A deterministic test case with hard-coded seeded random number generator.
org.apache.commons.math3.linear.BlockFieldMatrixTest
@Test
public void testCopyFunctions() {
Random r = new Random(66636328996002l);
BlockFieldMatrix<Fraction> m1 = createRandomMatrix(r, 47, 83);
BlockFieldMatrix<Fraction> m2 = new BlockFieldMatrix<Fraction>(m1.getData());
Assert.assertEquals(m1, m2);
BlockFieldMatrix<Fraction> m3 = new BlockFieldMatrix<Fraction>(testData);
BlockFieldMatrix<Fraction> m4 = new BlockFieldMatrix<Fraction>(m3.getData());
Assert.assertEquals(m3, m4);
}