Workaround for check-cfg lint warning about cfg(test)

src/lib.rs

@@ -589,6 +589,12 @@ impl Executor for Exec {
 
 		let is_path = id.source_id().is_path();
 		let is_workspace_member;
+
+		// Temporary fix until https://github.com/rust-lang/cargo/pull/14963 arrives
+		// https://github.com/est31/cargo-udeps/issues/293
+		cmd.arg("--check-cfg");
+		cmd.arg("cfg(test)");
+
 		{
 			// TODO unwrap used
 			let mut bt = self.data.lock().unwrap();

tests/cfg-test.rs

@@ -0,0 +1,33 @@
+mod runner;
+
+use cargo::CargoResult;
+use pretty_assertions::assert_eq;
+
+use crate::runner::Runner;
+
+static CARGO_TOML :&str = r#"[workspace]
+[package]
+name = "has-test-cfg"
+version = "0.0.1"
+[dependencies]
+"#;
+
+static LIB_RS :&str = r#"
+#![deny(unexpected_cfgs)]
+#[cfg(test)]
+pub fn something_conditional() {}
+"#;
+
+#[test]
+fn cfg_test_no_unexpected_cfg() -> CargoResult<()> {
+	let (code, stdout_masked) =
+		Runner::new("cargo_udeps_cfg_test_no_unexpected_cfg")?
+			.cargo_toml(CARGO_TOML)?
+			.dir("./src")?
+			.file("./src/lib.rs", LIB_RS)?
+			.arg("--all-targets")
+			.run()?;
+	assert_eq!(0, code);
+	assert_eq!("All deps seem to have been used.\n", stdout_masked);
+	Ok(())
+}