deer: implement Deserialize for core::time

libs/deer/Cargo.toml

@@ -27,6 +27,7 @@ similar-asserts = { version = "1.4.2", features = ['serde'] }
 deer-desert = { path = "./desert", features = ['pretty'] }
 proptest = "1.1.0"
 paste = "1.0.12"
+approx = "0.5.1"
 
 [build-dependencies]
 rustc_version = "0.4.0"

libs/deer/src/impls/core.rs

@@ -10,4 +10,5 @@ mod non_zero;
 mod option;
 mod string;
 mod sync;
+mod time;
 mod unit;

libs/deer/src/impls/core/time.rs

@@ -0,0 +1,13 @@
+use core::time::Duration;
+
+use error_stack::Result;
+
+use crate::{error::DeserializeError, Deserialize, Deserializer};
+
+impl<'de> Deserialize<'de> for Duration {
+    type Reflection = <f64 as Deserialize<'de>>::Reflection;
+
+    fn deserialize<D: Deserializer<'de>>(de: D) -> Result<Self, DeserializeError> {
+        f64::deserialize(de).map(Self::from_secs_f64)
+    }
+}

libs/deer/tests/test_impls_core_time.rs

@@ -0,0 +1,17 @@
+use core::time::Duration;
+
+use approx::assert_relative_eq;
+use deer_desert::{assert_tokens_with_assertion, Token};
+use proptest::prelude::*;
+
+#[cfg(not(miri))]
+proptest! {
+    #[test]
+    fn duration_ok(value in any::<Duration>()) {
+        let input = value.as_secs_f64();
+
+        assert_tokens_with_assertion(|received: Duration| {
+            assert_relative_eq!(received.as_secs_f64(), value.as_secs_f64());
+        }, &[Token::Number(input.into())]);
+    }
+}