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Contributing, Developer Guide, and Coding Conventions

Thank you for taking the time to improve tester. Below are a few guidelines to check before contributing.


  • Tester is opinionated
  • Tester is lightweight
  • Tester is intuitive
  • Tester is consistent

Dependency Management

Copy dependencies to the vendor folder. See for more details.


It's there to take care of some best practices for you; please use it.

Code Review Guidelines



The rule of thumb is: if go fmt allows it, so be it. The guidelines below intend to make the coding style more consistent.

Vertical Ordering

From Clean Code, Chapter 5: Formatting

We would like a source file to be like a newspaper article. The name should be simple but explanatory. The name, by itself, should be sufficient to tell us whether we are in the right module or not. The topmost parts of the source file should provide the high-level concepts and algorithms. Detail should increase as we move downward, until at the end we find the lowest level functions and details in the source file... In general we want function call dependencies to point in the downward direction. That is, a function that is called should be below a function that does the calling. This creates a nice flow down the source code module from high level to low level.

Also, see, which recommends the following order:

  1. Header: license information, build tags, package documentation.
  2. Imports: related groups separated by blank lines.
  3. Body: the rest of the code starting with the most significant types, and ending with helper functions and helper types.

Line Length

Keep line length under 120 characters for code and 80 for documentation. Break lines in a way that improves readability but still keeps the code compact; for example,

    file, line, "Function call did not panic as expected.\nExpected: %s\n", expectedError)

is readable and more compact than

    "Function call did not panic as expected.\nExpected: %s\n",

Either is definitely more readable than

callable.testContext.errorf(file, line,
    "Function call did not panic as expected.\nExpected: %s\n", expectedError)

Variable Names

Do not prefer c to lineCount; see Clean Code, Chapter 2: Meaningful Names.

There can be no worse reason for using the [variable] name c than because a and b were already taken.

That said, find the shortest name that's self-explanatory:

Shorter names are generally better than longer ones, so long as they are clear. Add no more context to a name than is necessary.

Loop variables can be a single letter (given that the loop block is short).

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