Mist package test

mist-test/src/common/package.mist

@@ -0,0 +1,3 @@
+pub module common;
+
+pub fn test_package() {}

mist-test/src/main.mist

@@ -1,5 +1,6 @@
 fn main() {
     println!("running common tests...");
+    common::test_package();
     common::expr_test::run_tests();
     common::statement_test::run_tests();
     common::decl_test::run_tests();