add Parameterized test

src/test/java/CalculatorParamTest.java

+import junit.framework.TestCase;
+import org.junit.*;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+import java.util.Arrays;
+import java.util.Collection;
+
+@RunWith(Parameterized.class)
+public class CalculatorParamTest extends TestCase {
+
+    Calculator calculator;
+    int x;
+    int y;
+    int result;
+
+    @Before
+    public void init(){
+        this.calculator = new Calculator();
+    }
+
+    public CalculatorParamTest(int x, int y, int result) {
+        this.x = x;
+        this.y = y;
+        this.result = result;
+    }
+
+    @Parameterized.Parameters
+    public static Collection sums() {
+        return Arrays.asList(new Object[][] {
+                { 1, 2, 3 },
+                { 10, 5, 15 },
+        });
+    }
+
+    @Test
+    public void subTest2(){
+        Assert.assertEquals(result, calculator.add(x,y));
+    }
+}

src/test/java/CalculatorTest2.java

-import org.junit.*;
-
-
-public class CalculatorTest2 {
-
-    @Test
-    public void subTest1() throws InterruptedException {
-        int result = new Calculator().subtract(10,2);
-        Thread.sleep(1000);
-        Assert.assertTrue("Subtracting two numbers test case failed - 1", result == 8);
-    }
-
-    @Test
-    public void subTest2(){
-        int result = new Calculator().subtract(20,5);
-        Assert.assertTrue("Subtracting two numbers test case failed - 2", result == 15);
-    }
-}

src/test/java/TestSuite.java

@@ -2,7 +2,7 @@ import org.junit.runner.RunWith;
 import org.junit.runners.Suite;
 
 @RunWith(Suite.class)
-@Suite.SuiteClasses({CalculatorTest.class, CalculatorTest2.class})
+@Suite.SuiteClasses({CalculatorTest.class, CalculatorParamTest.class})
 public class TestSuite {
 
 }