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# How to write a test
Test are simple derivations, put into the `by-name` directory. As you
often want to test configuration, the 'standard' nixos-vm-test function
starts a vm with the specified configuration and lets you run a python
test script.
But, I've noticed, that most of my tests in this nixos-configuration are
actually testing the home-manager config of a program. As such I've built
a test infrastructure on top of the pre-existing nixos-vm-tests. It is
further described in the `mkTest` section.
## `mkTest`
A standard application test would look somewhat like this:
```nix
{mkTest}:
mkTest {
name = "my-tests";
# The configuration to add.
# In this case, the less config is being tested.
configuration = {
imports = [
../../../../modules/by-name/le/less/module.nix
];
config.soispha.programs.less.enable = true;
};
# Files that are provided at the test directory.
# In this case, the test dir would have a `./data/test.file`
# path pre-populated with the
# contents of the file at the lhs.
testData = {
"data/test.file" = ./data/test.file;
};
# The description of what to do in the test.
description = ./test.desc;
# A sha256 hashsum of the concatenated output of the program.
# This can be `null` to disable the checksum mechanism.
hash = "87901231393b51cdd45bbb4339a32db2894a3a5ab164cb5c7a8fa14721fdcba7";
}
```
### The test description file
All line starting with `#` or only containing white space are
ignored. Additionally, all leading and trailing white space is stripped
before evaluating.
The general syntax is:
```
COMMAND ARGS
```
where `COMMAND` is one of the commands listed in [Commands](#### Commands)
The `ARGS` are the verbatim content from the space after the `COMMAND`
to the end of line character.
You can run the description file, similarly as in the tests via the `run_test_description`
package exported by the flake.
#### Commands
##### `Type`
Send the `ARGS` to the application. This interprets `ARGS` as specified
by the tmux (1) man page on `send-keys`.
#### `Sleep`
Sleep for `ARGS` seconds.
#### `Expect`
Grep the currently visible screen for the regex `ARGS`. This regex
must match.
#### `ExpectNot`
Does the same thing as [Expect](##### Expect), but enforces, that the
regex does not match.
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