Actual energy consumption will vary a lot depending on factors such as the age and efficiency of the product, how you're using it (for example, how warm your showers are, or how fast you drive), weather and climate conditions (which is particularly important for the energy usage of heaters and air conditioners).
Yet in practice, it sometimes turns out that a setup of some complex scenarios, especially corner cases, takes too much effort/code. Or there are algorithms that, for the time being, are used only with limited parameters, but we should exercise the whole implementation in tests. There might be a similar situation with complex Value Objects. In such cases it’s worthwhile to go one level below Sociable Unit Tests and create a suite of Overlapping Unit Tests.
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It is thought to have been made in the Derby porcelain factory around 1770-1800.
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