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[feature] Add tests to PlayfairCipher

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	`1`	`+packagecom.thealgorithms.ciphers;`
	`2`	`+`
	`3`	`+importstaticorg.junit.jupiter.api.Assertions.assertEquals;`
	`4`	`+importstaticorg.junit.jupiter.api.Assertions.assertNotEquals;`
	`5`	`+importstaticorg.junit.jupiter.api.Assertions.assertTrue;`
	`6`	`+`
	`7`	`+importjava.lang.reflect.Method;`
	`8`	`+importjava.util.Arrays;`
	`9`	`+`
	`10`	`+importorg.junit.jupiter.api.BeforeEach;`
	`11`	`+importorg.junit.jupiter.api.Test;`
	`12`	`+`
	`13`	`+publicclassMyPlayfairCipherTest {`
	`14`	`+privatePlayfairCipherplayfair;`
	`15`	`+privatefinalStringkeyword ="KEYWORD";`
	`16`	`+`
	`17`	`+@BeforeEach`
	`18`	`+publicvoidsetup() {`
	`19`	`+playfair =newPlayfairCipher(keyword);`
	`20`	`+ }`
	`21`	`+`
	`22`	`+@Test`
	`23`	`+voidshouldEncryptAndDecryptDuringSameRowDigraph() {`
	`24`	`+Stringplaintext =keyword.substring(0,2);`
	`25`	`+`
	`26`	`+Stringencrypted =playfair.encrypt(plaintext);`
	`27`	`+Stringdecrypted =playfair.decrypt(encrypted);`
	`28`	`+`
	`29`	`+assertEquals(plaintext,decrypted,"Should not decrypt to the same letters");`
	`30`	`+ }`
	`31`	`+`
	`32`	`+@Test`
	`33`	`+voidshouldPadOddLengthplaintext() {`
	`34`	`+Stringplaintext ="cat";`
	`35`	`+`
	`36`	`+Stringencrypted =playfair.encrypt(plaintext);`
	`37`	`+`
	`38`	`+assertTrue(encrypted.length() %2 ==0,"Should be even length");`
	`39`	`+ }`
	`40`	`+}`

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