diff --git a/test/libc/tinymath/strtod_test.c b/test/libc/tinymath/strtod_test.c
index 74b0225b3..9305663a3 100644
--- a/test/libc/tinymath/strtod_test.c
+++ b/test/libc/tinymath/strtod_test.c
@@ -38,6 +38,17 @@ static const struct {
   uint64_t i;
   const char *s;
 } V[] = {
+    {0x7FF8000000000000, "nan"},                        //
+    {0x7FF8000000000000, "NaN"},                        //
+    {0x7FF8000000000000, "NAn"},                        //
+    {0x7FF8000000000000, "nAN"},                        //
+    {0x7FF8000000000000, "NAN"},                        //
+    {0x7FF0000000000000, "INF"},                        //
+    {0x7FF0000000000000, "iNf"},                        //
+    {0x7FF8000000000000, "+NAN"},                       //
+    {0xFFF8000000000000, "-NAN"},                       //
+    {0x7FF0000000000000, "+INF"},                       //
+    {0xFFF0000000000000, "-INF"},                       //
     {0x2fa7b6d71d20b96c, "4e-079"},                     //
     {0x09eb8d7e32be6396, "7e-261"},                     //
     {0x3ae7361cb863de62, "6e-025"},                     //
@@ -85,6 +96,10 @@ static const struct {
     {0x7044d64d4079150c, "647e0230"},                   //
     {0x64a7d93193f78fc6, "755e0174"},                   //
     {0x30dcd5bee57763e6, "255e-075"},                   //
+    {0x7FF0000000000000, "INFINITY"},                   //
+    {0x7FF0000000000000, "iNfiNiTy"},                   //
+    {0x7FF0000000000000, "+INFINITY"},                  //
+    {0xFFF0000000000000, "-INFINITY"},                  //
     {0x4c159bd3ad46e346, "3391e0055"},                  //
     {0x3d923d1b5eb1d778, "4147e-015"},                  //
     {0x3b482782afe1869e, "3996e-026"},                  //