Commit25add22

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"test: add missing coverage for Substitution Cipher decryption edge cases"

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Original file line number	Diff line number	Diff line change
`@@ -27,4 +27,18 @@ describe('Substitution Cipher', () => {`
`27`	`27`	`RangeError`
`28`	`28`	`)`
`29`	`29`	`})`
	`30`	`+it('encrypts using default key if none provided',()=>{`
	`31`	`+constencrypted=substitutionCipherEncryption('HELLO WORLD')`
	`32`	`+expect(encrypted).toBe('ITSSG VGKSR')`
	`33`	`+})`
	`34`	`+`
	`35`	`+it('decrypts using default key if none provided',()=>{`
	`36`	`+constdecrypted=substitutionCipherDecryption('ITSSG VGKSR')`
	`37`	`+expect(decrypted).toBe('HELLO WORLD')`
	`38`	`+})`
	`39`	`+`
	`40`	`+it('throws error for invalid key in decryption',()=>{`
	`41`	`+expect(()=>substitutionCipherDecryption('HELLO','BADKEY')).toThrow(RangeError)`
	`42`	`+})`
	`43`	`+`
`30`	`44`	`})`

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