1 files changed, 90 insertions, 0 deletions
diff --git a/test/dynamic_load_test.cpp b/test/dynamic_load_test.cpp
new file mode 100644
index 0000000..8ad76e3
--- /dev/null
+++ b/test/dynamic_load_test.cpp
@@ -0,0 +1,90 @@
+#include <opentracing/dynamic_load.h>
+#include <cstdio>
+#include <fstream>
+#include <iterator>
+#include <random>
+using namespace opentracing;
+
+#define CATCH_CONFIG_RUNNER
+#include <opentracing/catch2/catch.hpp>
+
+static std::string mocktracer_library;
+
+TEST_CASE("dynamic_load") {
+  std::string error_message;
+
+  SECTION(
+      "Dynamically loading a library that doesn't exists gives a proper error "
+      "code.") {
+    auto handle_maybe = DynamicallyLoadTracingLibrary("abc/123", error_message);
+    REQUIRE(!handle_maybe);
+    CHECK(handle_maybe.error() == dynamic_load_failure_error);
+  }
+
+  error_message.clear();
+  auto handle_maybe =
+      DynamicallyLoadTracingLibrary(mocktracer_library.c_str(), error_message);
+  REQUIRE(handle_maybe);
+  REQUIRE(error_message.empty());
+
+  SECTION("Creating a tracer from invalid json gives an error.") {
+    auto tracer_maybe =
+        handle_maybe->tracer_factory().MakeTracer("abc 123", error_message);
+    REQUIRE(!tracer_maybe);
+  }
+
+  SECTION("Creating a tracer with an invalid output_file gives an error.") {
+    auto tracer_maybe = handle_maybe->tracer_factory().MakeTracer(
+        R"({"output_file": ""})", error_message);
+    REQUIRE(!tracer_maybe);
+    REQUIRE(tracer_maybe.error() == invalid_configuration_error);
+  }
+
+  SECTION(
+      "We can create spans from an OpenTracing library dynamically loaded.") {
+    std::string span_filename{"spans."};
+    const auto random_id = std::random_device{}();
+    span_filename.append(std::to_string(random_id));
+    std::string configuration = R"({ "output_file": ")";
+    configuration.append(span_filename);
+    configuration.append(R"(" })");
+
+    {
+      auto tracer_maybe = handle_maybe->tracer_factory().MakeTracer(
+          configuration.c_str(), error_message);
+      REQUIRE(tracer_maybe);
+      auto tracer = *tracer_maybe;
+      tracer->StartSpan("abc");
+      tracer->Close();
+    }
+
+    std::ifstream istream{span_filename};
+    REQUIRE(istream.good());
+    std::string spans_json{std::istreambuf_iterator<char>{istream},
+                           std::istreambuf_iterator<char>{}};
+    istream.close();
+    std::remove(span_filename.c_str());
+    CHECK(!spans_json.empty());
+  }
+}
+
+int main(int argc, char* argv[]) {
+  Catch::Session session;
+
+  using namespace Catch::clara;
+  auto cli = session.cli() | Opt(mocktracer_library,
+                                 "mocktracer_library")["--mocktracer_library"];
+
+  session.cli(cli);
+  int rcode = session.applyCommandLine(argc, argv);
+  if (rcode != 0) {
+    return rcode;
+  }
+
+  if (mocktracer_library.empty()) {
+    std::cerr << "Must provide mocktracer_library!\n";
+    return -1;
+  }
+
+  return session.run();
+}