### Question:
LibraKeyFactory { public Master getMaster() { return master; } LibraKeyFactory(Seed seed); Master getMaster(); ExtendedPrivKey privateChild(ChildNumber childNumber);  }### Answer:
@Test public void fromSeed() { Mnemonic mnemonic = Mnemonic.fromString(TEST_MNEMONIC); Seed seed = new Seed(mnemonic, "LIBRA"); assertEquals( "8d8d9b85e36b2b9486becd31288e9dc2501cf77f95deb7d141eeb49d77f8a80f", Hex.toHexString(seed.getData())); LibraKeyFactory libraKeyFactory = new LibraKeyFactory(seed); assertEquals( "16274c9618ed59177ca948529c1884ba65c57984d562ec2b4e5aa1ee3e3903be", Hex.toHexString(libraKeyFactory.getMaster().getData())); }