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testing: improvingCRCAlgorithmTest#6403
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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 | ||
| voidtestNoErrorsWithZeroBER() { | ||
| CRCAlgorithm c = new CRCAlgorithm("10010101010100101010010000001010010101010", 10, 0.0); | ||
| c.generateRandomMess(); | ||
| c.divideMessageWithP(false); | ||
| 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 | ||
| voidtestAllErrorsWithBEROne() { | ||
| CRCAlgorithm c = new CRCAlgorithm("10010101010100101010010000001010010101010", 10, 1.0); | ||
| c.generateRandomMess(); | ||
| c.divideMessageWithP(false); | ||
| 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); | ||
| } | ||
| } |
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