diff --git a/test/getColonTimeFromDate.test.js b/test/getColonTimeFromDate.test.js
index 6d14dee94..8371c58b6 100644
--- a/test/getColonTimeFromDate.test.js
+++ b/test/getColonTimeFromDate.test.js
@@ -4,3 +4,7 @@ const {getColonTimeFromDate} = require('./_30s.js');
 test('getColonTimeFromDate is a Function', () => {
   expect(getColonTimeFromDate).toBeInstanceOf(Function);
 });
+test('Gets the time in the proper format.', () => {
+  let date = new Date();
+  expect(getColonTimeFromDate(date)).toEqual(date.toTimeString().slice(0, 8));
+});
\ No newline at end of file
diff --git a/test/getMeridiemSuffixOfInteger.test.js b/test/getMeridiemSuffixOfInteger.test.js
index 99a8bfe47..9b617edc8 100644
--- a/test/getMeridiemSuffixOfInteger.test.js
+++ b/test/getMeridiemSuffixOfInteger.test.js
@@ -4,3 +4,18 @@ const {getMeridiemSuffixOfInteger} = require('./_30s.js');
 test('getMeridiemSuffixOfInteger is a Function', () => {
   expect(getMeridiemSuffixOfInteger).toBeInstanceOf(Function);
 });
+test('Gets the correct meridiem suffix.', () => {
+  expect(getMeridiemSuffixOfInteger(0)).toEqual('12am');
+});
+test('Gets the correct meridiem suffix.', () => {
+  expect(getMeridiemSuffixOfInteger(11)).toEqual('11am');
+});
+test('Gets the correct meridiem suffix.', () => {
+  expect(getMeridiemSuffixOfInteger(12)).toEqual('12pm');
+});
+test('Gets the correct meridiem suffix.', () => {
+  expect(getMeridiemSuffixOfInteger(13)).toEqual('1pm');
+});
+test('Gets the correct meridiem suffix.', () => {
+  expect(getMeridiemSuffixOfInteger(25)).toEqual('1pm');
+});
diff --git a/test/initializeArrayWithRangeRight.test.js b/test/initializeArrayWithRangeRight.test.js
index 8bfbc0c86..809c0d551 100644
--- a/test/initializeArrayWithRangeRight.test.js
+++ b/test/initializeArrayWithRangeRight.test.js
@@ -4,3 +4,12 @@ const {initializeArrayWithRangeRight} = require('./_30s.js');
 test('initializeArrayWithRangeRight is a Function', () => {
   expect(initializeArrayWithRangeRight).toBeInstanceOf(Function);
 });
+test('Initializes an array containing the numbers in the specified range (witout start value)', () => {
+  expect(initializeArrayWithRangeRight(5)).toEqual([5, 4, 3, 2, 1, 0]);
+});
+test('Initializes an array containing the numbers in the specified range', () => {
+  expect(initializeArrayWithRangeRight(7, 3)).toEqual([7, 6, 5, 4, 3]);
+});
+test('Initializes an array containing the numbers in the specified range (with step)', () => {
+  expect(initializeArrayWithRangeRight(9, 0, 2)).toEqual([8, 6, 4, 2, 0]);
+});