testing: allow tests to import the same module with no custom options

vlib/compiler/tests/modules/simplemodule/importing_test.v

@@ -0,0 +1,11 @@
+import simplemodule
+
+// this tests whether the tests can import the same module without any special
+// custom paths setup on the CLI
+fn test_iadd(){
+	assert simplemodule.iadd(10, 20) == 30
+}
+
+fn test_imul(){
+	assert simplemodule.imul(5,8) == 40
+}