diff --git a/test/Makefile.am b/test/Makefile.am
index 62fc099..28bab29 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -26,3 +26,8 @@
 internal_fd_SOURCES = internal/fd.cpp
 internal_fd_CPPFLAGS = $(gtest_cppflags)
 internal_fd_LDADD = $(gtest_ldadd)
+
+check_PROGRAMS += utility/aspeed
+utility_aspeed_SOURCES = utility/aspeed.cpp
+utility_aspeed_CPPFLAGS = $(gtest_cppflags)
+utility_aspeed_LDADD = $(gtest_ldadd)
diff --git a/test/utility/aspeed.cpp b/test/utility/aspeed.cpp
new file mode 100644
index 0000000..90580b5
--- /dev/null
+++ b/test/utility/aspeed.cpp
@@ -0,0 +1,46 @@
+#include <gpioplus/utility/aspeed.hpp>
+#include <gtest/gtest.h>
+
+namespace gpioplus
+{
+namespace utility
+{
+namespace aspeed
+{
+namespace
+{
+
+TEST(AspeedTest, NameToOffset)
+{
+    EXPECT_EQ(5, nameToOffset("A5"));
+    EXPECT_EQ(33, nameToOffset("E1"));
+    EXPECT_EQ(202, nameToOffset("Z2"));
+    EXPECT_EQ(208, nameToOffset("AA0"));
+    EXPECT_EQ(223, nameToOffset("AB7"));
+}
+
+TEST(AspeedTest, NameToOffsetShort)
+{
+    EXPECT_THROW(nameToOffset(""), std::logic_error);
+    EXPECT_THROW(nameToOffset("A"), std::logic_error);
+    EXPECT_THROW(nameToOffset("0"), std::logic_error);
+}
+
+TEST(AspeedTest, NameToOffsetBad)
+{
+    EXPECT_THROW(nameToOffset("00"), std::logic_error);
+    EXPECT_THROW(nameToOffset("AB"), std::logic_error);
+    EXPECT_THROW(nameToOffset(".1"), std::logic_error);
+    EXPECT_THROW(nameToOffset("A#"), std::logic_error);
+}
+
+TEST(AspeedTest, NameToOffsetMaybeBad)
+{
+    EXPECT_THROW(nameToOffset("BA0"), std::logic_error);
+    EXPECT_THROW(nameToOffset("AAA0"), std::logic_error);
+}
+
+} // namespace
+} // namespace aspeed
+} // namespace utility
+} // namespace gpioplus