Public void GivenTwoNumbers_Subtract_ReturnsTheFirstNumberSubtractedFromTheSecond() Public void GivenTwoNumbers_Add_ReturnsTheTwoNumbersAddedTogether() Private readonly Calculator _calculator = new Calculator() Next, let’s add a new test class called CalculatorTests.cs, implementing the tests as we’d expect the behavior to occur: public class CalculatorTests Code coverage is generated based on the lines hit, as well as “branches”, which is if our code has statements that have if / else / switch for example, which can result in different paths of execution. There are some mentions of “branches”.This is as expected since we don’t have any tests yet. The total “lines-covered” is set to 0.This matches the 3 lines for our “Add” method, and 3 lines for our “Subtract” method Learning Web API? Get our eBook ASP.NET Core Web API Best Practices and become an expert for FREE! > GET THE BOOK How you use that data is of course up to you. Code coverage simply gives you more data about your code, which you can use to make decisions that work for you and your team. We’re not going to debate that here, as it’s a subjective topic not meant for this blog. Some might argue it’s more valuable to have less coverage but with the right tests. Because it simply checks which lines of code are crossed by tests and not actually the value of the tests themselves, you could get great coverage by writing bad tests. One caveat and often a hotly debated topic about code coverage is how ‘valuable’ these metrics are. These metrics are usually discovered by code analysis tools that run through our source code lines, and cross-reference them against the tests that hit these various code paths. What Is Code Coverage?Ĭode coverage is a metric that we can use to understand how well our code is covered by tests. Theory on Code Coverageīefore we jump into the technical details, it’s worth spending a moment understanding the theory behind code coverage and why it’s important in software development. Let’s jump right into some basic theory on code coverage. To download the source code for this article, you can visit our Code Coverage in.
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