diff --git a/storeapi/test/CMakeLists.txt b/storeapi/test/CMakeLists.txt
index 516959ad3..5ac438c09 100644
--- a/storeapi/test/CMakeLists.txt
+++ b/storeapi/test/CMakeLists.txt
@@ -15,7 +15,7 @@ set(StoreApi_SRCS
     "../base/Exception.hpp"
     "../base/Purchase.hpp"
     "../base/StoreService.hpp"
-    "../agent/ServerStoreService.cpp"
+    "../agent/ServerStoreService.hpp"
     "../gui/ClientStoreService.hpp"
 )
 
diff --git a/storeapi/test/ServerStoreServiceTest.cpp b/storeapi/test/ServerStoreServiceTest.cpp
index a2e154405..0708a62d8 100644
--- a/storeapi/test/ServerStoreServiceTest.cpp
+++ b/storeapi/test/ServerStoreServiceTest.cpp
@@ -8,12 +8,22 @@ namespace StoreApi {
 
 using namespace ::testing;
 
-TEST(UserInfo, PredictableSizes) {
-  auto user = UserInfo::Current().get();
-  auto size = user.id.size();
-  EXPECT_TRUE(size == 0 || size == 64)
-      << "User ID of unexpected size: " << size << " <"
-      << winrt::to_string(user.id) << '\n';
+TEST(ServerStoreService, NoUsersLikeInCI) {
+  auto service = ServerStoreService<NoUsers>{};
+  EXPECT_THROW({auto user = service.CurrentUserInfo();}, Exception);
+}
+
+TEST(ServerStoreService, TooManyUsers) {
+  auto service = ServerStoreService<TooManyUsersContext>{};
+  EXPECT_THROW({auto user = service.CurrentUserInfo();}, Exception);
+}
+
+TEST(ServerStoreService, FindOneUser) {
+  static constexpr char goodHash[] = "goodHash";
+  auto service = ServerStoreService<FindOneUser>{};
+  FindOneUser::goodHash = goodHash;
+  auto user = service.CurrentUserInfo();
+  EXPECT_EQ(user.id, goodHash);
 }
 
 TEST(ServerStoreService, EmptyJwtThrows) {
@@ -21,7 +31,7 @@ TEST(ServerStoreService, EmptyJwtThrows) {
   UserInfo user{.id = L"my@name.com"};
   EXPECT_THROW(
       {
-        auto jwt = service.GenerateUserJwt("this-is-a-web-token", user).get();
+        auto jwt = service.GenerateUserJwt("this-is-a-web-token", user);
       },
       Exception);
 }
@@ -30,19 +40,10 @@ TEST(ServerStoreService, NonEmptyJwtNeverThrows) {
   auto service = ServerStoreService<IdentityJwtContext>{};
   UserInfo user{.id = L"my@name.com"};
   std::string token{"this-is-a-web-token"};
-  auto jwt = service.GenerateUserJwt(token, user).get();
+  auto jwt = service.GenerateUserJwt(token, user);
   EXPECT_EQ(token, jwt);
 }
 
-TEST(ServerStoreService, RealServerFailsUnderTest) {
-  auto service = ServerStoreService{};
-  UserInfo user{.id = L"my@name.com"};
-  std::string token{"this-is-a-web-token"};
-  // This fails because the test is not an app deployed through the store.
-  EXPECT_THROW({ auto jwt = service.GenerateUserJwt(token, user).get(); },
-               Exception);
-}
-
 TEST(ServerStoreService, ExpirationDateUnsubscribed) {
   auto service = ServerStoreService<NeverSubscribedContext>{};
 
diff --git a/storeapi/test/stubs.hpp b/storeapi/test/stubs.hpp
index 2a101fda4..c0c86bdb8 100644
--- a/storeapi/test/stubs.hpp
+++ b/storeapi/test/stubs.hpp
@@ -4,23 +4,16 @@
 
