@Test
public void testExec() {

    NodeValue v1 = NodeValue.makeDouble(0);
    NodeValue v2 = NodeValue.makeDouble(0);
    NodeValue v3 = NodeValue.makeDouble(0);
    NodeValue v4 = NodeValue.makeDouble(10);
    AzimuthFF instance = new AzimuthFF();
    NodeValue expResult = NodeValue.makeDouble(1.5707963267948966);
    NodeValue result = instance.exec(v1, v2, v3, v4);
    assertEquals(expResult, result);
}