test: integration tests for imports

extension/examples/valid/imports/alias.wacc

@@ -0,0 +1,22 @@
+# import main from ../sum.wacc and ./basic.wacc
+
+# Output:
+# 15
+# 0
+# -33
+#
+
+# Exit:
+# 0
+
+# Program:
+
+import "../sum.wacc" (main as sumMain)
+import "./basic.wacc" (main)
+
+begin
+  int result1 = call sumMain() ;
+  int result2 = call main() ;
+  println result1 ;
+  println result2
+end