Add cram test for YAML witness unrolled loop invariant (issue #1225)

tests/regression/55-loop-unrolling/10-unrolled-loop-invariant.c

@@ -0,0 +1,6 @@
+int main() {
+  int i = 0;
+  while (i < 10)
+    i++;
+  return 0;
+}

tests/regression/55-loop-unrolling/10-unrolled-loop-invariant.t

@@ -0,0 +1,25 @@
+  $ goblint --set lib.activated '[]' --set exp.unrolling-factor 5 --enable ana.int.interval --enable witness.yaml.enabled 10-unrolled-loop-invariant.c
+  [Info] unrolling loop at 10-unrolled-loop-invariant.c:3:3-4:8 with factor 5
+  [Info][Deadcode] Logical lines of code (LLoC) summary:
+    live: 5
+    dead: 0
+    total lines: 5
+  [Warning][Deadcode][CWE-571] condition 'i < 10' (possibly inserted by CIL) is always true (10-unrolled-loop-invariant.c:3:10-3:16)
+  [Warning][Deadcode][CWE-571] condition 'i < 10' (possibly inserted by CIL) is always true (10-unrolled-loop-invariant.c:3:10-3:16)
+  [Warning][Deadcode][CWE-571] condition 'i < 10' (possibly inserted by CIL) is always true (10-unrolled-loop-invariant.c:3:10-3:16)
+  [Warning][Deadcode][CWE-571] condition 'i < 10' (possibly inserted by CIL) is always true (10-unrolled-loop-invariant.c:3:10-3:16)
+  [Warning][Deadcode][CWE-571] condition 'i < 10' (possibly inserted by CIL) is always true (10-unrolled-loop-invariant.c:3:10-3:16)
+  [Info][Witness] witness generation summary:
+    total generation entries: 4
+
+  $ cat witness.yml | grep -A 1 'value:'
+        value: (((((5 <= i && i <= 9) || i == 4) || i == 3) || i == 2) || i == 1) ||
+          i == 0
+  --
+        value: i == 10
+        format: c_expression
+  --
+        value: (((((5 <= i && i <= 10) || i == 4) || i == 3) || i == 2) || i == 1) ||
+          i == 0
+
+