From 322a6e3537ee24d58d9601cae9500a9be1f65dae Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Tue, 21 Jun 2022 09:26:18 +0200
Subject: Add tests for loading sources

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
---
 src/config.rs | 28 ++++++++++++++++++++++++++++
 src/source.rs | 30 ++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+)

diff --git a/src/config.rs b/src/config.rs
index d9b5a64..6d581d1 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -128,3 +128,31 @@ impl<'a> ConfigBuilder<'a> {
     }
 }
 
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::element::AsConfigElement;
+
+    #[test]
+    fn test_compile_loading() {
+        let _c = Config::builder()
+            .load(&crate::source::test_source::TestSource(|| ConfigElement::Null))
+            .unwrap()
+            .build();
+    }
+
+    #[test]
+    #[cfg(feature = "json")]
+    fn test_load_json() {
+        let json: serde_json::Value = serde_json::from_str(r#"
+            { "key": "value" }
+        "#).unwrap();
+        let json = std::sync::Arc::new(json);
+
+        let _c = Config::builder()
+            .load(&crate::source::test_source::TestSource(|| json.as_config_element().unwrap()))
+            .unwrap()
+            .build();
+    }
+
+}
diff --git a/src/source.rs b/src/source.rs
index d3ff323..485da8a 100644
--- a/src/source.rs
+++ b/src/source.rs
@@ -5,3 +5,33 @@ pub trait ConfigSource: std::fmt::Debug {
 
     fn load<'a>(&'a self) -> Result<ConfigObject<'a>, Self::Error>;
 }
+
+
+#[cfg(test)]
+pub(crate) mod test_source {
+    use crate::source::ConfigSource;
+    use crate::object::ConfigObject;
+    use crate::element::ConfigElement;
+    use crate::description::ConfigSourceDescription;
+
+    pub(crate) struct TestSource<'a, G>(pub(crate) G)
+        where G: Fn() -> ConfigElement<'a>;
+
+    impl<'g, G> std::fmt::Debug for TestSource<'g, G>
+        where G: Fn() -> ConfigElement<'g>
+    {
+        fn fmt(&self, _: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+            Ok(())
+        }
+    }
+
+    impl<'g, G> ConfigSource for TestSource<'g, G>
+        where G: Fn() -> ConfigElement<'g>
+    {
+        type Error = std::convert::Infallible; // can never happen
+
+        fn load<'a>(&'a self) -> Result<ConfigObject<'a>, Self::Error> {
+            Ok(ConfigObject::new(self.0(), ConfigSourceDescription::Unknown))
+        }
+    }
+}
-- 
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