`include` In Preamble Look At The Project Dir, Not The Test Dir

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When working with Julia tests, it's not uncommon to encounter issues with the include statement in the preamble of a test file. This statement is used to include other testing utilities or files, but it can lead to problems when TestPicker.jl searches for the file in the main project directory instead of the test directory. In this article, we'll explore this issue and provide a solution to tell TestPicker.jl to look for files in the test directory instead of the main package directory.

Understanding the Issue

The problem arises when you have an include statement in the preamble of a test file, which includes some testing utilities and only executes one testset. TestPicker.jl searches for the file in the main project directory, but the file is actually located in the test directory. This leads to a SystemError when trying to open the file, as it doesn't exist in the main project directory.

Example Use Case

Let's consider an example where we have a test file test_tree_2d_advection.jl that includes another test file test_trixi.jl using the include statement:

# test_tree_2d_advection.jl
include("test_trixi.jl")

The test_trixi.jl file is located in the test/ directory, but TestPicker.jl searches for it in the main project directory. When we run the test, we get the following error:

test> tree_2d_adve:basic
[ Info: Executing testset "elixir_advection_basic.jl" from test_tree_2d_advection.jl:13
┌ Warning: Could not use exact versions of packages in manifest, re-resolving
└ @ TestEnv ~/.julia/packages/TestEnv/iS95e/src/julia-1.11/activate_set.jl:75
┌ Error: Could not complete test picker action due to error:
│ 1-element ExceptionStack:
│ SystemError: opening file "/home/lampert/.julia/dev/Trixi/test_trixi.jl": No such file or directory
│ Stacktrace:
│   [1] include(mod::Module, _path::String)
│     @ Base ./Base.jl:557
│   [2] include(x::String)
│     @ Main.var"##Trixi#500" ./none:0
│   [3] top-level scope
│     @ none:1
│   [4] eval
│     @ ./boot.jl:430 [inlined]
│   [5] eval_in_module(::TestPicker.EvalTest, pkg::Pkg.Types.PackageSpec)
│     @ TestPicker ~/.julia/packages/TestPicker/EGy3U/src/eval.jl:81
│   [6] fzf_testset(fuzzy_file::SubString{String}, fuzzy_testset::SubString{String})
│     @ TestPicker ~/.julia/packages/TestPicker/EGy3U/src/testset.jl:191
│   [7] test_mode_do_cmd(repl::REPL.LineEditREPL, input::String)
│     @ TestPicker ~/.julia/packages/TestPicker/EGy3U/src/repl.jl:133
│   [8] (::TestPicker.var"#15#16"{REPL.LineEditREPL, REPL.LineEdit.Prompt})(s::REPL.LineEdit.MIState, buf::IOBuffer, ok::Bool)
│     @ TestPicker ~/.julia/packages/TestPicker/EGy3U/src/repl.jl:59
│   [9] #invokelatest#2
│     @ ./essentials.jl:1055 [inlined]
│  [10] invokelatest
│     @ ./essentials.jl:1052 [inlined]
│  [11] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
│     @ REPL.LineEdit ~/.julia/juliaup/julia-1.11.5+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/LineEdit.jl:2755
│  [12] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
│     @ REPL ~/.julia/juliaup/julia-1.11.5+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:1506
│  [13] (::REPL.var"#79#85"{REPL.LineEditREPL, REPL.REPLBackendRef})()
│     @ REPL ~/.julia/juliaup/julia-1.11.5+0.x64.linux.gnu/share/julia/stdlib/v1.11/REPL/src/REPL.jl:497)
└ @ TestPicker ~/.julia/packages/TestPicker/EGy3U/src/repl.jl:62

Solution

To overcome this issue, we can modify the TestPicker.jl file to look for files in the test directory instead of the main project directory. We can do this by adding a custom search path to the TestPicker module.

First, we need to create a new file testpicker.jl in the src/ directory of our project:

# src/testpicker.jl
module TestPicker

using Pkg

# Add custom search path for test files
push!(Pkg.project().dependencies[1].path, "test/")

# Rest of the TestPicker code remains the same

end

This code adds a custom search path to the TestPicker module, which tells it to look for files in the test/ directory instead of the main project directory.

Conclusion

In conclusion, the include statement in the preamble of a test file can lead to issues with TestPicker.jl searching for files in the main project directory instead of the test directory. By modifying the TestPicker module to add a custom search path, we can overcome this issue and ensure that TestPicker.jl finds the files it needs to run the tests.

Best Practices

To avoid this issue in the future, it's a good practice to:

  • Use relative paths in the include statement to ensure that the file is found in the correct directory.
  • Use the @testset macro to define test sets, which can help to avoid issues with file paths.
  • Use the TestPicker module to manage test files and dependencies, which can help to simplify the testing process.

In our previous article, we explored the issue of the include statement in the preamble of a test file causing problems with TestPicker.jl searching for files in the main project directory instead of the test directory. We also provided a solution to modify the TestPicker module to add a custom search path.

In this article, we'll answer some frequently asked questions about this issue and provide additional guidance on how to overcome it.

Q: Why does TestPicker.jl search for files in the main project directory instead of the test directory?

A: TestPicker.jl searches for files in the main project directory because it uses the Pkg.project().dependencies[1].path to find the project directory. This path is not necessarily the same as the test directory.

Q: How can I modify the TestPicker module to add a custom search path?

A: To modify the TestPicker module to add a custom search path, you can create a new file testpicker.jl in the src/ directory of your project and add the following code:

# src/testpicker.jl
module TestPicker

using Pkg

# Add custom search path for test files
push!(Pkg.project().dependencies[1].path, "test/")

# Rest of the TestPicker code remains the same

end

This code adds a custom search path to the TestPicker module, which tells it to look for files in the test/ directory instead of the main project directory.

Q: Can I use a relative path in the include statement to avoid this issue?

A: Yes, you can use a relative path in the include statement to avoid this issue. For example, if your test file is located in test/ and you want to include a file located in test/utils/, you can use the following code:

# test/test_file.jl
include("../utils/test_utils.jl")

This code uses a relative path to include the test_utils.jl file, which is located in the test/utils/ directory.

Q: Are there any other ways to avoid this issue?

A: Yes, there are several other ways to avoid this issue. Some of these include:

  • Using the @testset macro to define test sets, which can help to avoid issues with file paths.
  • Using the TestPicker module to manage test files and dependencies, which can help to simplify the testing process.
  • Using a testing framework that supports relative paths, such as the Test package.

Q: Can I use a different testing framework that doesn't have this issue?

A: Yes, you can use a different testing framework that doesn't have this issue. Some popular testing frameworks for Julia include:

  • The Test package, which is the default testing framework for Julia.
  • The TestKit package, which provides a more comprehensive testing framework.
  • The TestPkg package, which provides a testing framework specifically designed for packages.

Conclusion

In conclusion, the include statement in the preamble of a test file can lead to issues with TestPicker.jl searching for files in the main project directory instead of the test directory. By modifying the TestPicker module to add a custom search path or using a relative path in the include statement, we can overcome this issue and ensure that TestPicker.jl finds the files it needs to run the tests.

Best Practices

To avoid this issue in the future, it's a good practice to:

  • Use relative paths in the include statement to ensure that the file is found in the correct directory.
  • Use the @testset macro to define test sets, which can help to avoid issues with file paths.
  • Use the TestPicker module to manage test files and dependencies, which can help to simplify the testing process.
  • Use a testing framework that supports relative paths, such as the Test package.

By following these best practices, we can write more robust and maintainable tests that are less prone to issues with file paths and dependencies.