diff --git a/LambdaDemo/.classpath b/LambdaDemo/.classpath
index fb50116..3e0fb27 100644
--- a/LambdaDemo/.classpath
+++ b/LambdaDemo/.classpath
@@ -2,5 +2,6 @@
 <classpath>
 	<classpathentry kind="src" path="src"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/4"/>
 	<classpathentry kind="output" path="bin"/>
 </classpath>
diff --git a/LambdaDemo/src/predicate/PredicateDemo.java b/LambdaDemo/src/predicate/PredicateDemo.java
index 7d8a699..a7eb08e 100644
--- a/LambdaDemo/src/predicate/PredicateDemo.java
+++ b/LambdaDemo/src/predicate/PredicateDemo.java
@@ -2,6 +2,8 @@
 
 import java.util.Arrays;
 import java.util.List;
+import java.util.function.BiFunction;
+import java.util.function.BinaryOperator;
 import java.util.function.Predicate;
 
 class Helper
@@ -12,6 +14,9 @@ class Helper
 	static Predicate<Integer> isSquare = (x) -> Math.sqrt(x) * Math.sqrt(x) == x;
 }
 public class PredicateDemo {
+	
+	public static BinaryOperator<Integer> accumulator = (a,b) -> (a+b);
+	public static int INIT_SUM = 0;
 
 	public static void main(String[] args) {
 		List<Integer> scores = Arrays.asList(40, 45, 7, 105, 36, 144, 50, 6, 8, 9);
@@ -19,6 +24,8 @@ public static void main(String[] args) {
 		System.out.println("Sum of odd = "  + sumAll(scores, Helper.isOdd));
 		System.out.println("Sum of large = "  + sumAll(scores, Helper.isLarge));
 		System.out.println("Sum of squares = "  + sumAll(scores, Helper.isSquare));
+		
+		System.out.println("Sum of over 30 using streams = "  + sumAllUsingStreams(scores, Helper.isOver30, accumulator));
 
 	}
 	
@@ -34,5 +41,10 @@ public static int sumAll(List<Integer> values, Predicate<Integer> p)
 		}
 		return sum;
 	}
+	
+	public static int sumAllUsingStreams(List<Integer> values, Predicate<Integer> p, BinaryOperator<Integer> adder)
+	{
+		return values.stream().filter(p).reduce(INIT_SUM, adder);
+	}
 
 }
diff --git a/LambdaDemo/src/predicate/junit/UnitTests.java b/LambdaDemo/src/predicate/junit/UnitTests.java
new file mode 100644
index 0000000..bae9f37
--- /dev/null
+++ b/LambdaDemo/src/predicate/junit/UnitTests.java
@@ -0,0 +1,49 @@
+package predicate.junit;
+
+import static org.junit.Assert.*;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.Predicate;
+
+import org.junit.Test;
+
+import predicate.PredicateDemo;
+
+class Helper
+{
+	static Predicate<Integer> isOver30 = (x) -> x > 30;
+	static Predicate<Integer> isOdd = (x) -> x % 2 == 1;
+	static Predicate<Integer> isLarge = (x) -> x > 100;
+	static Predicate<Integer> isSquare = (x) -> Math.sqrt(x) * Math.sqrt(x) == x;
+}
+
+public class UnitTests 
+{
+	List<Integer> scores = Arrays.asList(40, 45, 7, 105, 36, 144, 50, 6, 8, 9);
+	
+	@Test
+	public void over30shouldBe420()
+	{
+		assertTrue("Sum of over 30 should be 420", PredicateDemo.sumAll(scores, Helper.isOver30) == 420);
+	}
+	
+	@Test
+	public void sumOfOdd()
+	{
+		assertTrue("Sum of odd should be 166", PredicateDemo.sumAll(scores, Helper.isOdd) == 166);
+	}
+	
+	@Test
+	public void sumOfOddUsingStreams()
+	{
+		assertTrue("Sum of odd using streams should be 166", PredicateDemo.sumAllUsingStreams(scores, Helper.isOdd, PredicateDemo.accumulator) == 166);
+	}
+	
+	@Test
+	public void sumOfSquares()
+	{
+		assertTrue("Sum of squares should be 189", PredicateDemo.sumAll(scores, Helper.isSquare) == 189);
+	}
+
+}