Fixes #449, stopping AllMembersSupplier & Theories hiding DataPoints method exceptions

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

@@ -52,4 +52,5 @@
 @Target({FIELD, METHOD})
 public @interface DataPoint {
     String[] value() default {};
-}
+    Class<? extends Throwable>[] ignoredExceptions() default {};
+}

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

@@ -51,4 +51,5 @@
 @Target({FIELD, METHOD})
 public @interface DataPoints {
     String[] value() default {};
+    Class<? extends Throwable>[] ignoredExceptions() default {};
 }

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

@@ -3,5 +3,5 @@
 import java.util.List;
 
 public abstract class ParameterSupplier {
-    public abstract List<PotentialAssignment> getValueSources(ParameterSignature sig);
+    public abstract List<PotentialAssignment> getValueSources(ParameterSignature sig) throws Throwable;
 }

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

@@ -5,6 +5,13 @@
 public abstract class PotentialAssignment {
     public static class CouldNotGenerateValueException extends Exception {
         private static final long serialVersionUID = 1L;
+
+        public CouldNotGenerateValueException() {
+        }
+
+        public CouldNotGenerateValueException(Throwable t) {
+            super(t);
+        }
     }
 
     public static PotentialAssignment forValue(final String name, final Object value) {

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

@@ -9,7 +9,7 @@
 import java.util.List;
 
 import org.junit.Assert;
-import org.junit.experimental.theories.PotentialAssignment.CouldNotGenerateValueException;
+import org.junit.Assume;
 import org.junit.experimental.theories.internal.Assignments;
 import org.junit.experimental.theories.internal.ParameterizedAssertionError;
 import org.junit.internal.AssumptionViolatedException;
@@ -202,8 +202,13 @@ protected Statement methodInvoker(FrameworkMethod method, Object test) {
 
                 @Override
                 public Object createTest() throws Exception {
-                    return getTestClass().getOnlyConstructor().newInstance(
-                            complete.getConstructorArguments(nullsOk()));
+                    Object[] params = complete.getConstructorArguments();
+
+                    if (!nullsOk()) {
+                        Assume.assumeNotNull(params);
+                    }
+
+                    return getTestClass().getOnlyConstructor().newInstance(params);
                 }
             }.methodBlock(fTestMethod).evaluate();
         }
@@ -213,13 +218,13 @@ private Statement methodCompletesWithParameters(
             return new Statement() {
                 @Override
                 public void evaluate() throws Throwable {
-                    try {
-                        final Object[] values = complete.getMethodArguments(
-                                nullsOk());
-                        method.invokeExplosively(freshInstance, values);
-                    } catch (CouldNotGenerateValueException e) {
-                        // ignore
+                    final Object[] values = complete.getMethodArguments();
+
+                    if (!nullsOk()) {
+                        Assume.assumeNotNull(values);
                     }
+
+                    method.invokeExplosively(freshInstance, values);
                 }
             };
         }

src/main/java/org/junit/experimental/theories/internal/AllMembersSupplier.java

@@ -1,11 +1,15 @@
 package org.junit.experimental.theories.internal;
 
+import static org.hamcrest.CoreMatchers.not;
+import static org.hamcrest.core.IsInstanceOf.instanceOf;
+
 import java.lang.reflect.Array;
 import java.lang.reflect.Field;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 
+import org.junit.Assume;
 import org.junit.experimental.theories.DataPoint;
 import org.junit.experimental.theories.DataPoints;
 import org.junit.experimental.theories.ParameterSignature;
@@ -36,17 +40,24 @@ public Object getValue() throws CouldNotGenerateValueException {
             } catch (IllegalAccessException e) {
                 throw new RuntimeException(
                         "unexpected: getMethods returned an inaccessible method");
-            } catch (Throwable e) {
-                throw new CouldNotGenerateValueException();
-                // do nothing, just look for more values
+            } catch (Throwable t) {
+                DataPoint annotation = fMethod.getAnnotation(DataPoint.class); 
+                if (annotation != null) {
+                    for (Class<? extends Throwable> ignorable : annotation.ignoredExceptions()) {
+                        Assume.assumeThat(t, not(instanceOf(ignorable)));
+                    }
+                }
+
+                throw new CouldNotGenerateValueException(t);
             }
-        }    
-    
+        }
+
         @Override
         public String getDescription() throws CouldNotGenerateValueException {
             return fMethod.getName();
         }
-    }           
+    }   
+
     private final TestClass fClass;
 
     /**
@@ -57,7 +68,7 @@ public AllMembersSupplier(TestClass type) {
     }
 
     @Override
-    public List<PotentialAssignment> getValueSources(ParameterSignature sig) {
+    public List<PotentialAssignment> getValueSources(ParameterSignature sig) throws Throwable {
         List<PotentialAssignment> list = new ArrayList<PotentialAssignment>();
 
         addSinglePointFields(sig, list);
@@ -68,15 +79,23 @@ public List<PotentialAssignment> getValueSources(ParameterSignature sig) {
         return list;
     }
 
