test: add small sudoku solver to test the CDCL(T) interface

tests/Makefile

@@ -6,3 +6,10 @@ test-icnf:
 		diff regression/.`basename $$i`.out regression/.`basename $$i`.ref \
 		  || ( echo "mismatch for $$i" ; exit 1) ; \
 	 done
+
+
+test-sudoku:
+	@for i in sudoku/sudoku.txt ; do \
+	  	echo "test problem $$i"; \
+		./../src/sudoku/sudoku_solve.exe $$i ; \
+	done

tests/dune

@@ -17,3 +17,7 @@
  (deps    ./icnf-solve/icnf_solve.exe Makefile (source_tree regression))
  (action  (run make test-icnf)))
 
+(alias
+ (name    runtest)
+ (deps    ./../src/sudoku/sudoku_solve.exe Makefile (source_tree sudoku))
+ (action  (run make test-sudoku)))