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

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/*
 * Copyright 2019 TNG Technology Consulting GmbH
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
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));
        }
    }
}