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testing: improving CRCAlgorithmTest (#6403)

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* testing: improving CRCAlgorithmTest

* style: fix formatting

---------

Co-authored-by: Deniz Altunkapan <93663085+DenizAltunkapan@users.noreply.github.com>
This commit is contained in:
Oleksandr Klymenko
2025-07-20 11:03:23 +03:00
committed by GitHub
parent c7af421dfa
commit 171fdc9925
1 changed files with 64 additions and 11 deletions
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75
src/test/java/com/thealgorithms/others/CRCAlgorithmTest.java
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@@ -1,29 +1,82 @@
package com.thealgorithms.others;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
import org.junit.jupiter.api.Test;
public class CRCAlgorithmTest {
@Test
void test1() {
void testNoErrorsWithZeroBER() {
CRCAlgorithm c = new CRCAlgorithm("10010101010100101010010000001010010101010", 10, 0.0);
// A bit-error rate of 0.0 should not provide any wrong messages
c.changeMess();
c.generateRandomMess();
c.divideMessageWithP(false);
assertEquals(c.getWrongMess(), 0);
c.changeMess();
c.divideMessageWithP(true);
assertEquals(0, c.getWrongMess(), "BER=0 should produce no wrong messages");
assertEquals(0, c.getWrongMessCaught(), "No errors, so no caught wrong messages");
assertEquals(0, c.getWrongMessNotCaught(), "No errors, so no uncaught wrong messages");
assertTrue(c.getCorrectMess() > 0, "Should have some correct messages");
}
@Test
void test2() {
void testAllErrorsWithBEROne() {
CRCAlgorithm c = new CRCAlgorithm("10010101010100101010010000001010010101010", 10, 1.0);
// A bit error rate of 1.0 should not provide any correct messages
c.changeMess();
c.generateRandomMess();
c.divideMessageWithP(false);
assertEquals(c.getCorrectMess(), 0);
c.changeMess();
c.divideMessageWithP(true);
assertTrue(c.getWrongMess() > 0, "BER=1 should produce wrong messages");
assertEquals(0, c.getCorrectMess(), "BER=1 should produce no correct messages");
}
@Test
void testIntermediateBER() {
CRCAlgorithm c = new CRCAlgorithm("1101", 4, 0.5);
c.generateRandomMess();
for (int i = 0; i < 1000; i++) {
c.refactor();
c.generateRandomMess();
c.divideMessageWithP(false);
c.changeMess();
c.divideMessageWithP(true);
}
assertTrue(c.getWrongMess() > 0, "Some wrong messages expected with BER=0.5");
assertTrue(c.getWrongMessCaught() >= 0, "Wrong messages caught counter >= 0");
assertTrue(c.getWrongMessNotCaught() >= 0, "Wrong messages not caught counter >= 0");
assertTrue(c.getCorrectMess() >= 0, "Correct messages counter >= 0");
assertEquals(c.getWrongMess(), c.getWrongMessCaught() + c.getWrongMessNotCaught(), "Sum of caught and not caught wrong messages should equal total wrong messages");
}
@Test
void testMessageChangedFlag() {
CRCAlgorithm c = new CRCAlgorithm("1010", 4, 1.0);
c.generateRandomMess();
c.divideMessageWithP(false);
c.changeMess();
assertTrue(c.getWrongMess() > 0, "Message should be marked as changed with BER=1");
}
@Test
void testSmallMessageSize() {
CRCAlgorithm c = new CRCAlgorithm("11", 2, 0.0);
c.generateRandomMess();
c.divideMessageWithP(false);
c.changeMess();
c.divideMessageWithP(true);
assertEquals(0, c.getWrongMess(), "No errors expected for BER=0 with small message");
}
@Test
void testLargeMessageSize() {
CRCAlgorithm c = new CRCAlgorithm("1101", 1000, 0.01);
c.generateRandomMess();
c.divideMessageWithP(false);
c.changeMess();
c.divideMessageWithP(true);
// Just ensure counters are updated, no exceptions
assertTrue(c.getWrongMess() >= 0);
assertTrue(c.getCorrectMess() >= 0);
}
}