 #include <base/Exception.hpp>
 #include <base/Purchase.hpp>
-// For WinRT basic types and coroutines.
-#include <winrt/windows.foundation.h>
-// For non-WinRT coroutines
-#include <pplawait.h>
-
-// Win32 APIs, such as the Timezone
-#include <windows.h>
-
 #include <chrono>
 #include <functional>
 #include <span>
 #include <stdexcept>
 #include <string>
 #include <vector>
+// For timegm
+#include <time.h>
 
 #if defined _MSC_VER
-#include <time.h>
 #include <windows.h>
 #define timegm _mkgmtime
 #endif
@@ -89,9 +82,8 @@ struct EmptyJwtContext {
     return {Product{.kind = kinds[0], .id = ids[0]}};
   }
 
-  winrt::Windows::Foundation::IAsyncOperation<winrt::hstring> GenerateUserJwt(
-      winrt::hstring hToken, winrt::hstring hUserId) {
-    co_return {};
+  std::string GenerateUserJwt(std::string hToken, std::string hUserId) {
+    return {};
   }
 };
 
@@ -107,9 +99,8 @@ struct IdentityJwtContext {
     return {Product{.kind = kinds[0], .id = ids[0]}};
   }
 
-  winrt::Windows::Foundation::IAsyncOperation<winrt::hstring> GenerateUserJwt(
-      winrt::hstring hToken, winrt::hstring hUserId) {
-    co_return hToken;
+  std::string GenerateUserJwt(std::string hToken, std::string hUserId) {
+    return hToken;
   }
 };
 
@@ -132,9 +123,8 @@ struct NeverSubscribedContext {
     return {Product{.kind = kinds[0], .id = ids[0]}};
   }
 
-  winrt::Windows::Foundation::IAsyncOperation<winrt::hstring> GenerateUserJwt(
-      winrt::hstring hToken, winrt::hstring hUserId) {
-    co_return hToken;
+  std::string GenerateUserJwt(std::string hToken, std::string hUserId) {
+    return hToken;
   }
 };
 
@@ -158,9 +148,8 @@ struct UnixEpochContext {
     return {Product{.kind = kinds[0], .id = ids[0]}};
   }
 
-  winrt::Windows::Foundation::IAsyncOperation<winrt::hstring> GenerateUserJwt(
-      winrt::hstring hToken, winrt::hstring hUserId) {
-    co_return hToken;
+  std::string GenerateUserJwt(std::string hToken, std::string hUserId) {
+    return hToken;
   }
 };
 
@@ -187,9 +176,8 @@ struct AlreadyPurchasedContext {
     return {Product{.kind = kinds[0], .id = ids[0]}};
   }
 
-  winrt::Windows::Foundation::IAsyncOperation<winrt::hstring> GenerateUserJwt(
-      winrt::hstring hToken, winrt::hstring hUserId) {
-    co_return hToken;
+  std::string GenerateUserJwt(std::string hToken, std::string hUserId) {
+    return hToken;
   }
 
   // noop
@@ -219,11 +207,29 @@ struct PurchaseSuccessContext {
     return {Product{.kind = kinds[0], .id = ids[0]}};
   }
 
-  winrt::Windows::Foundation::IAsyncOperation<winrt::hstring> GenerateUserJwt(
-      winrt::hstring hToken, winrt::hstring hUserId) {
-    co_return hToken;
+  std::string GenerateUserJwt(std::string hToken, std::string hUserId) {
+    return hToken;
   }
 
   // noop
   void InitDialogs(Window window) {}
 };
+
+struct TooManyUsersContext {
+  std::vector<std::string>  AllLocallyAuthenticatedUserHashes() {
+    return {"first-user", "second-user"};
+  }
+};
+
+struct NoUsers{
+  std::vector<std::string>  AllLocallyAuthenticatedUserHashes() {
+    return {};
+  }
+};
+
+struct FindOneUser{
+  static std::string goodHash;
+  std::vector<std::string>  AllLocallyAuthenticatedUserHashes() {
+    return {goodHash};
+  }
+};