-    private void addMultiPointMethods(ParameterSignature sig, List<PotentialAssignment> list) {
+    private void addMultiPointMethods(ParameterSignature sig, List<PotentialAssignment> list) throws Throwable {
         for (FrameworkMethod dataPointsMethod : getDataPointsMethods(sig)) {
             Class<?> returnType = dataPointsMethod.getReturnType();
 
             if (returnType.isArray() && sig.canPotentiallyAcceptType(returnType.getComponentType())) {
                 try {
                     addArrayValues(sig, dataPointsMethod.getName(), list, dataPointsMethod.invokeExplosively(null));
-                } catch (Throwable e) {
-                    // ignore and move on
+                } catch (Throwable t) {
+                    DataPoints annotation = dataPointsMethod.getAnnotation(DataPoints.class);
+                    if (annotation != null) {
+                        for (Class<? extends Throwable> ignored : annotation.ignoredExceptions()) {
+                            if (ignored.isAssignableFrom(t.getClass())) {
+                                return;
+                            }
+                        }
+                    }
+                    throw t;
                 }
             }
         }
@@ -94,7 +113,7 @@ private void addMultiPointFields(ParameterSignature sig, List<PotentialAssignmen
         for (final Field field : getDataPointsFields(sig)) {
             addArrayValues(sig, field.getName(), list, getStaticFieldValue(field));
         }
-    }
+    }    
 
     private void addSinglePointFields(ParameterSignature sig, List<PotentialAssignment> list) {
         for (final Field field : getSingleDataPointFields(sig)) {

src/main/java/org/junit/experimental/theories/internal/Assignments.java

@@ -63,21 +63,17 @@ public Assignments assignNext(PotentialAssignment source) {
                 fUnassigned.size()), fClass);
     }
 
-    public Object[] getActualValues(int start, int stop, boolean nullsOk)
+    public Object[] getActualValues(int start, int stop) 
             throws CouldNotGenerateValueException {
         Object[] values = new Object[stop - start];
         for (int i = start; i < stop; i++) {
-            Object value = fAssigned.get(i).getValue();
-            if (value == null && !nullsOk) {
-                throw new CouldNotGenerateValueException();
-            }
-            values[i - start] = value;
+            values[i - start] = fAssigned.get(i).getValue();
         }
         return values;
     }
 
     public List<PotentialAssignment> potentialsForNextUnassigned()
-            throws Exception {
+            throws Throwable {
         ParameterSignature unassigned = nextUnassigned();
         List<PotentialAssignment> assignments = getSupplier(unassigned).getValueSources(unassigned);
 
@@ -127,20 +123,17 @@ private ParameterSupplier buildParameterSupplierFromClass(
         return cls.newInstance();
     }
 
-    public Object[] getConstructorArguments(boolean nullsOk)
+    public Object[] getConstructorArguments()
             throws CouldNotGenerateValueException {
-        return getActualValues(0, getConstructorParameterCount(), nullsOk);
+        return getActualValues(0, getConstructorParameterCount());
     }
 
-    public Object[] getMethodArguments(boolean nullsOk)
-            throws CouldNotGenerateValueException {
-        return getActualValues(getConstructorParameterCount(),
-                fAssigned.size(), nullsOk);
+    public Object[] getMethodArguments() throws CouldNotGenerateValueException {
+        return getActualValues(getConstructorParameterCount(), fAssigned.size());
     }
 
-    public Object[] getAllArguments(boolean nullsOk)
-            throws CouldNotGenerateValueException {
-        return getActualValues(0, fAssigned.size(), nullsOk);
+    public Object[] getAllArguments() throws CouldNotGenerateValueException {
+        return getActualValues(0, fAssigned.size());
     }
 
     private int getConstructorParameterCount() {

src/main/java/org/junit/experimental/theories/internal/SpecificDataPointsSupplier.java

@@ -33,7 +33,7 @@ protected Collection<Field> getSingleDataPointFields(ParameterSignature sig) {
             }
         }
 
-        return fieldsWithMatchingNames;        
+        return fieldsWithMatchingNames;
     }
 
     @Override

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

@@ -18,7 +18,7 @@ public final class TheoryTestUtils {
     private TheoryTestUtils() { }
 
     public static List<PotentialAssignment> potentialAssignments(Method method)
-            throws Exception {
+            throws Throwable {
         return Assignments.allUnassigned(method,
                 new TestClass(method.getDeclaringClass()))
                 .potentialsForNextUnassigned();

src/test/java/org/junit/tests/experimental/theories/extendingwithstubs/StubbedTheories.java

@@ -50,7 +50,7 @@ protected void runWithIncompleteAssignment(Assignments incomplete)
         }
 
         private GuesserQueue createGuesserQueue(Assignments incomplete)
-                throws Exception {
+                throws Throwable {
             ParameterSignature nextUnassigned = incomplete.nextUnassigned();
 
             if (nextUnassigned.hasAnnotation(Stub.class)) {

src/test/java/org/junit/tests/experimental/theories/internal/AllMembersSupplierTest.java

