diff --git a/test/chronoscope/nts_test.exs b/test/chronoscope/nts_test.exs
index 8924b64..29ae414 100644
--- a/test/chronoscope/nts_test.exs
+++ b/test/chronoscope/nts_test.exs
@@ -67,6 +67,105 @@ defmodule Chronoscope.NTSTest do
     end
   end
 
+  describe "Chronoscope.NTS.start_client()" do
+    test "starts a client" do
+      RegistryMock
+      |> expect(:lookup, fn _, "test:1" -> [] end)
+
+      DynamicSupervisorMock
+      |> expect(
+        :start_child,
+        fn Chronoscope.NTS.DynamicSupervisor,
+           {Chronoscope.NTS.Client,
+            [
+              server: %{host: "test", port: 1},
+              name: {:via, RegistryMock, {Chronoscope.NTS.Registry, "test:1"}}
+            ]} ->
+          {:ok, 2}
+        end
+      )
+
+      assert NTS.start_client(%{host: "test", port: 1}) == 2
+    end
+
+    test "returns an existing client" do
+      RegistryMock
+      |> expect(:lookup, fn _, "test:1" -> [{1, nil}] end)
+
+      assert NTS.start_client(%{host: "test", port: 1}) == 1
+    end
+  end
+
+  describe "Chronoscope.NTS.auto_refresh()" do
+    test "sets up auto refresh for a new client" do
+      RegistryMock
+      |> expect(:lookup, fn _, "test:1" -> [] end)
+
+      DynamicSupervisorMock
+      |> expect(
+        :start_child,
+        fn Chronoscope.NTS.DynamicSupervisor,
+           {Chronoscope.NTS.Client,
+            [
+              server: %{host: "test", port: 1},
+              name: {:via, RegistryMock, {Chronoscope.NTS.Registry, "test:1"}}
+            ]} ->
+          {:ok, 2}
+        end
+      )
+
+      GenServerMock
+      |> expect(:call, fn 2, :auto_refresh, 10_000 -> :ok end)
+
+      assert NTS.auto_refresh(%{host: "test", port: 1}) == :ok
+    end
+
+    test "sets up auto refresh for an existing client" do
+      RegistryMock
+      |> expect(:lookup, fn _, "test:1" -> [{2, nil}] end)
+
+      GenServerMock
+      |> expect(:call, fn 2, :auto_refresh, 10_000 -> :ok end)
+
+      assert NTS.auto_refresh(%{host: "test", port: 1}) == :ok
+    end
+  end
+
+  describe "Chronoscope.NTS.cancel_auto_refresh()" do
+    test "cancels auto refresh for a new client" do
+      RegistryMock
+      |> expect(:lookup, fn _, "test:1" -> [] end)
+
+      DynamicSupervisorMock
+      |> expect(
+        :start_child,
+        fn Chronoscope.NTS.DynamicSupervisor,
+           {Chronoscope.NTS.Client,
+            [
+              server: %{host: "test", port: 1},
+              name: {:via, RegistryMock, {Chronoscope.NTS.Registry, "test:1"}}
+            ]} ->
+          {:ok, 2}
+        end
+      )
+
+      GenServerMock
+      |> expect(:call, fn 2, :cancel_auto_refresh, 10_000 -> :ok end)
+
+      assert NTS.cancel_auto_refresh(%{host: "test", port: 1}) == :ok
+    end
+
+    test "cancels auto refresh for an existing client" do
+      RegistryMock
+      |> expect(:lookup, fn _, "test:1" -> [{2, nil}] end)
+
+      GenServerMock
+      |> expect(:call, fn 2, :cancel_auto_refresh, 10_000 -> :ok end)
+
+      assert NTS.cancel_auto_refresh(%{host: "test", port: 1}) == :ok
+    end
+  end
+
   describe "Chronoscope.NTS.remove()" do
     test "does nothing if the client doesn't exist" do
       RegistryMock