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The common core for a TestNG like dataprovider runner for JUnit.

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package com.tngtech.junit.dataprovider;

public class Preconditions {

    public static  T checkNotNull(T object, String errorMessage) {
        if (object == null) {
            throw new NullPointerException(errorMessage);
        }
        return object;
    }

    public static void checkArgument(boolean expression, String errorMessage) {
        if (!expression) {
            throw new IllegalArgumentException(errorMessage);
        }
    }

    public static void checkArgument(boolean expression, String errorMessageFormat, Object... errorMessageArgs) {
        if (!expression) {
            throw new IllegalArgumentException(String.format(errorMessageFormat, errorMessageArgs));
        }
    }

    public static void checkState(boolean expression, String errorMessage) {
        if (!expression) {
            throw new IllegalStateException(errorMessage);
        }
    }

    public static void checkState(boolean expression, String errorMessageFormat, Object... errorMessageArgs) {
        if (!expression) {
            throw new IllegalStateException(String.format(errorMessageFormat, errorMessageArgs));
        }
    }
}