/Conversions/test/DecimalToOctal.test.js
new file mode 100644
index 0000000000..0e4214b0c6
--- /dev/null
+++ b/Conversions/test/DecimalToOctal.test.js
@@ -0,0 +1,26 @@
+import { decimalToOctal } from '../DecimalToOctal'
+
+test('The Octal representation of 8 is 10', () => {
+  const res = decimalToOctal(8)
+  expect(res).toBe(10)
+})
+
+test('The Octal representation of 1 is 1', () => {
+  const res = decimalToOctal(1)
+  expect(res).toBe(1)
+})
+
+test('The Octal representation of 0 is 0', () => {
+  const res = decimalToOctal(0)
+  expect(res).toBe(0)
+})
+
+test('The Octal representation of 100 is 144', () => {
+  const res = decimalToOctal(100)
+  expect(res).toBe(144)
+})
+
+test('The Octal representation of 111 is 157', () => {
+  const res = decimalToOctal(111)
+  expect(res).toBe(157)
+})
diff --git a/Conversions/test/OctToDecimal.test.js b/Conversions/test/OctToDecimal.test.js
new file mode 100644
index 0000000000..d36327508d
--- /dev/null
+++ b/Conversions/test/OctToDecimal.test.js
@@ -0,0 +1,26 @@
+import { octalToDecimal } from '../OctToDecimal'
+
+test('The Decimal representation of Octal number 56 is 46', () => {
+  const res = octalToDecimal(56)
+  expect(res).toBe(46)
+})
+
+test('The Decimal representation of Octal number 99 is 81', () => {
+  const res = octalToDecimal(99)
+  expect(res).toBe(81)
+})
+
+test('The Decimal representation of Octal number 17 is 15', () => {
+  const res = octalToDecimal(17)
+  expect(res).toBe(15)
+})
+
+test('The Decimal representation of Octal number 100 is 64', () => {
+  const res = octalToDecimal(100)
+  expect(res).toBe(64)
+})
+
+test('The Decimal representation of Octal number 0 is 0', () => {
+  const res = octalToDecimal(0)
+  expect(res).toBe(0)
+})