The CMHC regularly undertakes stress tests. They publish those stress tests—or they have published those stress tests—in their annual report. The annual report provides the parameters for the stress tests.
There are varying degrees of stress, from what you might think of moderate—for example, a 10% reduction in house prices—to something that's really quite exceptional, such as the last episode in the United States. For a more moderate event like a 10% decline in house prices uniformly across the country, CMHC estimates that its net loss in income in total, cumulatively over a six-year period, would be $2.5 billion.