diff --git a/Conversions/RailwayTimeConversion.js b/Conversions/RailwayTimeConversion.js
index fd4f9a5dad..15f837b0da 100644
--- a/Conversions/RailwayTimeConversion.js
+++ b/Conversions/RailwayTimeConversion.js
@@ -18,7 +18,7 @@
const RailwayTimeConversion = (timeString) => {
// firstly, check that input is a string or not.
if (typeof timeString !== 'string') {
- return new TypeError('Argument is not a string.')
+ throw new TypeError('Argument is not a string.')
}
// split the string by ':' character.
const [hour, minute, secondWithShift] = timeString.split(':')
diff --git a/Conversions/test/RailwayTimeConversion.test.js b/Conversions/test/RailwayTimeConversion.test.js
index 0e49af3b7f..6579420049 100644
--- a/Conversions/test/RailwayTimeConversion.test.js
+++ b/Conversions/test/RailwayTimeConversion.test.js
@@ -19,3 +19,7 @@ test('The RailwayTimeConversion of 11:20:00PM is 23:20:00', () => {
const res = RailwayTimeConversion('11:20:00PM')
expect(res).toEqual('23:20:00')
})
+
+test('The RailwayTimeConversion throws when input is not a string', () => {
+ expect(() => RailwayTimeConversion(1120)).toThrowError()
+})
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