depot/third_party/tvl/nix/emptyDerivation/tests.nix

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{ emptyDerivation, getBins, pkgs, writeExecline, runTestsuite, it, assertEq }:
let
bins = getBins pkgs.s6-portable-utils [ "s6-echo" ];
empty = it "is just an empty path" [
(assertEq "path empty"
(builtins.readFile emptyDerivation)
"")
];
fooOut = emptyDerivation {
builder = writeExecline "foo-builder" {} [
"importas" "out" "out"
"redirfd" "-w" "1" "$out"
bins.s6-echo "-n" "foo"
];
};
overrideBuilder = it "can override the builder" [
(assertEq "output is foo"
(builtins.readFile fooOut)
"foo")
(assertEq "can add new drv variables"
(emptyDerivation { foo = "bar"; }).foo
"bar")
];
in runTestsuite "emptyDerivation" [
empty
overrideBuilder
]