Fully functional

Added the String Calculator to Github

StringCalculator/test/session1/StringCalculatorTest.java

@@ -0,0 +1,74 @@
+package session1;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+public class StringCalculatorTest {
+	public StringCalculator calculator = new StringCalculator();
+
+	@Test
+	public void empty_String_Return_Zero() {
+		// Arrange
+		String numbers = "";
+
+		// Act
+		int result = calculator.add(numbers);
+
+		// Assert
+		assertEquals(0, result);
+	}
+
+	@Test
+	public void non_Empty_String_Return_3() throws Exception {
+		String numbers = "3";
+		
+		int result = calculator.add(numbers);
+		
+		assertEquals(3, result);
+	}
+	@Test
+	public void comma_Separated_Return_Sum() throws Exception {
+		String numbers = "2,3";
+		
+		int result = calculator.add(numbers);
+		
+		assertEquals(5, result);
+	}
+	
+	@Test
+	public void handle_Newlines_As_Commas() throws Exception {
+		String numbers = "4\n3";
+		
+		int result = calculator.add(numbers);
+		
+		assertEquals(7, result);
+	}
+	
+	@Test
+	public void double_Separators_Throws_Exception() throws Exception {
+		try {
+			calculator.add("4\n,5");
+			fail();
+		}catch (CalculateException e) {
+			assertEquals("Two separators found.", e.getMessage());
+		}
+	}
+	@Test
+	public void handle_Other_Delimiters() throws Exception {
+		String numbers = "//;\n5;6"; 
+		
+		int result = calculator.add(numbers);
+		
+		assertEquals(11, result);
+	}
+	@Test
+	public void no_Negatives_Allowed() throws Exception {
+		try {
+			calculator.add("3,-4");
+			fail();
+		}catch (CalculateException e) {
+			assertEquals("Negatives not allowed", e.getMessage());
+		}
+	}
+}