Package org.junit.experimental.theories

Class ParameterSupplier

  • Direct Known Subclasses:
    TestedOnSupplier
    public abstract class ParameterSupplier
extends java.lang.Object
    Abstract parent class for suppliers of input data points for theories. Extend this class to customize how Theories runner finds accepted data points. Then use your class together with @ParametersSuppliedBy on input parameters for theories.

    For example, here is a supplier for values between two integers, and an annotation that references it: 

         @Retention(RetentionPolicy.RUNTIME)
     @ParametersSuppliedBy(BetweenSupplier.class)
     public @interface Between {
         int first();

         int last();
     }

     public static class BetweenSupplier extends ParameterSupplier {
         @Override
         public List<PotentialAssignment> getValueSources(ParameterSignature sig) {
             List<PotentialAssignment> list = new ArrayList<PotentialAssignment>();
             Between annotation = (Between) sig.getSupplierAnnotation();

             for (int i = annotation.first(); i <= annotation.last(); i++)
                 list.add(PotentialAssignment.forValue("ints", i));
             return list;
         }
     }

    See Also:
    ParametersSuppliedBy, Theories, FromDataPoints