@@ -8,16 +8,21 @@
 
 import java.util.List;
 
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.experimental.theories.DataPoint;
 import org.junit.experimental.theories.DataPoints;
 import org.junit.experimental.theories.ParameterSignature;
 import org.junit.experimental.theories.PotentialAssignment;
 import org.junit.experimental.theories.Theory;
 import org.junit.experimental.theories.internal.AllMembersSupplier;
+import org.junit.rules.ExpectedException;
 import org.junit.runners.model.TestClass;
 
 public class AllMembersSupplierTest {
+    @Rule
+    public ExpectedException expected = ExpectedException.none();
+
 
     public static class HasDataPointsArrayField {
         @DataPoints
@@ -29,7 +34,7 @@ public void theory(String param) {
     }
 
     @Test
-    public void dataPointsArrayShouldBeRecognized() throws Exception {
+    public void dataPointsArrayShouldBeRecognized() throws Throwable {
         List<PotentialAssignment> assignments = potentialAssignments(
                 HasDataPointsArrayField.class.getMethod("theory", String.class));
 
@@ -46,7 +51,7 @@ public void theory(Integer param) {
     }
 
     @Test
-    public void dataPointsArrayShouldBeRecognizedOnValueTypeNotFieldType() throws Exception {
+    public void dataPointsArrayShouldBeRecognizedOnValueTypeNotFieldType() throws Throwable {
         List<PotentialAssignment> assignments = potentialAssignments(
                 HasDataPointsArrayWithMatchingButInaccurateTypes.class.getMethod("theory", Integer.class));
 
@@ -65,7 +70,7 @@ public void theory(Object param) {
     }
 
     @Test
-    public void dataPointMethodShouldBeRecognizedForOverlyGeneralParameters() throws Exception {
+    public void dataPointMethodShouldBeRecognizedForOverlyGeneralParameters() throws Throwable {
         List<PotentialAssignment> assignments = potentialAssignments(
                 HasDataPointMethodWithOverlyGeneralTypes.class.getMethod("theory", Object.class));
 
@@ -82,7 +87,7 @@ public void theory(Object obj) {
     }
 
     @Test
-    public void dataPointsAnnotationMeansTreatAsArrayOnly() throws Exception {
+    public void dataPointsAnnotationMeansTreatAsArrayOnly() throws Throwable {
         List<PotentialAssignment> assignments = potentialAssignments(
                 HasDataPointsWithObjectParameter.class.getMethod("theory", Object.class));
 
@@ -101,13 +106,9 @@ public HasDataPointsFieldWithNullValue(Object obj) {
     }
 
     @Test
-    public void dataPointsArrayFieldMayContainNullValue()
-            throws SecurityException, NoSuchMethodException {
-        List<PotentialAssignment> valueSources = new AllMembersSupplier(
-                new TestClass(HasDataPointsFieldWithNullValue.class))
-                .getValueSources(ParameterSignature.signatures(
-                        HasDataPointsFieldWithNullValue.class.getConstructor(Object.class))
-                        .get(0));
+    public void dataPointsArrayFieldMayContainNullValue() throws Throwable {
+        List<PotentialAssignment> valueSources = allMemberValuesFor(
+                HasDataPointsFieldWithNullValue.class, Object.class);
         assertThat(valueSources.size(), is(2));
     }
 
@@ -122,13 +123,34 @@ public HasDataPointsMethodWithNullValue(Integer i) {
     }
 
     @Test
-    public void dataPointsArrayMethodMayContainNullValue()
-            throws SecurityException, NoSuchMethodException {
-        List<PotentialAssignment> valueSources = new AllMembersSupplier(
-                new TestClass(HasDataPointsMethodWithNullValue.class))
+    public void dataPointsArrayMethodMayContainNullValue() throws Throwable {
+        List<PotentialAssignment> valueSources = allMemberValuesFor(
+                HasDataPointsMethodWithNullValue.class, Integer.class);
+        assertThat(valueSources.size(), is(2));
+    }
+
+    public static class HasFailingDataPointsArrayMethod {
+        @DataPoints
+        public static Object[] objects() {
+            throw new RuntimeException("failing method");
+        }
+
+        public HasFailingDataPointsArrayMethod(Object obj) {
+        }
+    }
+
+    @Test
+    public void allMembersFailsOnFailingDataPointsArrayMethod() throws Throwable {
+        expected.expect(RuntimeException.class);
+        expected.expectMessage("failing method");
+        allMemberValuesFor(HasFailingDataPointsArrayMethod.class, Object.class);
+    }
+
+    private List<PotentialAssignment> allMemberValuesFor(Class<?> testClass,
+            Class<?>... constructorParameterTypes) throws Throwable {
+        return new AllMembersSupplier(new TestClass(testClass))
                 .getValueSources(ParameterSignature.signatures(
-                        HasDataPointsMethodWithNullValue.class.getConstructor(Integer.class))
+                        testClass.getConstructor(constructorParameterTypes))
                         .get(0));
-        assertThat(valueSources.size(), is(2));
     }
 }