diff --git a/test/test_addition.c b/test/test_addition.c
index 08b668b..876c32f 100644
--- a/test/test_addition.c
+++ b/test/test_addition.c
@@ -316,4 +316,23 @@ void test_addition_precision_double_numbers(void)
     TEST_ASSERT_EQUAL_UINT64(expected[4], result[4]);
 }
 
+void test_addition_exponent_double_numbers(void)
+{
+    unsigned long long result[5];
+    numberd[0].dnum = 830046503435461000, numberd[1].dnum = -906056810308432, numberd[2].dnum = 0.5315020335035034357, numberd[3].dnum = -34, numberd[4].dnum = 94315454312021310;
+    unsigned long long expected[5] = { (numberd[0].lnum << 1) >> 53 , (numberd[1].lnum << 1) >> 53, (numberd[2].lnum << 1) >> 53, (numberd[3].lnum << 1) >> 53, (numberd[4].lnum << 1) >> 53};
+
+    result[0] = exponent_double( numberd[0].lnum );
+    result[1] = exponent_double( numberd[1].lnum );
+    result[2] = exponent_double( numberd[2].lnum );
+    result[3] = exponent_double( numberd[3].lnum );
+    result[4] = exponent_double( numberd[4].lnum );
+
+    TEST_ASSERT_EQUAL_UINT64(expected[0], result[0]);
+    TEST_ASSERT_EQUAL_UINT64(expected[1], result[1]);
+    TEST_ASSERT_EQUAL_UINT64(expected[2], result[2]);
+    TEST_ASSERT_EQUAL_UINT64(expected[3], result[3]);
+    TEST_ASSERT_EQUAL_UINT64(expected[4], result[4]);
+}
+
 #endif // TEST