lix/tests/unit/libutil/closure.cc
John Ericson f7f37035c8 Move tests to separate directories, and document
Today, with the tests inside a `tests` intermingled with the
corresponding library's source code, we have a few problems:

- We have to be careful that wildcards don't end up with tests being
  built as part of Nix proper, or test headers being installed as part
  of Nix proper.

- Tests in libraries but not executables is not right:

  - It means each executable runs the previous unit tests again, because
    it needs the libraries.

  - It doesn't work right on Windows, which doesn't want you to load a
    DLL just for the side global variable . It could be made to work
    with the dlopen equivalent, but that's gross!

This reorg solves these problems.

There is a remaining problem which is that sibbling headers (like
`hash.hh` the test header vs `hash.hh` the main `libnixutil` header) end
up shadowing each other. This PR doesn't solve that. That is left as
future work for a future PR.

Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>

(cherry picked from commit 91b6833686a6a6d9eac7f3f66393ec89ef1d3b57)
(cherry picked from commit a61e42adb528b3d40ce43e07c79368d779a8b624)
2023-12-01 13:05:03 -05:00

70 lines
1.8 KiB
C++

#include "closure.hh"
#include <gtest/gtest.h>
namespace nix {
using namespace std;
map<string, set<string>> testGraph = {
{ "A", { "B", "C", "G" } },
{ "B", { "A" } }, // Loops back to A
{ "C", { "F" } }, // Indirect reference
{ "D", { "A" } }, // Not reachable, but has backreferences
{ "E", {} }, // Just not reachable
{ "F", {} },
{ "G", { "G" } }, // Self reference
};
TEST(closure, correctClosure) {
set<string> aClosure;
set<string> expectedClosure = {"A", "B", "C", "F", "G"};
computeClosure<string>(
{"A"},
aClosure,
[&](const string currentNode, function<void(promise<set<string>> &)> processEdges) {
promise<set<string>> promisedNodes;
promisedNodes.set_value(testGraph[currentNode]);
processEdges(promisedNodes);
}
);
ASSERT_EQ(aClosure, expectedClosure);
}
TEST(closure, properlyHandlesDirectExceptions) {
struct TestExn {};
set<string> aClosure;
EXPECT_THROW(
computeClosure<string>(
{"A"},
aClosure,
[&](const string currentNode, function<void(promise<set<string>> &)> processEdges) {
throw TestExn();
}
),
TestExn
);
}
TEST(closure, properlyHandlesExceptionsInPromise) {
struct TestExn {};
set<string> aClosure;
EXPECT_THROW(
computeClosure<string>(
{"A"},
aClosure,
[&](const string currentNode, function<void(promise<set<string>> &)> processEdges) {
promise<set<string>> promise;
try {
throw TestExn();
} catch (...) {
promise.set_exception(std::current_exception());
}
processEdges(promise);
}
),
TestExn
);
}
}