1 files changed, 56 insertions, 0 deletions
diff --git a/src/tests/mod.rs b/src/tests/mod.rs
new file mode 100644
index 0000000..58cd2b0
--- /dev/null
+++ b/src/tests/mod.rs
@@ -0,0 +1,56 @@
+use crate::Configuration;
+use std::collections::HashSet;
+
+mod parsing;
+
+fn check_configs_equal(
+	cfg1: &Configuration,
+	cfg2: &Configuration,
+) -> Result<(), Box<dyn std::error::Error>> {
+	fn check_configs_equal_at(
+		cfg1: &Configuration,
+		cfg2: &Configuration,
+		prefix: &str,
+	) -> Result<(), Box<dyn std::error::Error>> {
+		let (keys1, keys2): (HashSet<&str>, HashSet<&str>) =
+			if let Some(k) = prefix.strip_suffix('.') {
+				(cfg1.subkeys(k).collect(), cfg2.subkeys(k).collect())
+			} else {
+				(cfg1.keys().collect(), cfg2.keys().collect())
+			};
+		for key in keys1.difference(&keys2) {
+			return Err(format!(
+				"Key {prefix}{key} appears at {}, but not in other configuration",
+				cfg1.location(&format!("{prefix}{key}")).unwrap()
+			)
+			.into());
+		}
+		for key in keys2.difference(&keys1) {
+			return Err(format!(
+				"Key {prefix}{key} appears at {}, but not in other configuration",
+				cfg2.location(&format!("{prefix}{key}")).unwrap()
+			)
+			.into());
+		}
+		for key in &keys1 {
+			let full_key = format!("{prefix}{key}");
+			let val1 = cfg1.get(&full_key);
+			let val2 = cfg2.get(&full_key);
+			if val1 != val2 {
+				return Err(format!(
+					"Mismatch between values for key {full_key}
+    defined as {val1:?} at {},
+but defined as {val2:?} at {}",
+					cfg1.location(&full_key)
+						.map_or("<nowhere>".into(), |x| format!("{x}")),
+					cfg2.location(&full_key)
+						.map_or("<nowhere>".into(), |x| format!("{x}")),
+				)
+				.into());
+			}
+			check_configs_equal_at(cfg1, cfg2, &format!("{full_key}."))?;
+		}
+		Ok(())
+	}
+	check_configs_equal_at(cfg1, cfg2, "")
+}