1 files changed, 68 insertions, 0 deletions
diff --git a/mocktracer/test/tracer_factory_test.cpp b/mocktracer/test/tracer_factory_test.cpp
new file mode 100644
index 0000000..a27b87c
--- /dev/null
+++ b/mocktracer/test/tracer_factory_test.cpp
@@ -0,0 +1,68 @@
+#include <opentracing/mocktracer/tracer_factory.h>
+#include <cstdio>
+#include <random>
+#include <string>
+
+#define CATCH_CONFIG_MAIN
+#include <opentracing/catch2/catch.hpp>
+using namespace opentracing;
+using namespace mocktracer;
+
+TEST_CASE("tracer_factory") {
+  MockTracerFactory tracer_factory;
+  std::string error_message;
+
+  SECTION("Creating a tracer from a nullptr yields an error.") {
+    const char* configuration = nullptr;
+    auto tracer_maybe = tracer_factory.MakeTracer(configuration, error_message);
+    REQUIRE(!tracer_maybe);
+    REQUIRE(!error_message.empty());
+  }
+
+  SECTION("Creating a tracer from an empty string yields an error.") {
+    const char* configuration = "";
+    auto tracer_maybe = tracer_factory.MakeTracer(configuration, error_message);
+    REQUIRE(!tracer_maybe);
+    REQUIRE(!error_message.empty());
+  }
+
+  SECTION("Creating a tracer from invalid JSON yields an error.") {
+    const char* configuration = "{ abc";
+    auto tracer_maybe = tracer_factory.MakeTracer(configuration, error_message);
+    REQUIRE(!tracer_maybe);
+    REQUIRE(!error_message.empty());
+  }
+
+  SECTION(
+      "Creating a tracer from valid JSON but an invalid configuration "
+      "yields an error.") {
+    const char* configuration = R"({ "abc": 123 })";
+    auto tracer_maybe = tracer_factory.MakeTracer(configuration, error_message);
+    REQUIRE(!tracer_maybe);
+    REQUIRE(!error_message.empty());
+    REQUIRE(tracer_maybe.error() == invalid_configuration_error);
+  }
+
+  SECTION("Creating a tracer with an invalid output_file yields an error.") {
+    const char* configuration = R"({ "output_file": "" })";
+    auto tracer_maybe = tracer_factory.MakeTracer(configuration, error_message);
+    REQUIRE(!tracer_maybe);
+    REQUIRE(!error_message.empty());
+    REQUIRE(tracer_maybe.error() == invalid_configuration_error);
+  }
+
+  SECTION("Creating a tracer with a valid config succeeds.") {
+    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 =
+        tracer_factory.MakeTracer(configuration.c_str(), error_message);
+    REQUIRE(tracer_maybe);
+
+    std::remove(span_filename.c_str());
+  }
+}