With this test model the following properties are tested:
Defining an FMU with incomplete initialization (so this FMU can only be simulated
if additional initialization conditions are defined in the environment where the FMU
is imported).
In the environment two instances are defined: The first instance is defined
with a fixed state and the second instance is defined in steady-state.
This FMU leads to a nonlinear algebraic equation over the FMU during initialization.