Description

All Manager ViewModels cast Application.Current to App in their constructors or tick handlers to read configuration:

var app = (App)Application.Current;
_maxLines = app.ConsoleMaxLines;
_refreshInterval = app.RefreshIntervalInSeconds;

Affected files:

• MainViewModel.cs (lines 364, 450, 528, 546, 854)
• ConsoleViewModel.cs (lines 222, 366, 518)
• PerformanceViewModel.cs (lines 181, 431)
• DependenciesViewModel.cs (lines 205, 355)

This makes it impossible to instantiate these ViewModels in a unit test without a running WPF Application.

Suggested fix

Extract configuration into an injectable IAppConfiguration interface:

public interface IAppConfiguration
{
    int ConsoleMaxLines { get; }
    int RefreshIntervalInSeconds { get; }
    // ...
}

Inject it via constructor instead of accessing Application.Current.