Create automatic test script

README.md

@@ -8,3 +8,9 @@ ECN lab about syntaxic analysis
 make
 ./eval
 ```
+
+## How to test
+
+```
+./test.sh
+```

ans.txt

@@ -0,0 +1,4 @@
+3
+-1
+7
+6

test.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+echo "Program output :"
+cat test.txt | ./eval.out
+echo "Expected output :"
+cat ans.txt

test.txt

@@ -0,0 +1,6 @@
+1+2
+=
+1-2=
+1+2*3
+=
+1+2+3=