diff --git a/test/BUILD.gn b/test/BUILD.gn
index b33d1eb0a3a9..72e926c2efb6 100644
--- a/test/BUILD.gn
+++ b/test/BUILD.gn
@@ -89,6 +89,7 @@ test("brave_unit_tests") {
     sources += [
       "//brave/vendor/bat-native-ledger/src/bat_get_media_unittest.cc",
       "//brave/vendor/bat-native-ledger/src/bat_helper_unittest.cc",
+      "//brave/vendor/bat-native-ledger/src/bat_publishers_unittest.cc",
       "//brave/vendor/bat-native-ledger/src/test/niceware_partial_unittest.cc",
       "//brave/components/brave_rewards/browser/publisher_info_database_unittest.cc",
       "//brave/vendor/bat-native-usermodel/test/usermodel_unittest.cc",
diff --git a/vendor/bat-native-ledger/src/bat_publishers.h b/vendor/bat-native-ledger/src/bat_publishers.h
index 19ce29d455cc..506772c92d8d 100644
--- a/vendor/bat-native-ledger/src/bat_publishers.h
+++ b/vendor/bat-native-ledger/src/bat_publishers.h
@@ -15,6 +15,7 @@
 #include "bat/ledger/ledger_callback_handler.h"
 #include "bat/ledger/publisher_info.h"
 #include "bat_helper.h"
+#include "base/gtest_prod_util.h"
 
 namespace bat_ledger {
 class LedgerImpl;
@@ -26,6 +27,8 @@ struct PUBLISHER_STATE_ST;
 
 namespace braveledger_bat_publishers {
 
+// FORWARD_DECLARE_TEST(BatPublishersTest, calcScoreConsts);
+
 class BatPublishers : public ledger::LedgerCallbackHandler {
  public:
 
@@ -132,7 +135,8 @@ class BatPublishers : public ledger::LedgerCallbackHandler {
   bool isVerified(const std::string& publisher_id);
 
  private:
-
+  friend class BatPublishersTest;
+  FRIEND_TEST_ALL_PREFIXES(BatPublishersTest, calcScoreConsts);
   void onPublisherActivitySave(uint64_t windowId,
                                const ledger::VisitData& visit_data,
                                ledger::Result result,
diff --git a/vendor/bat-native-ledger/src/bat_publishers_unittest.cc b/vendor/bat-native-ledger/src/bat_publishers_unittest.cc
new file mode 100644
index 000000000000..622593875425
--- /dev/null
+++ b/vendor/bat-native-ledger/src/bat_publishers_unittest.cc
@@ -0,0 +1,26 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this file,
+* You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "bat/ledger/ledger.h"
+#include "bat_publishers.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+// npm run test -- brave_unit_tests --filter=BatPublishersTest.*
+
+class BatPublishersTest : public testing::Test {
+};
+
+TEST_F(BatPublishersTest, calcScoreConsts) {
+  braveledger_bat_publishers::BatPublishers* publishers =
+      new braveledger_bat_publishers::BatPublishers(nullptr);
+
+  // Test 8 seconds
+  publishers->calcScoreConsts(8);
+
+  ASSERT_EQ(publishers->a_, 7000);
+  ASSERT_EQ(publishers->a2_, 14000);
+  ASSERT_EQ(publishers->a4_, 28000);
+  ASSERT_EQ(publishers->b_, 1000);
+  ASSERT_EQ(publishers->b2_, 1000000);
+}