java – JUnit测试理论失败的假设

import org.junit.BeforeClass;
import org.junit.runner.RunWith;
import org.junit.experimental.theories.DataPoints;
import org.junit.experimental.theories.Theories;
import org.junit.experimental.theories.Theory;

@RunWith(Theories.class)
public class MyTest {

static double[][][] arrayData;

@BeforeClass
public static void setUpBeforeClass() throws Exception {
    double[] date_1 = {1,2,3};
    double[] expect_1 = {2,4,6};

    double[] date_2 = {10,20,30};
    double[] expect_2 = {20,40,60};

    arrayData = new double[][][] {
        {date_1,expect_1},{date_2,expect_2}
    };

    return;
}

@DataPoints
public static double[][][] getData() {
    return arrayData;
}

@Theory
public void doTest(double[] data,double[] expect) {
    // do some testing
    return;
}

}

每当我运行它时,测试在调用doTest()之前就会失败.错误消息是：

java.lang.AssertionError: Never found parameters that satisfied method
assumptions. Violated assumptions: [ ]

我没有定义任何假设,根据这个oracle example,没有必要定义一个假设.

我错过了什么？