tests do not work with --no-default-features

[ignatenkobrain]

⋊> ~/t/config-rs on master ◦ cargo test --no-default-features --no-fail-fast                                                                                                                               16:08:20
   Compiling config v0.9.0 (file:///home/brain/tmp/config-rs)
error[E0599]: no variant named `Toml` found for type `config::FileFormat` in the current scope
 --> tests/merge.rs:7:41
  |
7 |     c.merge(File::new("tests/Settings", FileFormat::Toml))
  |                                         ^^^^^^^^^^^^^^^^ variant not found in `config::FileFormat`

error[E0599]: no variant named `Toml` found for type `config::FileFormat` in the current scope
 --> tests/errors.rs:7:41
  |
7 |     c.merge(File::new("tests/Settings", FileFormat::Toml))
  |                                         ^^^^^^^^^^^^^^^^ variant not found in `config::FileFormat`

error[E0599]: no variant named `Json` found for type `config::FileFormat` in the current scope
  --> tests/datetime.rs:15:13
   |
15 |             FileFormat::Json,
   |             ^^^^^^^^^^^^^^^^ variant not found in `config::FileFormat`

error[E0599]: no variant named `Yaml` found for type `config::FileFormat` in the current scope
 --> tests/file.rs:8:53
  |
8 |     let res = c.merge(File::new("tests/NoSettings", FileFormat::Yaml).required(false));
  |                                                     ^^^^^^^^^^^^^^^^ variant not found in `config::FileFormat`

error[E0599]: no variant named `Yaml` found for type `config::FileFormat` in the current scope
  --> tests/file.rs:16:53
   |
16 |     let res = c.merge(File::new("tests/NoSettings", FileFormat::Yaml));
   |                                                     ^^^^^^^^^^^^^^^^ variant not found in `config::FileFormat`

error[E0599]: no variant named `Toml` found for type `config::FileFormat` in the current scope
  --> tests/errors.rs:16:59
   |
16 |     let res = c.merge(File::new("tests/Settings-invalid", FileFormat::Toml));
   |                                                           ^^^^^^^^^^^^^^^^ variant not found in `config::FileFormat`

error[E0599]: no variant named `Yaml` found for type `config::FileFormat` in the current scope
  --> tests/datetime.rs:22:13
   |
22 |             FileFormat::Yaml,
   |             ^^^^^^^^^^^^^^^^ variant not found in `config::FileFormat`

error[E0599]: no variant named `Toml` found for type `config::FileFormat` in the current scope
  --> tests/datetime.rs:29:13
   |
29 |             FileFormat::Toml,
   |             ^^^^^^^^^^^^^^^^ variant not found in `config::FileFormat`

error[E0599]: no variant named `Hjson` found for type `config::FileFormat` in the current scope
  --> tests/datetime.rs:38:13
   |
38 |             FileFormat::Hjson,
   |             ^^^^^^^^^^^^^^^^^ variant not found in `config::FileFormat`

error[E0599]: no variant named `Toml` found for type `config::FileFormat` in the current scope
  --> tests/merge.rs:10:52
   |
10 |     c.merge(File::new("tests/Settings-production", FileFormat::Toml))
   |                                                    ^^^^^^^^^^^^^^^^ variant not found in `config::FileFormat`

error[E0599]: no variant named `Ini` found for type `config::FileFormat` in the current scope
  --> tests/datetime.rs:45:13
   |
45 |             FileFormat::Ini,
   |             ^^^^^^^^^^^^^^^ variant not found in `config::FileFormat`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0599`.
error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0599`.
error: Could not compile `config`.
warning: build failed, waiting for other jobs to finish...
error: Could not compile `config`.
warning: build failed, waiting for other jobs to finish...
error: aborting due to 5 previous errors

For more information about this error, try `rustc --explain E0599`.
error: Could not compile `config`.
warning: build failed, waiting for other jobs to finish...
error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0599`.
error: Could not compile `config`.
warning: build failed, waiting for other jobs to finish...
error[E0599]: no variant named `Hjson` found for type `config::FileFormat` in the current scope
  --> tests/file_hjson.rs:35:41
   |
35 |     c.merge(File::new("tests/Settings", FileFormat::Hjson))
   |                                         ^^^^^^^^^^^^^^^^^ variant not found in `config::FileFormat`

error[E0599]: no variant named `Ini` found for type `config::FileFormat` in the current scope
  --> tests/file_ini.rs:28:41
   |
28 |     c.merge(File::new("tests/Settings", FileFormat::Ini))
   |                                         ^^^^^^^^^^^^^^^ variant not found in `config::FileFormat`

error[E0599]: no variant named `Ini` found for type `config::FileFormat` in the current scope
  --> tests/file_ini.rs:56:59
   |
56 |     let res = c.merge(File::new("tests/Settings-invalid", FileFormat::Ini));
   |                                                           ^^^^^^^^^^^^^^^ variant not found in `config::FileFormat`

error[E0599]: no variant named `Hjson` found for type `config::FileFormat` in the current scope
  --> tests/file_hjson.rs:68:59
   |
68 |     let res = c.merge(File::new("tests/Settings-invalid", FileFormat::Hjson));
   |                                                           ^^^^^^^^^^^^^^^^^ variant not found in `config::FileFormat`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0599`.
error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0599`.
error[E0599]: no variant named `Toml` found for type `config::FileFormat` in the current scope
  --> tests/get.rs:32:41
   |
32 |     c.merge(File::new("tests/Settings", FileFormat::Toml))
   |                                         ^^^^^^^^^^^^^^^^ variant not found in `config::FileFormat`

error: Could not compile `config`.
warning: build failed, waiting for other jobs to finish...
error: Could not compile `config`.
warning: build failed, waiting for other jobs to finish...
error[E0599]: no variant named `Toml` found for type `config::FileFormat` in the current scope
  --> tests/file_toml.rs:43:41
   |
43 |     c.merge(File::new("tests/Settings", FileFormat::Toml))
   |                                         ^^^^^^^^^^^^^^^^ variant not found in `config::FileFormat`

error[E0599]: no variant named `Toml` found for type `config::FileFormat` in the current scope
  --> tests/file_toml.rs:78:59
   |
78 |     let res = c.merge(File::new("tests/Settings-invalid", FileFormat::Toml));
   |                                                           ^^^^^^^^^^^^^^^^ variant not found in `config::FileFormat`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0599`.
error: Could not compile `config`.
warning: build failed, waiting for other jobs to finish...
error: aborting due to previous error

For more information about this error, try `rustc --explain E0599`.
error: Could not compile `config`.

To learn more, run the command again with --verbose.

It would be nice if you could guard those tests by #[cfg()]

[mehcode]

Fixed it for now. Definitely could use better core test coverage.