Add test to ensure derives work without a direct serde dependency

Author: LukasKalbertodt

Cargo.toml

@@ -19,6 +19,11 @@ exclude = [".github"]
 name = "simple"
 required-features = ["toml"]
 
+[[test]]
+name = "indirect-serde"
+path = "tests/indirect-serde/run.rs"
+harness = false
+
 
 [features]
 default = ["toml", "yaml", "json5"]

tests/indirect-serde/.gitignore

@@ -0,0 +1 @@
+target/

tests/indirect-serde/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "indirect-serde"
+version = "0.0.0"
+edition = "2021"
+
+[dependencies]
+confique = { path = "../..", default-features = false }

tests/indirect-serde/README.md

@@ -0,0 +1,3 @@
+This is just a compile test to make sure `confique`'s derives also work when the using crate does not have `serde` in its direct dependencies.
+Having this test as separate folder with a `run.rs` calling `cargo` was the easiest way I found to do that.
+That way, this is also executed as part of `cargo test`.

tests/indirect-serde/run.rs

@@ -0,0 +1,10 @@
+use std::process::Command;
+
+fn main() {
+    let res = Command::new("cargo")
+        .args(["check"])
+        .current_dir("tests/indirect-serde")
+        .status();
+
+    assert!(res.is_ok_and(|exitcode| exitcode.success()));
+}

tests/indirect-serde/src/main.rs

@@ -0,0 +1,37 @@
+#![allow(dead_code)]
+
+use confique::Config;
+
+#[derive(Config)]
+struct Conf {
+    #[config(deserialize_with = my_deserialize_fn)]
+    username: String,
+
+    normal: u32,
+
+    opt: Option<String>,
+
+    #[config(nested)]
+    nested: Nested,
+}
+
+#[derive(Config)]
+struct Nested {
+    #[config(env = "APP_PORT")]
+    port: u16,
+
+    #[config(default = "127.0.0.1")]
+    bind: std::net::IpAddr,
+
+    #[config(default = ["x-user", "x-password"])]
+    headers: Vec<String>,
+}
+
+fn my_deserialize_fn<'de, D>(_: D) -> Result<String, D::Error>
+where
+    D: confique::serde::Deserializer<'de>,
+{
+    todo!()
+}
+
+fn main() {}