Tests

Added test of two budgets recharging #71

Job	Run time
test (stable, ubuntu-latest)	43s
test (stable, windows-latest)	4m 34s
test (stable, macos-latest)	48s
test (stable, --all-features, ubuntu-latest)	3m 32s
test (stable, --all-features, windows-latest)	9m 59s
test (stable, --all-features, macos-latest)	2m 55s
test (1.79.0, ubuntu-latest)	38s
test (1.79.0, windows-latest)	1m 5s
test (1.79.0, macos-latest)	42s
test (1.79.0, --all-features, ubuntu-latest)	3m 6s
test (1.79.0, --all-features, windows-latest)	5m 17s
test (1.79.0, --all-features, macos-latest)	2m 17s
	35m 36s

Provide feedback