Char stack (#6248)

* Corrected Package name

* Char stack

* Changed file names

core-java-collections/src/test/java/com/baeldung/charstack/CharStackUnitTest.java

@@ -0,0 +1,50 @@
+package com.baeldung.charstack;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class CharStackUnitTest {
+
+    @Test
+    public void whenCharStackIsCreated_thenItHasSize0() {
+
+        CharStack charStack = new CharStack();
+
+        assertEquals(0, charStack.size());
+    }
+
+    @Test
+    public void givenEmptyCharStack_whenElementIsPushed_thenStackSizeisIncreased() {
+
+        CharStack charStack = new CharStack();
+
+        charStack.push('A');
+
+        assertEquals(1, charStack.size());
+    }
+
+    @Test
+    public void givenCharStack_whenElementIsPoppedFromStack_thenElementIsRemovedAndSizeChanges() {
+
+        CharStack charStack = new CharStack();
+        charStack.push('A');
+
+        char element = charStack.pop();
+
+        assertEquals('A', element);
+        assertEquals(0, charStack.size());
+    }
+
+    @Test
+    public void givenCharStack_whenElementIsPeeked_thenElementIsNotRemovedAndSizeDoesNotChange() {
+        CharStack charStack = new CharStack();
+        charStack.push('A');
+
+        char element = charStack.peek();
+
+        assertEquals('A', element);
+        assertEquals(1, charStack.size());
+    }
+
+}

core-java-collections/src/test/java/com/baeldung/charstack/CharStackUsingJavaUnitTest.java

@@ -0,0 +1,53 @@
+package com.baeldung.charstack;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.Stack;
+
+import org.junit.jupiter.api.Test;
+
+public class CharStackUsingJavaUnitTest {
+
+    @Test
+    public void whenCharStackIsCreated_thenItHasSize0() {
+
+        Stack<Character> charStack = new Stack<>();
+
+        assertEquals(0, charStack.size());
+    }
+
+    @Test
+    public void givenEmptyCharStack_whenElementIsPushed_thenStackSizeisIncreased() {
+
+        Stack<Character> charStack = new Stack<>();
+
+        charStack.push('A');
+
+        assertEquals(1, charStack.size());
+    }
+
+    @Test
+    public void givenCharStack_whenElementIsPoppedFromStack_thenElementIsRemovedAndSizeChanges() {
+
+        Stack<Character> charStack = new Stack<>();
+        charStack.push('A');
+
+        char element = charStack.pop();
+
+        assertEquals('A', element);
+        assertEquals(0, charStack.size());
+    }
+
+    @Test
+    public void givenCharStack_whenElementIsPeeked_thenElementIsNotRemovedAndSizeDoesNotChange() {
+
+        Stack<Character> charStack = new Stack<>();
+        charStack.push('A');
+
+        char element = charStack.peek();
+
+        assertEquals('A', element);
+        assertEquals(1, charStack.size());
+    }
+
+}

core-java-collections/src/test/java/com/baeldung/charstack/CharStackWithArrayUnitTest.java

@@ -0,0 +1,65 @@
+package com.baeldung.charstack;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class CharStackWithArrayUnitTest {
+
+    @Test
+    public void whenCharStackIsCreated_thenItHasSize0() {
+
+        CharStackWithArray charStack = new CharStackWithArray();
+
+        assertEquals(0, charStack.size());
+    }
+
+    @Test
+    public void givenEmptyCharStack_whenElementIsPushed_thenStackSizeisIncreased() {
+
+        CharStackWithArray charStack = new CharStackWithArray();
+
+        charStack.push('A');
+
+        assertEquals(1, charStack.size());
+    }
+
+    @Test
+    public void givenEmptyCharStack_when5ElementIsPushed_thenStackSizeis() {
+
+        CharStackWithArray charStack = new CharStackWithArray();
+
+        charStack.push('A');
+        charStack.push('B');
+        charStack.push('C');
+        charStack.push('D');
+        charStack.push('E');
+
+        assertEquals(5, charStack.size());
+    }
+
+    @Test
+    public void givenCharStack_whenElementIsPoppedFromStack_thenElementIsRemovedAndSizeChanges() {
+
+        CharStackWithArray charStack = new CharStackWithArray();
+        charStack.push('A');
+
+        char element = charStack.pop();
+
+        assertEquals('A', element);
+        assertEquals(0, charStack.size());
+    }
+
+    @Test
+    public void givenCharStack_whenElementIsPeeked_thenElementIsNotRemovedAndSizeDoesNotChange() {
+
+        CharStackWithArray charStack = new CharStackWithArray();
+        charStack.push('A');
+
+        char element = charStack.peek();
+
+        assertEquals('A', element);
+        assertEquals(1, charStack.size());
+    }
+
+}

core-java-collections/src/test/java/com/baeldung/queueinterface/CustomBaeldungQueueUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.queueinterface;
+package com.baeldung.queueInterface;
 
 import org.junit.Before;
 import org.junit.Test;

core-java-collections/src/test/java/com/baeldung/queueinterface/PriorityQueueUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.queueinterface;
+package com.baeldung.queueInterface;
 
 import org.junit.Before;
 import org.junit.Test;