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lix/tests/lang/eval-okay-context-introspection.nix
John Ericson 88d8f6ac48 Expand tests to reproduce
The original `builtins.getContext` test from
1d757292d0 would have caught this. The
problem is that b30be6b450 adding
`builtins.appendContext` modified that test to make it test too much at
once, rather than adding a separate test.

We now have isolated tests for both functions, and also a property test
showing everything put together (in the form of an eta rule for strings
with context). This is better coverage and properly reproduces the bug.
2023-01-21 23:50:09 -05:00

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Nix

let
drv = derivation {
name = "fail";
builder = "/bin/false";
system = "x86_64-linux";
outputs = [ "out" "foo" ];
};
path = "${./eval-okay-context-introspection.nix}";
desired-context = {
"${builtins.unsafeDiscardStringContext path}" = {
path = true;
};
"${builtins.unsafeDiscardStringContext drv.drvPath}" = {
outputs = [ "foo" "out" ];
allOutputs = true;
};
};
combo-path = "${path}${drv.outPath}${drv.foo.outPath}${drv.drvPath}";
legit-context = builtins.getContext combo-path;
reconstructed-path = builtins.appendContext
(builtins.unsafeDiscardStringContext combo-path)
desired-context;
# Eta rule for strings with context.
etaRule = str:
str == builtins.appendContext
(builtins.unsafeDiscardStringContext str)
(builtins.getContext str);
in [
(legit-context == desired-context)
(reconstructed-path == combo-path)
(etaRule "foo")
(etaRule drv.drvPath)
(etaRule drv.foo.outPath)
(etaRule (builtins.unsafeDiscardOutputDependency drv.drvPath))
]