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nixpkgs/pkgs/development/ruby-modules/testing/assertions.nix

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{ test, lib, ...}:
{
equal = expected: actual:
if actual == expected then
(test.passed "= ${toString expected}") else
(test.failed (
"expected '${toString expected}'(${builtins.typeOf expected})"
+ " != "+
"actual '${toString actual}'(${builtins.typeOf actual})"
));
beASet = actual:
if builtins.isAttrs actual then
(test.passed "is a set") else
(test.failed "is not a set, was ${builtins.typeOf actual}: ${toString actual}");
haveKeys = expected: actual:
if builtins.all
(ex: builtins.any (ac: ex == ac) (builtins.attrNames actual))
expected then
(test.passed "has expected keys") else
(test.failed "keys differ: expected: [${lib.concatStringsSep ";" expected}] actual: [${lib.concatStringsSep ";" (builtins.attrNames actual)}]");
havePrefix = expected: actual:
if lib.hasPrefix expected actual then
(test.passed "has prefix '${expected}'") else
(test.failed "prefix '${expected}' not found in '${actual}'");
}