test: integration tests for imports

extension/examples/valid/imports/mutliFunc.wacc

@@ -0,0 +1,27 @@
+# import sum, main from ../sum.wacc
+
+# Output:
+# 15
+# -33
+# 0
+# 0
+#
+
+# Exit:
+# 0
+
+# Program:
+
+import "../sum.wacc" (sum, main as sumMain)
+
+begin
+  int main() is 
+    int result = call sum(-10, -23) ;
+    println result ;
+    return 0
+  end
+  int result1 = call sumMain() ;
+  int result2 = call main() ;
+  println result1 ;
+  println result2
+end