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testing: improve test coverage SortedLinkedListTest #6388

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Merged
merged 4 commits into from
Jul 17, 2025
Merged

testing: improve test coverage SortedLinkedListTest #6388

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6e48ce8
testing: improve test coverage SortedLinkedListTest
alxkm Jul 14, 2025
8ee8d24
checkstyle: fix comments formatting
alxkm Jul 14, 2025
262f8e8
checkstyle: fix formatting
alxkm Jul 14, 2025
e95087f
Merge branch 'master' into testing/SortedLinkedListTest
alxkm Jul 17, 2025
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77 changes: 77 additions & 0 deletions src/test/java/com/thealgorithms/datastructures/lists/SortedLinkedListTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -128,4 +128,81 @@ public void testIsEmptyAfterDeletion() {
list.delete(10);
assertTrue(list.isEmpty());
}

@Test
public void testInsertNegativeNumbers() {
list.insert(-10);
list.insert(-5);
list.insert(-20);
assertEquals("[-20, -10, -5]", list.toString());
}

@Test
public void testInsertMixedPositiveAndNegativeNumbers() {
list.insert(0);
list.insert(-1);
list.insert(1);
assertEquals("[-1, 0, 1]", list.toString());
}

@Test
public void testMultipleDeletesUntilEmpty() {
list.insert(2);
list.insert(4);
list.insert(6);
assertTrue(list.delete(4));
assertTrue(list.delete(2));
assertTrue(list.delete(6));
assertTrue(list.isEmpty());
assertEquals("[]", list.toString());
}

@Test
public void testDeleteDuplicateValuesOnlyDeletesOneInstance() {
list.insert(5);
list.insert(5);
list.insert(5);
assertTrue(list.delete(5));
assertEquals("[5, 5]", list.toString());
assertTrue(list.delete(5));
assertEquals("[5]", list.toString());
assertTrue(list.delete(5));
assertEquals("[]", list.toString());
}

@Test
public void testSearchOnListWithDuplicates() {
list.insert(7);
list.insert(7);
list.insert(7);
assertTrue(list.search(7));
assertFalse(list.search(10));
}

@Test
public void testToStringOnEmptyList() {
assertEquals("[]", list.toString());
}

@Test
public void testDeleteAllDuplicates() {
list.insert(4);
list.insert(4);
list.insert(4);
assertTrue(list.delete(4));
assertTrue(list.delete(4));
assertTrue(list.delete(4));
assertFalse(list.delete(4)); // nothing left to delete
assertEquals("[]", list.toString());
}

@Test
public void testInsertAfterDeletion() {
list.insert(1);
list.insert(3);
list.insert(5);
assertTrue(list.delete(3));
list.insert(2);
assertEquals("[1, 2, 5]", list.toString());
}
}
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