rename folder to data_structures

data_structures/queue/test_queue.cpp

@@ -0,0 +1,41 @@
+#include <iostream>
+#include <string>
+#include "queue.cpp"
+#include "queue.h"
+
+using namespace std;
+
+int main() {
+    queue<string> q;
+    cout << "---------------------- Test construct ----------------------"
+         << endl;
+    q.display();
+    cout << "---------------------- Test isEmptyQueue ----------------------"
+         << endl;
+    if (q.isEmptyQueue())
+        cout << "PASS" << endl;
+    else
+        cout << "FAIL" << endl;
+    cout << "---------------------- Test enQueue ----------------------"
+         << endl;
+    cout << "After Hai, Jeff, Tom, Jkingston go into queue: " << endl;
+    q.enQueue("Hai");
+    q.enQueue("Jeff");
+    q.enQueue("Tom");
+    q.enQueue("Jkingston");
+    q.display();
+    cout << "---------------------- Test front ----------------------" << endl;
+    string value = q.front();
+    if (value == "Hai")
+        cout << "PASS" << endl;
+    else
+        cout << "FAIL" << endl;
+    cout << "---------------------- Test deQueue ----------------------"
+         << endl;
+    q.display();
+    q.deQueue();
+    q.deQueue();
+    cout << "After Hai, Jeff left the queue: " << endl;
+    q.display();
+    return 0;
+}