Fix for junit-team#499 Assumes in tests run by Theories

Fixes an issue (junit-team#499) where Assume cannot be used in a method annotated
by @test if theories also exist in that test class.

src/main/java/org/junit/experimental/theories/Theories.java

@@ -96,8 +96,10 @@ private TestClass getTestClass() {
         public void evaluate() throws Throwable {
             runWithAssignment(Assignments.allUnassigned(
                     fTestMethod.getMethod(), getTestClass()));
-
-            if (successes == 0) {
+
+            //if this test method is not annotated with Theory, then no successes is a valid case
+            boolean hasTheoryAnnotation = fTestMethod.getAnnotation(Theory.class) != null;
+            if (successes == 0 && hasTheoryAnnotation) {
                 Assert
                         .fail("Never found parameters that satisfied method assumptions.  Violated assumptions: "
                                 + fInvalidParameters);

src/test/java/org/junit/tests/experimental/theories/AssumingInTheoriesTest.java

@@ -0,0 +1,50 @@
+package org.junit.tests.experimental.theories;
+
+import org.junit.Assert;
+import org.junit.Assume;
+import org.junit.Test;
+import org.junit.experimental.theories.DataPoint;
+import org.junit.experimental.theories.Theories;
+import org.junit.experimental.theories.Theory;
+import org.junit.runner.JUnitCore;
+import org.junit.runner.Request;
+import org.junit.runner.Result;
+import org.junit.runner.RunWith;
+import org.junit.runner.Runner;
+import org.junit.runners.model.InitializationError;
+
+@RunWith(Theories.class)
+public class AssumingInTheoriesTest {
+
+	@Test
+	public void noTheoryAnnotationMeansAssumeShouldIgnore(){
+		Assume.assumeTrue(false);
+	}
+
+	@Test
+	public void theoryMeansOnlyAssumeShouldFail() throws InitializationError{
+
+		JUnitCore junitRunner = new JUnitCore();
+		Runner theoryRunner = new Theories(TheoryWithNoUnassumedParameters.class);
+		Request request = Request.runner(theoryRunner);
+		Result result = junitRunner.run(request);
+		Assert.assertEquals("A theory with no valid parameters did not fail.", 1, result.getFailureCount());
+
+	}
+
+	/**
+	 * Simple class that SHOULD fail because no parameters are met.
+	 */
+	public static class TheoryWithNoUnassumedParameters{
+
+		@DataPoint 
+		public final static boolean FALSE = false;
+
+		@Theory
+		public void theoryWithNoUnassumedParameters(boolean value)
+		{
+			Assume.assumeTrue(value);
+		}
+	}
+
+}