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A client library for Unleash
There is a newer version: 9.2.4
package io.getunleash;

import static java.util.Collections.emptyList;

import io.getunleash.lang.Nullable;
import java.util.*;
import java.util.function.BiPredicate;
import java.util.stream.Collectors;

public class FakeUnleash implements Unleash {
    private boolean enableAll = false;
    private boolean disableAll = false;
    private Map excludedFeatures = new HashMap<>();
    private Map features = new HashMap<>();
    private Map variants = new HashMap<>();

    @Override
    public boolean isEnabled(String toggleName, boolean defaultSetting) {
        if (enableAll) {
            return excludedFeatures.getOrDefault(toggleName, true);
        } else if (disableAll) {
            return excludedFeatures.getOrDefault(toggleName, false);
        } else {
            return more().getFeatureToggleDefinition(toggleName)
                    .map(FeatureToggle::isEnabled)
                    .orElse(defaultSetting);
        }
    }

    @Override
    public boolean isEnabled(
            String toggleName,
            UnleashContext context,
            BiPredicate fallbackAction) {
        return isEnabled(toggleName, fallbackAction);
    }

    @Override
    public boolean isEnabled(
            String toggleName, BiPredicate fallbackAction) {
        if (!features.containsKey(toggleName)) {
            return fallbackAction.test(toggleName, UnleashContext.builder().build());
        }
        return isEnabled(toggleName);
    }

    @Override
    public Variant getVariant(String toggleName, UnleashContext context) {
        return getVariant(toggleName, Variant.DISABLED_VARIANT);
    }

    @Override
    public Variant getVariant(String toggleName, UnleashContext context, Variant defaultValue) {
        return getVariant(toggleName, defaultValue);
    }

    @Override
    public Variant getVariant(String toggleName) {
        return getVariant(toggleName, Variant.DISABLED_VARIANT);
    }

    @Override
    public Variant getVariant(String toggleName, Variant defaultValue) {
        if (isEnabled(toggleName) && variants.containsKey(toggleName)) {
            return variants.get(toggleName);
        } else {
            return defaultValue;
        }
    }

    @Override
    public List getFeatureToggleNames() {
        return more().getFeatureToggleNames();
    }

    @Override
    public MoreOperations more() {
        return new FakeMore();
    }

    public void enableAll() {
        disableAll = false;
        enableAll = true;
        excludedFeatures.clear();
        features.clear();
    }

    public void enableAllExcept(String... excludedFeatures) {
        enableAll();
        for (String toggle : excludedFeatures) {
            this.excludedFeatures.put(toggle, false);
        }
    }

    public void disableAll() {
        disableAll = true;
        enableAll = false;
        excludedFeatures.clear();
        features.clear();
    }

    public void disableAllExcept(String... excludedFeatures) {
        disableAll();
        for (String toggle : excludedFeatures) {
            this.excludedFeatures.put(toggle, true);
        }
    }

    public void resetAll() {
        disableAll = false;
        enableAll = false;
        excludedFeatures.clear();
        features.clear();
        variants.clear();
    }

    public void enable(String... features) {
        for (String name : features) {
            this.features.put(name, new FeatureToggle(name, true, emptyList()));
        }
    }

    public void disable(String... features) {
        for (String name : features) {
            this.features.put(name, new FeatureToggle(name, false, emptyList()));
        }
    }

    public void reset(String... features) {
        for (String name : features) {
            this.features.remove(name);
        }
    }

    public void setVariant(String t1, Variant a) {
        variants.put(t1, a);
    }

    public class FakeMore implements MoreOperations {

        @Override
        public List getFeatureToggleNames() {
            return new ArrayList<>(features.keySet());
        }

        @Override
        public Optional getFeatureToggleDefinition(String toggleName) {
            return Optional.ofNullable(features.get(toggleName));
        }

        @Override
        public List evaluateAllToggles() {
            return evaluateAllToggles(null);
        }

        @Override
        public List evaluateAllToggles(@Nullable UnleashContext context) {
            return getFeatureToggleNames().stream()
                    .map(
                            toggleName ->
                                    new EvaluatedToggle(
                                            toggleName,
                                            isEnabled(toggleName),
                                            getVariant(toggleName)))
                    .collect(Collectors.toList());
        }

        @Override
        public void count(String toggleName, boolean enabled) {
            // Nothing to count
        }

        @Override
        public void countVariant(String toggleName, String variantName) {
            // Nothing to count
        }
    }
}