diff --git a/tststr.cmd b/tststr.cmd
new file mode 100644
index 0000000..988a4b0
--- /dev/null
+++ b/tststr.cmd
@@ -0,0 +1,37 @@
+; Insert long environment variables [will be truncated to NSTRING - 1 (127)]
+insert-string $PATH
+newline
+; Insert string with escaped characters
+insert-string "hello, world~n"
+newline
+; Insert long quoted string [will be truncated to NSTRING - 2 (126)]
+insert-string "1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890"
+next-line
+; Insert long tokens [will be truncated to NSTRING - 1 (127)]
+insert-string 1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
+next-line
+insert-string _________1_________2_________3_________4_________5_________6_________7_________8_________9_________0_________1_________2_________3
+next-line
+; Create and insert string variable until size exceed string limit [will be truncated to NSTRING - 1 (127)
+set %nam 123
+set %expect &len %nam
+!while &equ &len %nam %expect
+    insert-string %nam
+    newline
+    set %nam &cat %nam %nam
+    set %expect &tim %expect 2
+!endwhile
+insert-string %nam
+newline
+insert-string &cat "Actual: " &len %nam
+newline
+insert-string &cat "Expected: " %expect
+newline
+; Use the variable as filename [will be truncated to NFILEN - 1 (79)]
+write-file %nam
+insert-string &cat "Filename: " $cfname
+newline
+insert-string "Filename length: "
+insert-string &len $cfname
+save-file
+beginning-of-file