[M6] tests: levenshtein + pc_scan + brute_scan + findmodule_scan + last_failure_dir + cmd_linkdb_add + codegen PkgConfig/brute-force

tests/findmodule_scan_live.cpp

@@ -0,0 +1,67 @@
+#include <catch2/catch_test_macros.hpp>
+
+import cargoxx.resolver;
+import cargoxx.util;
+import std;
+
+using cargoxx::resolver::findmodule_scan;
+using cargoxx::util::ErrorCode;
+
+// `findmodule_scan` shells out to `cmake -P` to discover CMAKE_ROOT.
+// Gate the test on the same env var we use for other live probes so
+// CI without cmake can still pass.
+namespace {
+
+auto live_tests_enabled() -> bool {
+    auto* e = std::getenv("CARGOXX_NETWORK_TESTS");
+    return e != nullptr && *e != 0;
+}
+
+} // namespace
+
+TEST_CASE("findmodule_scan picks FindSQLite3 for 'sqlite'",
+          "[resolver][findmodule_scan][live]") {
+    if (!live_tests_enabled()) {
+        SKIP("CARGOXX_NETWORK_TESTS not set");
+    }
+    auto r = findmodule_scan("sqlite");
+    REQUIRE(r.has_value());
+    REQUIRE(r->find_package == "SQLite3 REQUIRED");
+    REQUIRE_FALSE(r->targets.empty());
+    auto has = [&](std::string_view t) {
+        return std::ranges::find(r->targets, std::string{t}) != r->targets.end();
+    };
+    REQUIRE((has("SQLite3::SQLite3") || has("SQLite::SQLite3")));
+    REQUIRE(r->module_file.filename() == "FindSQLite3.cmake");
+}
+
+TEST_CASE("findmodule_scan picks FindZLIB for 'zlib'",
+          "[resolver][findmodule_scan][live]") {
+    if (!live_tests_enabled()) {
+        SKIP("CARGOXX_NETWORK_TESTS not set");
+    }
+    auto r = findmodule_scan("zlib");
+    REQUIRE(r.has_value());
+    REQUIRE(r->find_package == "ZLIB REQUIRED");
+    REQUIRE(r->module_file.filename() == "FindZLIB.cmake");
+}
+
+TEST_CASE("findmodule_scan picks FindThreads for 'threads'",
+          "[resolver][findmodule_scan][live]") {
+    if (!live_tests_enabled()) {
+        SKIP("CARGOXX_NETWORK_TESTS not set");
+    }
+    auto r = findmodule_scan("threads");
+    REQUIRE(r.has_value());
+    REQUIRE(r->find_package == "Threads REQUIRED");
+}
+
+TEST_CASE("findmodule_scan errors for a totally unknown name",
+          "[resolver][findmodule_scan][live]") {
+    if (!live_tests_enabled()) {
+        SKIP("CARGOXX_NETWORK_TESTS not set");
+    }
+    auto r = findmodule_scan("definitelynotacmaketmodule12345");
+    REQUIRE_FALSE(r.has_value());
+    REQUIRE(r.error().code == ErrorCode::ResolutionUnknownPackage);
+}