Visual Studio Code Coverage 2022
Aleck Coulombe
To determine what proportion of your project's code is being tested by coded tests such as unit tests, you can use the code coverage feature of Visual Studio. To effectively guard against bugs, your tests should exercise or 'cover' a large proportion of your code.
Code coverage analysis is possible for both managed (CLR) and unmanaged (native) code. Both static and dynamic instrumentation are supported. To use code coverage in command-line scenarios, use either vstest.console.exe or Microsoft.CodeCoverage.Console tool, which is an extension for dotnet-coverage that also supports native code.
Code coverage option is available under the Test menu when you run test methods using Test Explorer. The results table shows the percentage of the code executed in each assembly, class, and procedure. The source editor highlights the tested code. You can export the results in popular formats such as Cobertura.
After the tests have run, to see which lines have been run, choose Show Code Coverage Coloring in the Code Coverage Results window. By default, code that is covered by tests is highlighted in light blue.
If the results show low coverage, investigate which parts of the code aren't being exercised, and write more tests to cover them. Development teams typically aim for about 80% code coverage. In some situations, lower coverage is acceptable. For example, lower coverage is acceptable where some code is generated from a standard template.
Starting in Visual Studio 2022 Update 2, you can enable faster code coverage test results by selecting Tools > Options > Environment > Preview Features, then selecting Code coverage experience improvements, and then restarting Visual Studio.
Code coverage is counted in blocks. Block is a part of code with exactly one entry and exit point. If the program's control flow passes through a block during a test run, that block is counted as covered. The number of times the block is used doesn't affect the result.
You can also have the results displayed for lines by choosing Add/Remove Columns in the table header. Some users prefer a count of lines because the percentages correspond more closely to the size of the fragments that you see in the source code. A long block of calculation would count as a single block even if it occupies many lines.
A line of code can contain more than one code block. If this is the case, and the test run exercises all the code blocks in the line, it is counted as one line. If some but not all code blocks in the line are exercised, it is counted as a partial line.
The Code Coverage Results window usually shows the result for the entire solution. The results can be filtered to show the results for only the files that have been updated in the current branch.
To make results readable as text, choose Export Code Coverage Results. This generates a readable .coveragexml file, which you could process with other tools or send easily in mail. You can also select export formats such as Cobertura.
To send results to someone else, send either a .coverage file or an exported .coveragexml file. They can then import the file. If they have the same version of the source code, they can see coverage coloring.
For example, suppose that when you run a test with input "2", you find that 50% of a particular function is covered. When you run the test a second time with the input "-2", you see in the coverage coloring view that the other 50% of the function is covered. Now you merge the results from the two test runs, and the report and coverage coloring view shows that 100% of the function was covered.
If you merge coverage data from different versions of the code, the results are shown separately, but they aren't combined. To get fully combined results, use the same build of the code, changing only the test data.
If you merge results from tests of an ASP.NET project, the results for the separate tests are displayed, but not combined. This behavior applies only to the ASP.NET artifacts themselves: results for any other assemblies will be combined.
You might want to exclude specific elements in your code from the coverage scores, for example if the code is generated from a text template. Add the System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverageAttribute attribute to any of the following code elements: class, struct, method, property, property setter or getter, event.
Code coverage analysis is performed only on assemblies that are loaded and for which a .pdb file is available in the same directory as the .dll or .exe file. Therefore in some circumstances, you can extend the set of assemblies that is included by getting copies of the appropriate .pdb files.
You can exercise more control over which assemblies and elements are selected for code coverage analysis by writing a .runsettings file. For example, you can exclude assemblies of particular kinds without having to add attributes to their classes. For more information, see Customize code coverage analysis.
When you check in your code, your tests run on the build server along with tests from other team members. It's useful to analyze code coverage in Azure Pipelines to get the most up-to-date and comprehensive picture of coverage in the whole project. Code coverage in Azure Pipelines also includes automated system tests and other coded tests that you don't usually run on the development machines.
For Developer PowerShell, the starting directory of the shell is the Visual Studio Project Location. Replace MyTestAssembly.dll with path and test file name. For more information, see VSTest.Console.exe command-line options.
By using code coverage, you can find out where your testing needs improvement and make your software more robust and dependable. In this post, we will introduce the new features that we introduced to the Code Coverage Results window in Visual Studio Enterprise 2022. These features are:
We have changed how we merge reports. Now we combine projects in reports if they use the same source code. For example, if a project is targeting different frameworks, the merged report will have only one item for the project with the coverage data added together.
We have introduced a new method of seeing coverage in the editor. Margin glyphs use solid rectangles in the margin to indicate covered lines, stripe rectangles to indicate partially covered lines, and open rectangles in the margin to indicate uncovered lines.
It is helpful when you have C++ code and unit test projects are using static libraries. For project view, each unit test project shows coverage only for the code run in their own tests. But source view combines coverage run for all test projects.
Changeset report filters the coverage report and shows coverage statistics only for the changes made in current local git branch. It helps developers to identify coverage status of their own changes and improve code coverage of new code.
You can use any combination of views together. For example, you can display only the methods that have less than 80% block coverage in your current branch. The coverage windows and the code editor will show the filtered results.
I am using the most updated SF plugin, Visual Studio Code and sf-cli against our internal sandbox environment. I have an Apex class that has tests in multiple files. I would like to run a test suite which contains all the tests and then see the code coverage color highlighting in Visual Studio.
Open the Command Palette (Ctrl-Shift-P/Cmd-Shift-P), and find the command SFDX: Run Apex Test Suite, and select the suite. Your code coverage will automatically be updated. You won't get code coverage if Salesforcedx-vscode-core: Retrieve-test-code-coverage is not enabled. Open the Settings panel (Ctrl-,/Cmd-,) and type in "code coverage". This box should be checked.
I have been trying to sort out why our code coverage numbers between Visual Studio and SonarQube do not agree. We have integrated SonarQube into our builds and everything seems to be working well. We build the solution in Visual Studio 2015 and then execute unit tests while gathering code coverage. We get the associated .coverage and .coveragexml files normally. The SonarQube process appears to parse the .coveragexml file and upload its contents. However, the reported code coverage values are not in line with the files generated by the testing.
The main idea of this article is to highlight the fact that comparing the coverage coming from SonarQube and the coverage coming from other tools is often misleading, SonarQube should be the reference point .
If you'd like to read these release notes online, go to Updates on code.visualstudio.com.Insiders: Want to try new features as soon as possible? You can download the nightly Insiders build and try the latest updates as soon as they are available.
We expanded support for opening editors into floating windows to custom editors, and generally all editors that use the webview API. This includes markdown preview, browser preview, and complex custom editors, such as our hex editor.
Note: due to a technical limitation, moving a webview-based editor between windows requires the contents of that editor to reload. It is then up to the editor to restore the state you had previously accumulated. In some cases your state might be reset, as if you had opened the editor for the first time.
You can tailor these labels to your preference by adding entries under the workbench.editor.customLabels.patterns setting. Each entry should include a glob pattern that matches file paths and a template that defines the new name for the editor tab. This customization only applies when a file's path matches the specified pattern. Whether a pattern matches, depends on if it's defined as a relative or absolute file path pattern.
To enable or disable these custom labels, use the workbench.editor.customLabels.enabled setting. This enables you to switch to the original editor names at any time, without having to remove your custom patterns.
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