def METHOD_NAME():
    m = pyo.ConcreteModel()
    m.fs = idaes.core.FlowsheetBlock(dynamic=False)
    m.fs.properties = iapws95.Iapws95ParameterBlock()
    m.fs.unit = HelmMixer(
        momentum_mixing_type=MomentumMixingType.equality,
        property_package=m.fs.properties,
        inlet_list=["i1", "i2", "i3"],
    )
    Fin1 = 1.1e4  # mol/s
    hin1 = 4000  # J/mol
    Pin1 = 1.2e5  # Pa
    Fin2 = 1e4  # mol/s
    hin2 = 5000  # J/mol
    Pin2 = 2e5  # Pa
    Fin3 = 1.3e4  # mol/s
    hin3 = 6000  # J/mol
    Pin3 = 3e5  # Pa
    Pout = 1.5e5  # Pa
    m.fs.unit.i1.flow_mol[0].fix(Fin1)
    m.fs.unit.i1.enth_mol[0].fix(hin1)
    m.fs.unit.i1.pressure[0] = Pin1
    m.fs.unit.i2.flow_mol[0].fix(Fin2)
    m.fs.unit.i2.enth_mol[0].fix(hin2)
    m.fs.unit.i2.pressure[0] = Pin2
    m.fs.unit.i3.flow_mol[0].fix(Fin3)
    m.fs.unit.i3.enth_mol[0].fix(hin3)
    m.fs.unit.i3.pressure[0] = Pin3
    m.fs.unit.outlet.pressure[0].fix(Pout)
    m.fs.unit.initialize()
    Fout = Fin1 + Fin2 + Fin3
    hout = (hin1 * Fin1 + hin2 * Fin2 + hin3 * Fin3) / Fout
    assert pyo.value(m.fs.unit.outlet.flow_mol[0]) == pytest.approx(Fout, rel=1e-7)
    assert pyo.value(m.fs.unit.outlet.enth_mol[0]) == pytest.approx(hout, rel=1e-7)
    assert pyo.value(m.fs.unit.outlet.pressure[0]) == pytest.approx(Pout, rel=1e-7)
    assert pyo.value(m.fs.unit.i1.pressure[0]) == pytest.approx(Pout, rel=1e-7)
    assert pyo.value(m.fs.unit.i2.pressure[0]) == pytest.approx(Pout, rel=1e-7)
    assert pyo.value(m.fs.unit.i3.pressure[0]) == pytest.approx(Pout, rel=1e-7)