代码

@NoArgsConstructor(access = AccessLevel.PRIVATE)
public final class Assert {
    public static void greaterThan(double num, double exp, String msg) {
        if (num < exp) {
            throw new IllegalArgumentException(msg);
        }
    }
    public static void notNull(Object object, String msg) {
        if (null == object) {
            throw new IllegalArgumentException(msg);
        }
    }
    public static void notEmpty(String str, String msg) {
        if (null == str || "".equals(str)) {
            throw new IllegalArgumentException(msg);
        }
    }
    public static <T> void notEmpty(T[] arr, String msg) {
        if (null == arr || arr.length == 0) {
            throw new IllegalArgumentException(msg);
        }
    }
    public static <T> T wrap(Callable<T> callable) {
        try {
            return callable.call();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
    public static void packageNotEmpty(Class<?> clazz,String msg){
        if (clazz.getPackage() == null) {
            throw new IllegalArgumentException("[" + clazz.getName() + ".java] " + msg);
        }
    }
}

测试

import org.junit.Test;
public class AssertTest {
    @Test(expected = IllegalArgumentException.class)
    public void testNotEmpty() {
        Assert.notEmpty("", "Not Empty");
        Assert.notEmpty(new String[]{}, "Arr Empty");
        Assert.notNull(null, "Not null");
    }
    @Test(expected = RuntimeException.class)
    public void testWrap() {
        Assert.wrap(() -> {
            int a = 1 / 0;
            return true;
        });
    }
    @Test
    public void testWrap2() {
        boolean flag = Assert.wrap(() -> true);
        org.junit.Assert.assertEquals(true, flag);
    }
}