update test to demonstrate include_str!() is failing for generated data

examples/env_locations/main.rs

@@ -3,9 +3,10 @@ fn test() {
     // our source file should be readable
     let source_file = std::fs::read_to_string(env!("SOURCE_FILE")).unwrap();
     assert_eq!(source_file, "source\n");
-    // our generated data file should be readable
+    // our generated data file should be readable at run time and build time
     let generated_data = std::fs::read_to_string(env!("GENERATED_DATA")).unwrap();
-    assert_eq!(generated_data, "hello\n");
+    let generated_data2 = include_str!(env!("GENERATED_DATA"));
+    assert_eq!(generated_data, generated_data2);
     // and we should be able to read (and thus execute) our tool
     assert_eq!(std::fs::read(env!("SOME_TOOL")).unwrap().is_empty(), false);
 }