Update unit tests and add performance analyze

src/test/java/com/cleverthis/interview/SolutionTestBase.java

@@ -0,0 +1,30 @@
+package com.cleverthis.interview;
+
+import com.cleverthis.interview.padlock.PadlockImpl;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * This is a base class for verifying the correctness of the solution.
+ */
+public abstract class SolutionTestBase {
+    
+    /**
+     * Implement your solution in this function.
+     * */
+    protected abstract void solve(PadlockImpl padlock);
+
+    protected void verify(int numpadSize) {
+        PadlockImpl padlock = new PadlockImpl(numpadSize);
+        solve(padlock);
+        assertTrue(padlock.isPasscodeCorrect());
+    }
+
+    @Test
+    void verify1to7() {
+        for (int i = 1; i <= 7; i++) {
+            verify(i);
+        }
+    }
+}