From ac451a0eeac46c576c19e40509d5342424db3a0a Mon Sep 17 00:00:00 2001 From: alxkm Date: Sun, 20 Jul 2025 23:58:44 +0200 Subject: [PATCH] testing: improve StackArrayTest --- .../datastructures/stacks/StackArrayTest.java | 58 +++++++++++++++++++ 1 file changed, 58 insertions(+) diff --git a/src/test/java/com/thealgorithms/datastructures/stacks/StackArrayTest.java b/src/test/java/com/thealgorithms/datastructures/stacks/StackArrayTest.java index 74de7ad6435a..392cdf2329fc 100644 --- a/src/test/java/com/thealgorithms/datastructures/stacks/StackArrayTest.java +++ b/src/test/java/com/thealgorithms/datastructures/stacks/StackArrayTest.java @@ -126,4 +126,62 @@ void testToString() { stack.push(3); Assertions.assertEquals("StackArray [1, 2, 3]", stack.toString()); } + + @Test + void testSingleElementOperations() { + // Test operations with a single element + stack.push(2); + Assertions.assertEquals(1, stack.size()); + Assertions.assertFalse(stack.isEmpty()); + Assertions.assertEquals(2, stack.peek()); + Assertions.assertEquals(2, stack.pop()); + Assertions.assertTrue(stack.isEmpty()); + } + + @Test + void testAlternatingPushPop() { + // Test alternating push and pop operations + stack.push(1); + Assertions.assertEquals(1, stack.pop()); + + stack.push(2); + stack.push(3); + Assertions.assertEquals(3, stack.pop()); + + stack.push(4); + Assertions.assertEquals(4, stack.pop()); + Assertions.assertEquals(2, stack.pop()); + Assertions.assertTrue(stack.isEmpty()); + } + + @Test + void testPushNullElements() { + // Test pushing null values + stack.push(null); + Assertions.assertEquals(1, stack.size()); + Assertions.assertNull(stack.peek()); + Assertions.assertNull(stack.pop()); + + // Mix null and non-null values + stack.push(1); + stack.push(null); + stack.push(2); + + Assertions.assertEquals(2, stack.pop()); + Assertions.assertNull(stack.pop()); + Assertions.assertEquals(1, stack.pop()); + } + + @Test + void testWithDifferentDataTypes() { + // Test with String type + StackArray stringStack = new StackArray<>(3); + stringStack.push("first"); + stringStack.push("second"); + stringStack.push("third"); + + Assertions.assertEquals("third", stringStack.pop()); + Assertions.assertEquals("second", stringStack.peek()); + Assertions.assertEquals(2, stringStack.size()); + } } pFad - Phonifier reborn

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