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|
{ lib, pkgs, depot, ... }:
# Run a nix testsuite.
#
# The tests are simple assertions on the nix level,
# and can use derivation outputs if IfD is enabled.
#
# You build a testsuite by bundling assertions into
# “it”s and then bundling the “it”s into a testsuite.
#
# Running the testsuite will abort evaluation if
# any assertion fails.
#
# Example:
#
# runTestsuite "myFancyTestsuite" [
# (it "does an assertion" [
# (assertEq "42 is equal to 42" "42" "42")
# (assertEq "also 23" 23 23)
# ])
# (it "frmbls the brlbr" [
# (assertEq true false)
# ])
# ]
#
# will fail the second it group because true is not false.
let
inherit (depot.nix.yants)
sum
struct
string
any
defun
list
drv
;
bins = depot.nix.getBins pkgs.coreutils [ "printf" "touch" ];
# rewrite the builtins.partition result
# to use `ok` and `err` instead of `right` and `wrong`.
partitionTests = pred: xs:
let res = builtins.partition pred xs;
in {
ok = res.right;
err = res.wrong;
};
# The result of an assert,
# either it’s true (yep) or false (nope).
# If it’s nope, we return the left and right
# side of the assert, together with the description.
AssertResult =
sum "AssertResult" {
yep = struct "yep" {
test = string;
};
nope = struct "nope" {
test = string;
left = any;
right = any;
};
};
# Result of an it. An it is a bunch of asserts
# bundled up with a good description of what is tested.
ItResult =
struct "ItResult" {
it-desc = string;
asserts = list AssertResult;
};
# assert that left and right values are equal
assertEq = defun [ string any any AssertResult ]
(desc: left: right:
if left == right
then { yep = { test = desc; }; }
else { nope = {
test = desc;
inherit left right;
};
});
# Annotate a bunch of asserts with a descriptive name
it = desc: asserts: {
it-desc = desc;
inherit asserts;
};
# Run a bunch of its and check whether all asserts are yep.
# If not, abort evaluation with `throw`
# and print the result of the test suite.
#
# Takes a test suite name as first argument.
runTestsuite = defun [ string (list ItResult) drv ]
(name: itResults:
let
goodAss = ass: {
good = AssertResult.match ass {
yep = _: true;
nope = _: false;
};
x = ass;
};
goodIt = it: {
inherit (it) it-desc;
asserts = partitionTests (ass:
AssertResult.match ass {
yep = _: true;
nope = _: false;
}) it.asserts;
};
goodIts = partitionTests (it: (goodIt it).asserts.err == []);
res = goodIts itResults;
in
if res.err == []
then depot.nix.runExecline.local "testsuite-${name}-successful" {} [
"importas" "out" "out"
"if" [ bins.printf "%s\n" "testsuite ${name} successful!" ]
bins.touch "$out"
]
else depot.nix.runExecline.local "testsuite-${name}-failed" {} [
"importas" "out" "out"
"if" [
bins.printf "%s\n%s\n"
"testsuite ${name} failed!"
(lib.generators.toPretty {} res)
]
"exit" "1"
]);
in {
inherit
assertEq
it
runTestsuite
;
}
|
