test: exit in error if kind2 is not installed

salut/test/ring-orientation/verify.lus

@@ -24,5 +24,5 @@ let
   worst_case_is_tigth = (round_nb >= worst_case-1) => legitimate;
   ok =
     -- closure is wrong because legitimate needs to be more specific (cf state.lus)
-    converge_worst_case ; -- closure and;
+    closure and converge_worst_case ; -- closure and;
 tel;
\ No newline at end of file

salut/test/run-kind2.sh

@@ -15,7 +15,7 @@ where:
   - n is the size of the topology [1]
   - property is one of the verify node variable (in verify.lus) (ok by default)
   - daemon is in {synchronous,distributed,central,locally_central}  (distributed by default)
-  - int is in {int, int8, uint8, int16, uint16, ..., uinit64} [2] (int by default)
+  - int is in {int, int8, uint8, int16, uint16, ..., uinit64} [2] (int8+ by default)
   - solver is in {Z3, Bitwuzla, cvc5, MathSAT, Yices, Yices2} [3] (Bitwuzla by default)
 
 example of use (that are equivalent because of the default values):
@@ -40,6 +40,8 @@ nb: '$0 file_name_unknown_to_gg 5' works if 'file_name_unknown_to_gg5.dot' exist
 [3] cf kind2 documentation
 "
 
+kind2 --version || { echo "kind2 is not installed. try: opam install kind2" ; exit 2; }
+
 #### Dealing with CL arguments
 # at least 2 arguments are required
   if [[ $# < 2 ]]