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JavaFixture is the attempt to bring Mark Seemann's AutoFixture for .NET to the Java world. Its purpose is to generate full object graphs for use in test suites with a fluent API for customising the test objects during generation.

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package com.github.nylle.javafixture.specimen;

import com.github.nylle.javafixture.Context;
import com.github.nylle.javafixture.CustomizationContext;
import com.github.nylle.javafixture.ISpecimen;
import com.github.nylle.javafixture.InstanceFactory;
import com.github.nylle.javafixture.SpecimenFactory;
import com.github.nylle.javafixture.SpecimenType;

import static com.github.nylle.javafixture.CustomizationContext.noContext;

public class InterfaceSpecimen implements ISpecimen {

    private final SpecimenType type;
    private final Context context;
    private final InstanceFactory instanceFactory;

    public InterfaceSpecimen(final SpecimenType type, final Context context, final SpecimenFactory specimenFactory) {

        if (type == null) {
            throw new IllegalArgumentException("type: null");
        }

        if (context == null) {
            throw new IllegalArgumentException("context: null");
        }

        if (specimenFactory == null) {
            throw new IllegalArgumentException("specimenFactory: null");
        }

        if (!type.isAbstract() || type.isMap() || type.isCollection()) {
            throw new IllegalArgumentException("type: " + type.getName());
        }

        this.type = type;
        this.context = context;
        this.instanceFactory = new InstanceFactory(specimenFactory);
    }

    @Override
    public T create() {
        return create(noContext());
    }

    @Override
    public T create(final CustomizationContext customizationContext) {
        if (context.isCached(type)) {
            return (T) context.cached(type);
        }

        return (T) context.cached(type, instanceFactory.proxy(type));
    }
}