Test: 1/Fix some interdependencies 2/replace -o -> -f

1/ Fix interdependencies: any test can run alone
2/ Replace command line -o by -f
3/ As usual makesome formating, don't hate me if merge conflicting ..

test/README.md

@@ -7,6 +7,7 @@ Vimwiki functionality. It is based on the following tools:
 - [Vader](https://github.com/junegunn/vader.vim)
 - [Vint](https://github.com/Kuniwak/vint)
 
+
 ## Resources
 
 - [Vim patches](http://ftp.vim.org/pub/vim/patches/)
@@ -16,11 +17,13 @@ Vimwiki functionality. It is based on the following tools:
     - [ale](https://github.com/w0rp/ale/tree/master/test)
     - [Other projects](https://github.com/junegunn/vader.vim/wiki/Projects-using-Vader)
 
+
 ## Building Docker Image
 
 To build the Docker image run `docker build -t vimwiki .` from the Vimwiki
 repository root (same location as the Dockerfile).
 
+
 ## Running Tests
 
 ### Manual Steps
@@ -43,7 +46,12 @@ automatically run all tests for all installed vim versions. The vim/nvim
 versions are parsed from the Dockerfile. This script will also run `Vint` for all
 plugin source files. For more information run `./run_tests.sh -h`.
 
-## Inside the container
+
+## Writing Tests
+
+You are advice to write tests at the top of the file where you want to include it because some `Execute` can have some side effect making it hard to debug
+
+### Inside the container
 
 - `$USER` -> `vimtest` : unprivileged => very hard to mess up things
 - `$HOME` -> `/home/vimtest` : but it is readonly !
@@ -51,6 +59,7 @@ plugin source files. For more information run `./run_tests.sh -h`.
 
 For more information, read the [base docker image](https://github.com/tweekmonster/vim-testbed)
 
+
 ## Known Issues
 
 1. neovim v0.2.x does not work correctly with Vader output from the docker
@@ -62,6 +71,7 @@ For more information, read the [base docker image](https://github.com/tweekmonst
    list should be placed in `independent_runs/`.
     - [Vader Issue #199](https://github.com/junegunn/vader.vim/issues/199)
 
+
 ## Notable Vim patches
 
 - `v7.3.831` `getbufvar` added a default value