diff --git a/test/bej_common_test.cpp b/test/bej_common_test.cpp
new file mode 100644
index 0000000..09682fb
--- /dev/null
+++ b/test/bej_common_test.cpp
@@ -0,0 +1,39 @@
+#include "bej_common.h"
+
+#include <gmock/gmock-matchers.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+namespace libbej
+{
+
+TEST(BejCommonTest, BejGetUnsignedIntegerTest)
+{
+    constexpr uint8_t bytes[] = {0xab, 0xcd, 0xef, 0x12,
+                                 0x13, 0x65, 0x23, 0x89};
+    EXPECT_THAT(bejGetUnsignedInteger(bytes, /*numOfBytes=*/1), 0xab);
+    EXPECT_THAT(bejGetUnsignedInteger(bytes, /*numOfBytes=*/2), 0xcdab);
+    EXPECT_THAT(bejGetUnsignedInteger(bytes, /*numOfBytes=*/5), 0x1312efcdab);
+    EXPECT_THAT(bejGetUnsignedInteger(bytes, /*numOfBytes=*/8),
+                0x8923651312efcdab);
+}
+
+TEST(BejCommonTest, BejGetNnintTest)
+{
+    constexpr uint8_t nnint1[] = {0x03, 0xcd, 0xef, 0x12};
+    constexpr uint8_t nnint2[] = {0x08, 0xab, 0xcd, 0xef, 0x12,
+                                  0x13, 0x65, 0x23, 0x89};
+    EXPECT_THAT(bejGetNnint(nnint1), 0x12efcd);
+    EXPECT_THAT(bejGetNnint(nnint2), 0x8923651312efcdab);
+}
+
+TEST(BejCommonTest, BejGetNnintSizeTest)
+{
+    constexpr uint8_t nnint1[] = {0x03, 0xcd, 0xef, 0x12};
+    constexpr uint8_t nnint2[] = {0x08, 0xab, 0xcd, 0xef, 0x12,
+                                  0x13, 0x65, 0x23, 0x89};
+    EXPECT_THAT(bejGetNnintSize(nnint1), 4);
+    EXPECT_THAT(bejGetNnintSize(nnint2), 9);
+}
+
+} // namespace libbej