Prometheus unit test

exporters/prometheus/BUILD

@@ -142,3 +142,64 @@ cc_library(
         "@com_github_jupp0r_prometheus_cpp//pull",
     ],
 )
+
+cc_library(
+    name = "prometheus_test_helper",
+    hdrs = [
+        "test/prometheus_test_helper.h",
+    ],
+    tags = ["prometheus"],
+    deps = [
+        "//api",
+        "//sdk:headers",
+        "//sdk/src/trace",
+    ],
+)
+
+cc_test(
+    name = "prometheus_exporter_test",
+    srcs = [
+        "test/exporter_test.cc",
+    ],
+    tags = [
+        "prometheus",
+        "test",
+    ],
+    deps = [
+        ":prometheus_exporter",
+        ":prometheus_test_helper",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "prometheus_collector_test",
+    srcs = [
+        "test/collector_test.cc",
+    ],
+    tags = [
+        "prometheus",
+        "test",
+    ],
+    deps = [
+        ":prometheus_collector",
+        ":prometheus_test_helper",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "prometheus_exporter_utils_test",
+    srcs = [
+        "test/exporter_utils_test.cc",
+    ],
+    tags = [
+        "prometheus",
+        "test",
+    ],
+    deps = [
+        ":prometheus_exporter_utils",
+        ":prometheus_test_helper",
+        "@com_google_googletest//:gtest_main",
+    ],
+)

exporters/prometheus/test/CMakeLists.txt

@@ -10,4 +10,15 @@ if(WITH_METRICS_PREVIEW)
       TEST_PREFIX exporter.
       TEST_LIST ${testname})
   endforeach()
+else()
+  foreach(testname exporter_test collector_test exporter_utils_test)
+    add_executable(${testname} "${testname}.cc")
+    target_link_libraries(
+      ${testname} ${GTEST_BOTH_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT}
+      prometheus_exporter prometheus-cpp::pull)
+    gtest_add_tests(
+      TARGET ${testname}
+      TEST_PREFIX exporter.
+      TEST_LIST ${testname})
+  endforeach()
 endif()