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Move tests to separate directories, and document

Browse source 
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 91b6833686)
This commit is contained in:
John Ericson 2023-08-25 10:20:28 -04:00
parent 5e265bc140
commit a61e42adb5
133 changed files with 464 additions and 352 deletions
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123
src/libstore/tests/nar-info-disk-cache.cc
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@ -1,123 +0,0 @@
#include "nar-info-disk-cache.hh"
#include <gtest/gtest.h>
#include <rapidcheck/gtest.h>
#include "sqlite.hh"
#include <sqlite3.h>
namespace nix {
TEST(NarInfoDiskCacheImpl, create_and_read) {
// This is a large single test to avoid some setup overhead.
int prio = 12345;
bool wantMassQuery = true;
Path tmpDir = createTempDir();
AutoDelete delTmpDir(tmpDir);
Path dbPath(tmpDir + "/test-narinfo-disk-cache.sqlite");
int savedId;
int barId;
SQLite db;
SQLiteStmt getIds;
{
auto cache = getTestNarInfoDiskCache(dbPath);
// Set up "background noise" and check that different caches receive different ids
{
auto bc1 = cache->createCache("https://bar", "/nix/storedir", wantMassQuery, prio);
auto bc2 = cache->createCache("https://xyz", "/nix/storedir", false, 12);
ASSERT_NE(bc1, bc2);
barId = bc1;
}
// Check that the fields are saved and returned correctly. This does not test
// the select statement yet, because of in-memory caching.
savedId = cache->createCache("http://foo", "/nix/storedir", wantMassQuery, prio);;
{
auto r = cache->upToDateCacheExists("http://foo");
ASSERT_TRUE(r);
ASSERT_EQ(r->priority, prio);
ASSERT_EQ(r->wantMassQuery, wantMassQuery);
ASSERT_EQ(savedId, r->id);
}
// We're going to pay special attention to the id field because we had a bug
// that changed it.
db = SQLite(dbPath);
getIds.create(db, "select id from BinaryCaches where url = 'http://foo'");
{
auto q(getIds.use());
ASSERT_TRUE(q.next());
ASSERT_EQ(savedId, q.getInt(0));
ASSERT_FALSE(q.next());
}
// Pretend that the caches are older, but keep one up to date, as "background noise"
db.exec("update BinaryCaches set timestamp = timestamp - 1 - 7 * 24 * 3600 where url <> 'https://xyz';");
// This shows that the in-memory cache works
{
auto r = cache->upToDateCacheExists("http://foo");
ASSERT_TRUE(r);
ASSERT_EQ(r->priority, prio);
ASSERT_EQ(r->wantMassQuery, wantMassQuery);
}
}
{
// We can't clear the in-memory cache, so we use a new cache object. This is
// more realistic anyway.
auto cache2 = getTestNarInfoDiskCache(dbPath);
{
auto r = cache2->upToDateCacheExists("http://foo");
ASSERT_FALSE(r);
}
// "Update", same data, check that the id number is reused
cache2->createCache("http://foo", "/nix/storedir", wantMassQuery, prio);
{
auto r = cache2->upToDateCacheExists("http://foo");
ASSERT_TRUE(r);
ASSERT_EQ(r->priority, prio);
ASSERT_EQ(r->wantMassQuery, wantMassQuery);
ASSERT_EQ(r->id, savedId);
}
{
auto q(getIds.use());
ASSERT_TRUE(q.next());
auto currentId = q.getInt(0);
ASSERT_FALSE(q.next());
ASSERT_EQ(currentId, savedId);
}
// Check that the fields can be modified, and the id remains the same
{
auto r0 = cache2->upToDateCacheExists("https://bar");
ASSERT_FALSE(r0);
cache2->createCache("https://bar", "/nix/storedir", !wantMassQuery, prio + 10);
auto r = cache2->upToDateCacheExists("https://bar");
ASSERT_EQ(r->wantMassQuery, !wantMassQuery);
ASSERT_EQ(r->priority, prio + 10);
ASSERT_EQ(r->id, barId);
}
// // Force update (no use case yet; we only retrieve cache metadata when stale based on timestamp)
// {
// cache2->createCache("https://bar", "/nix/storedir", wantMassQuery, prio + 20);
// auto r = cache2->upToDateCacheExists("https://bar");
// ASSERT_EQ(r->wantMassQuery, wantMassQuery);
// ASSERT_EQ(r->priority, prio + 20);
// }
}
}
}