diff --git a/core/tests/CMakeLists.txt b/core/tests/CMakeLists.txt
index 53e6a2ed..d641a852 100644
--- a/core/tests/CMakeLists.txt
+++ b/core/tests/CMakeLists.txt
@@ -1,5 +1,5 @@
 
-add_executable(prometheus_test
+add_executable(prometheus_core_test
   builder_test.cc
   check_names_test.cc
   counter_test.cc
@@ -13,13 +13,13 @@ add_executable(prometheus_test
   utils_test.cc
 )
 
-target_link_libraries(prometheus_test
+target_link_libraries(prometheus_core_test
   PRIVATE
     ${PROJECT_NAME}::core
     GTest::gmock_main
 )
 
 add_test(
-  NAME prometheus_test
-  COMMAND prometheus_test
+  NAME prometheus_core_test
+  COMMAND prometheus_core_test
 )
diff --git a/pull/include/prometheus/exposer.h b/pull/include/prometheus/exposer.h
index c730360c..0917ba98 100644
--- a/pull/include/prometheus/exposer.h
+++ b/pull/include/prometheus/exposer.h
@@ -26,6 +26,8 @@ class PROMETHEUS_CPP_PULL_EXPORT Exposer {
   ~Exposer();
   void RegisterCollectable(const std::weak_ptr<Collectable>& collectable);
 
+  std::vector<int> GetListeningPorts() const;
+
  private:
   std::unique_ptr<CivetServer> server_;
   std::vector<std::weak_ptr<Collectable>> collectables_;
diff --git a/pull/src/exposer.cc b/pull/src/exposer.cc
index 966d04ae..ad22b7e0 100644
--- a/pull/src/exposer.cc
+++ b/pull/src/exposer.cc
@@ -30,4 +30,9 @@ void Exposer::RegisterCollectable(
     const std::weak_ptr<Collectable>& collectable) {
   collectables_.push_back(collectable);
 }
+
+std::vector<int> Exposer::GetListeningPorts() const {
+  return server_->getListeningPorts();
+}
+
 }  // namespace prometheus
diff --git a/pull/tests/CMakeLists.txt b/pull/tests/CMakeLists.txt
index 26e40e61..729c6ee0 100644
--- a/pull/tests/CMakeLists.txt
+++ b/pull/tests/CMakeLists.txt
@@ -1 +1,2 @@
 add_subdirectory(integration)
+add_subdirectory(unit)
diff --git a/pull/tests/unit/BUILD.bazel b/pull/tests/unit/BUILD.bazel
new file mode 100644
index 00000000..fc174146
--- /dev/null
+++ b/pull/tests/unit/BUILD.bazel
@@ -0,0 +1,13 @@
+cc_test(
+    name = "unit",
+    srcs = glob([
+        "*.cc",
+        "*.h",
+    ]),
+    copts = ["-Iexternal/googletest/include"],
+    linkstatic = True,
+    deps = [
+        "//pull",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
diff --git a/pull/tests/unit/CMakeLists.txt b/pull/tests/unit/CMakeLists.txt
new file mode 100644
index 00000000..5c5c4857
--- /dev/null
+++ b/pull/tests/unit/CMakeLists.txt
@@ -0,0 +1,15 @@
+
+add_executable(prometheus_pull_test
+  exposer_test.cc
+)
+
+target_link_libraries(prometheus_pull_test
+  PRIVATE
+    ${PROJECT_NAME}::pull
+    GTest::gmock_main
+)
+
+add_test(
+  NAME prometheus_pull_test
+  COMMAND prometheus_pull_test
+)
diff --git a/pull/tests/unit/exposer_test.cc b/pull/tests/unit/exposer_test.cc
new file mode 100644
index 00000000..0c46f95b
--- /dev/null
+++ b/pull/tests/unit/exposer_test.cc
@@ -0,0 +1,25 @@
+#include "prometheus/exposer.h"
+
+#include <gmock/gmock.h>
+
+namespace prometheus {
+namespace {
+
+using namespace testing;
+
+TEST(ExposerTest, listenOnDistinctPorts) {
+  Exposer firstExposer{"0.0.0.0:0"};
+  auto firstExposerPorts = firstExposer.GetListeningPorts();
+  ASSERT_EQ(1u, firstExposerPorts.size());
+  EXPECT_NE(0, firstExposerPorts.front());
+
+  Exposer secondExposer{"0.0.0.0:0"};
+  auto secondExposerPorts = secondExposer.GetListeningPorts();
+  ASSERT_EQ(1u, secondExposerPorts.size());
+  EXPECT_NE(0, secondExposerPorts.front());
+
+  EXPECT_NE(firstExposerPorts, secondExposerPorts);
+}
+
+}  // namespace
+}  // namespace prometheus