feat(data): Add IntoJson

crates/snapbox/Cargo.toml

@@ -46,7 +46,7 @@ examples = ["dep:escargot"]
 regex = ["dep:regex"]
 
 ## Snapshotting of json
-json = ["structured-data", "dep:serde_json"]
+json = ["structured-data", "dep:serde_json", "dep:serde"]
 ## Snapshotting of term styling
 term-svg = ["structured-data", "dep:anstyle-svg"]
 ## Snapshotting of structured data
@@ -97,6 +97,7 @@ document-features = { version = "0.2.6", optional = true }
 serde_json = { version = "1.0.85", optional = true}
 anstyle-svg = { version = "0.1.3", optional = true }
 regex = { version = "1.10.4", optional = true, default-features = false, features = ["std"] }
+serde = { version = "1.0.198", optional = true }
 
 [target.'cfg(windows)'.dependencies]
 windows-sys = { version = "0.52.0", features = ["Win32_Foundation"], optional = true }

crates/snapbox/src/data/mod.rs

@@ -42,6 +42,35 @@ impl<D: std::fmt::Debug> ToDebug for D {
     }
 }
 
+/// Capture the serde representation of a value
+///
+/// ```rust,no_run
+/// use snapbox::IntoJson as _;
+///
+/// fn some_function() -> usize {
+///     // ...
+/// # 5
+/// }
+///
+/// let actual = some_function();
+/// let expected = snapbox::str![["5"]];
+/// snapbox::assert_eq(actual.into_json(), expected);
+/// ```
+#[cfg(feature = "json")]
+pub trait IntoJson {
+    fn into_json(self) -> Data;
+}
+
+#[cfg(feature = "json")]
+impl<S: serde::Serialize> IntoJson for S {
+    fn into_json(self) -> Data {
+        match serde_json::to_value(self) {
+            Ok(value) => Data::json(value),
+            Err(err) => Data::error(err.to_string(), DataFormat::Json),
+        }
+    }
+}
+
 /// Convert to [`Data`] with modifiers for `expected` data
 pub trait IntoData: Sized {
     /// Remove default [`filters`][crate::filters] from this `expected` result
@@ -215,7 +244,9 @@ pub(crate) enum DataInner {
 /// See also
 /// - [`str!`] for inline snapshots
 /// - [`file!`] for external snapshots
+/// - [`ToString`] for verifying a `Display` representation
 /// - [`ToDebug`] for verifying a debug representation
+/// - [`IntoJson`] for verifying the serde representation
 /// - [`IntoData`] for modifying `expected`
 impl Data {
     /// Mark the data as binary (no post-processing)

crates/snapbox/src/lib.rs

@@ -113,6 +113,8 @@ pub use action::DEFAULT_ACTION_ENV;
 pub use assert::Assert;
 pub use data::Data;
 pub use data::IntoData;
+#[cfg(feature = "json")]
+pub use data::IntoJson;
 pub use data::ToDebug;
 pub use error::Error;
 pub use filters::Redactions;
@@ -123,6 +125,8 @@ pub type Result<T, E = Error> = std::result::Result<T, E>;
 /// Easier access to common traits
 pub mod prelude {
     pub use crate::IntoData;
+    #[cfg(feature = "json")]
+    pub use crate::IntoJson;
     pub use crate::ToDebug;
 }