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Update best_practices.md let section to also reference let! variables.

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Artur Martsinkovskyi 2018-10-19 15:38:30 +00:00
parent c316c80430
commit cb275a33e3
1 changed files with 8 additions and 4 deletions
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12
doc/development/testing_guide/best_practices.md
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@ -158,12 +158,13 @@ instead of 30+ seconds in case of a regular `spec_helper`.
### `let` variables
GitLab's RSpec suite has made extensive use of `let` variables to reduce
duplication. However, this sometimes [comes at the cost of clarity][lets-not],
GitLab's RSpec suite has made extensive use of `let`(along with it strict, non-lazy
version `let!`) variables to reduce duplication. However, this sometimes [comes at the cost of clarity][lets-not],
so we need to set some guidelines for their use going forward:
- `let` variables are preferable to instance variables. Local variables are
preferable to `let` variables.
- `let!` variables are preferable to instance variables. `let` variables
are preferable to `let!` variables. Local variables are preferable to
`let` variables.
- Use `let` to reduce duplication throughout an entire spec file.
- Don't use `let` to define variables used by a single test; define them as
local variables inside the test's `it` block.
@ -173,6 +174,9 @@ so we need to set some guidelines for their use going forward:
- Try to avoid overriding the definition of one `let` variable with another.
- Don't define a `let` variable that's only used by the definition of another.
Use a helper method instead.
- `let!` variables should be used only in case if strict evaluation with defined
order is required, otherwise `let` will suffice. Remember that `let` is lazy and won't
be evaluated until it is referenced.
[lets-not]: https://robots.thoughtbot.com/lets-not