1 files changed, 60 insertions, 0 deletions
diff --git a/src/jaegertracing/opentelemetry-cpp/sdk/test/trace/always_on_sampler_test.cc b/src/jaegertracing/opentelemetry-cpp/sdk/test/trace/always_on_sampler_test.cc
new file mode 100644
index 000000000..c483f9b8b
--- /dev/null
+++ b/src/jaegertracing/opentelemetry-cpp/sdk/test/trace/always_on_sampler_test.cc
@@ -0,0 +1,60 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+#include "opentelemetry/nostd/span.h"
+#include "opentelemetry/sdk/trace/samplers/always_on.h"
+#include "opentelemetry/trace/span_context_kv_iterable_view.h"
+
+#include <gtest/gtest.h>
+#include <map>
+
+using namespace opentelemetry::sdk::trace;
+using namespace opentelemetry::nostd;
+using opentelemetry::trace::SpanContext;
+namespace trace_api = opentelemetry::trace;
+
+TEST(AlwaysOnSampler, ShouldSample)
+{
+  AlwaysOnSampler sampler;
+
+  // A buffer of trace_id with no specific meaning
+  constexpr uint8_t buf[] = {0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 4, 5, 6, 7};
+
+  trace_api::TraceId trace_id_invalid;
+  trace_api::TraceId trace_id_valid(buf);
+  std::map<std::string, int> key_value_container = {{"key", 0}};
+
+  using L = std::vector<std::pair<trace_api::SpanContext, std::map<std::string, std::string>>>;
+  L l1 = {{trace_api::SpanContext(false, false), {}}, {trace_api::SpanContext(false, false), {}}};
+
+  opentelemetry::trace::SpanContextKeyValueIterableView<L> links{l1};
+
+  // Test with invalid (empty) trace id and empty parent context
+  auto sampling_result = sampler.ShouldSample(
+      SpanContext::GetInvalid(), trace_id_invalid, "invalid trace id test",
+      trace_api::SpanKind::kServer,
+      opentelemetry::common::KeyValueIterableView<std::map<std::string, int>>(key_value_container),
+      links);
+
+  ASSERT_EQ(Decision::RECORD_AND_SAMPLE, sampling_result.decision);
+  ASSERT_EQ(nullptr, sampling_result.attributes);
+  ASSERT_EQ("", sampling_result.trace_state->ToHeader());
+
+  // Test with a valid trace id and empty parent context
+  sampling_result = sampler.ShouldSample(
+      SpanContext::GetInvalid(), trace_id_valid, "valid trace id test",
+      trace_api::SpanKind::kServer,
+      opentelemetry::common::KeyValueIterableView<std::map<std::string, int>>(key_value_container),
+      links);
+
+  ASSERT_EQ(Decision::RECORD_AND_SAMPLE, sampling_result.decision);
+  ASSERT_EQ(nullptr, sampling_result.attributes);
+  ASSERT_EQ("", sampling_result.trace_state->ToHeader());
+}
+
+TEST(AlwaysOnSampler, GetDescription)
+{
+  AlwaysOnSampler sampler;
+
+  ASSERT_EQ("AlwaysOnSampler", sampler.GetDescription());
+}