assertEquals("a3", matrixParameters.get("a").get(2));
assertEquals("a4", matrixParameters.get("a").get(3));
assertEquals(1, matrixParameters.get("c").size());
assertEquals("c1", matrixParameters.get("c").get(0));
segment.clearMatrixParameter("c");
assertEquals(2, matrixParameters.size());
assertNull(matrixParameters.get("c"));
segment.clearAllMatrixParameters();
assertEquals(0, matrixParameters.size());