Summary

Implemented a mandatory initialization check in Simulator.run_for() to explicitly validate that the simulator has been set up before execution.

Motive

The run_for method previously contained a #fixme comment noting the need for an initialization check. Without this check, attempting to run the simulator without a model lead to error

Nonetype has no attribute 'time'

Implementation

Replaced the placeholder comment with a conditional check.

if self.model is None:
    raise RuntimeError(
        "Simulator not set up. Call simulator.setup(model) first."
    )

Usage Examples

This change ensures that improper usage is caught immediately:

• Forgot to call sim.setup(model)

try:
    sim.run_for(10)
except RuntimeError as e:
    print(e) 
    # Output: Simulator not set up. Call simulator.setup(model) first.