add formatter tests

src/tests/formatter.rs

@@ -0,0 +1,33 @@
+use std::{env, fs::{self, Permissions}, os::unix::fs::PermissionsExt};
+
+use crate::modules::formatter::BashFormatter;
+
+fn create_fake_binary(fmt: BashFormatter) {
+    let body = if cfg!(unix) {
+        "#!/usr/bin/env bash\nexit 0"
+    } else {
+        panic!("this test is not available for non-unix platforms")
+    };
+
+    let name: String = fmt.as_cmd();
+
+    fs::write(&name, body).expect("Couldn't write fake script");
+    fs::set_permissions(&name, Permissions::from_mode(0o755)).expect("Couldn't set perms for fake script");
+}
+
+#[test]
+fn all_exist() {
+    let path = env::var("PATH").expect("Cannot get $PATH");
+
+    env::set_var("PATH", format!("{path}:./")); // temporary unset to ensure that shfmt exists in $PATH
+    let fmts = BashFormatter::get_all();
+    for fmt in fmts {
+        create_fake_binary(fmt);
+        assert_eq!(fmt.is_available(), true);
+        assert_eq!(BashFormatter::get_available().is_some(), true);
+        fs::remove_file(fmt.as_cmd::<String>()).expect("Couldn't remove formatter's fake binary");
+    }
+
+    env::set_var("PATH", &path);
+    assert_eq!(env::var("PATH").expect("Cannot get $PATH"), path);
+}

src/tests/mod.rs

@@ -1 +1,2 @@
+pub mod formatter;
 pub mod validity;