Tests fails with "--no-default-features"

[siretart]

Very similar to rust-netlink/genetlink#10

$ cargo test --no-default-features
   Compiling ethtool v0.2.5 (/tmp/genetlink/ethtool)
error[E0425]: cannot find function `new_connection` in crate `ethtool`
  --> tests/dump_link_modes.rs:17:48
   |
17 |     let (connection, mut handle, _) = ethtool::new_connection().unwrap();
   |                                                ^^^^^^^^^^^^^^ not found in `ethtool`
[...]

[siretart]

These changes make the package build for me:

modified   Cargo.toml
@@ -38,6 +38,35 @@ tokio = { version = "1.0.1", features = ["rt"], optional = true}
 tokio = { version = "1.11.0", features = ["macros", "rt", "rt-multi-thread"] }
 env_logger = "0.9.0"
 
+[[example]]
+name = "dump_coalesce"
+required-features = ["tokio_socket"]
+
 [[example]]
 name = "dump_pause"
 required-features = ["tokio_socket"]
+
+[[example]]
+name = "dump_features"
+required-features = ["tokio_socket"]
+
+[[example]]
+name = "dump_link_mode"
+required-features = ["tokio_socket"]
+
+[[example]]
+name = "dump_rings"
+required-features = ["tokio_socket"]
+
+[[example]]
+name = "dump_tsinfo"
+required-features = ["tokio_socket"]
+
+[[test]]
+name = "dump_link_modes"
+required-features = ["tokio_socket"]
+
+[[test]]
+name = "get_features_lo"
+required-features = ["tokio_socket"]
+