Code Comparison from within the Source Code Reviewing how code diffs are covered by tests is made easy thanks to the Search by Coverage of Changes function. refactored methods) and where it is not actually properly covered by tests. Typically, developers write tests for testing automatically refactored and new code.Īnother useful option is to search for diff coupled with code coverage by tests ratio, like asking for methods where the code was changed (i.e. There is often something interesting to learn by reviewing the API usage diff. The Search Change Panel’s options offer various possibilities to explore a code comparison in Visual Studio, including searching for code elements where only code was changed or where only comments were changed, where visibility was changed, where methods or classes were added or removed, and many more possibilities.Īn extra option is to search a diff in third-party code, like asking for which library types are not in use anymore. Moreover, formatting and comment changes are not taken into account here. Not only are all code changes easily identifiable at a glance, but for each method refactored, the developer is just one click away from seeing the code diff in the source files. The result can help your development team to perform Code Diff Reviews. The Search Change Panel is actually a CQLinq code query generator related to code changes.įor example, in the screenshot below, we can see that asking for Method + Change + Code was Changed or was Added generates this code query: from m in Application. The option Code Diff since Baseline opens the search panel where you can perform a Search Change. Double clicking a source file change automatically displays source comparison.Source files are not expanded by default, but expanding them shows any code element changes with the same font-based conventions.Directories that contain changes are expanded.Directories and source files that are new since baseline are bolded.Directories and source files that contain changes are underlined.Code elements are grouped in directories and source files.The result of this code comparison is formatted specifically for an easy code review: The option Source Diff since Baseline edits a code query that matches all code elements. New Issues since Baseline (self explanatory).In the main menu, there are three options related to the baseline The default tool used to diff sources is Visual Studio, but any other source diff tool like WinMerge can be used by navigating to Options > Source File Compare Tool.Ĭode Change Review through Global Code Diff This allows code rules to be enforced for code diff, like the API Breaking Changes rules. This way a source code diff can be performed against the baseline out-of-the-box, with no upfront configuration needed. The code diff feature is based on the concept of a baseline: the current analysis result is compared against an older analysis result, which is called the baseline.NDepend's code diff tool for Visual Studio includes many features Instead, these features can be used as a complementary tool to track changes with a focus on code quality. These features are not meant to compete with or replace the Source Control Manager. NDepend has advanced code evolution and code diff features that can distinguish between code changes (like method behaviour changes) and text changes (like comment changes). In short, SCMs only look at code as text and don’t see the structure of purpose of the code These tools don't distinguish between comment changes, formatting changes, refactored code in methods, added types, method visibility changes or removed fields. But there is mismatch: Git and other Source Control Managers deal with textual changes while Visual Studio deals with lines of code. Nowadays, Visual Studio relies mostly on Git to explore code changes. Code evolution and maintenance are some of the most prominent characteristics of software engineering.
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