Move shell tests into Cargo feature

Cargo.toml

@@ -25,10 +25,29 @@ tempfile = "3.1.0"
 [target.'cfg(windows)'.dependencies]
 rand = "0.7.3"
 
-[target.'cfg(unix)'.dev-dependencies]
+[dev-dependencies]
 assert_cmd = "1.0.1"
 seq-macro = "0.2.1"
 
+[features]
+default = []
+# Adds tests for code generated by `zoxide init`.
+# This requires the following external programs available in $PATH:
+# - bash
+# - black: <https://github.com/psf/black>
+# - dash
+# - fish: <https://github.com/fish-shell/fish-shell>
+# - mypy: <https://github.com/python/mypy>
+# - powershell: <https://github.com/PowerShell/PowerShell>
+# - pylint: <https://github.com/PyCQA/pylint>
+# - shellcheck: <https://github.com/koalaman/shellcheck>
+# - shfmt: <https://github.com/mvdan/sh>
+# - xonsh: <https://github.com/xonsh/xonsh>
+# - zsh: <https://github.com/zsh-users/zsh>
+# Since most users are unlikely to have installed all of the above, these tests
+# are disabled by default.
+shell_tests = []
+
 [profile.release]
 codegen-units = 1
 lto = true

src/shell.rs

@@ -37,7 +37,7 @@ pub enum Hook {
     Pwd,
 }
 
-#[cfg(unix)]
+#[cfg(feature = "shell_tests")]
 #[cfg(test)]
 mod tests {
     use super::*;