Update index.qmd

Author: yebai

tutorials/docs-01-contributing-guide/index.qmd

@@ -28,7 +28,13 @@ The test suite subdivides into files in the `test` folder, and you can run only
 Pkg.test("Turing"; test_args=["optim", "hmc", "--skip", "ext"])
 ```
 
-This one would run all files with "optim" or "hmc" in their path, such as `test/optimisation/Optimisation.jl`, but not files with "ext" in their path. Alternatively you can set these arguments as command line arguments when you run Julia, or otherwise set the global `ARGS` variable, and call `include("test/runtests.jl")`.
+This one would run all files with "optim" or "hmc" in their path, such as `test/optimisation/Optimisation.jl`, but not files with "ext" in their path. Alternatively, you can set these arguments as command line arguments when you run Julia
+
+```julia
+julia --project=. -e 'import Pkg; Pkg.test(; test_args=ARGS)' -- optim hmc --skip ext
+```
+
+Or otherwise, set the global `ARGS` variable, and call `include("test/runtests.jl")`. 
 
 ### Style Guide