test(plugins): cover load failure lifecycle

test/plugins.cpp

@@ -0,0 +1,40 @@
+#include "zeroerr/assert.h"
+#include "zeroerr/unittest.h"
+
+#include "plugins/Plugins.h"
+
+#include <string>
+
+using eve::plugins::Plugins;
+
+TEST_CASE("plugins.load.rejectsEmptyPath") {
+    Plugins plugins;
+    CHECK_THROWS((plugins.load(""), false));
+    CHECK_EQ(plugins.isLoaded(""), false);
+}
+
+TEST_CASE("plugins.load.rejectsMissingLibrary") {
+    Plugins plugins;
+    const std::string missing = "evengine-plugin-that-does-not-exist.dll";
+    CHECK_THROWS((plugins.load(missing), false));
+    CHECK_EQ(plugins.isLoaded(missing), false);
+}
+
+TEST_CASE("plugins.load.closesLibraryWithoutEntrypoint") {
+    Plugins plugins;
+#if defined(_WIN32)
+    const std::string library = "kernel32.dll";
+#elif defined(__APPLE__)
+    const std::string library = "/usr/lib/libSystem.B.dylib";
+#else
+    const std::string library = "libm.so.6";
+#endif
+    CHECK_THROWS((plugins.load(library), false));
+    CHECK_EQ(plugins.isLoaded(library), false);
+    CHECK_EQ(plugins.unload(library), false);
+}
+
+TEST_CASE("plugins.unload.unknownPathIsNoop") {
+    Plugins plugins;
+    CHECK_EQ(plugins.unload("not-loaded"), false);
+}