feat: assert_compact_pretty_json_snapshot

insta/Cargo.toml

@@ -39,6 +39,7 @@ json = ["serde"]
 ron = ["dep:ron", "serde"]
 toml = ["dep:toml", "serde"]
 yaml = ["serde"]
+json-pretty-compact = ["dep:json-pretty-compact", "dep:serde_json", "serde"]
 
 # internal feature exclusive to cargo-insta
 _cargo_insta_internal = ["clap"]
@@ -60,6 +61,8 @@ regex = { version = "1.6.0", default-features = false, optional = true, features
 serde = { version = "1.0.117", optional = true }
 once_cell = "1.20.2"
 clap = { workspace = true, optional = true }
+serde_json = { version = "1.0.145", optional = true }
+json-pretty-compact = { version = "0.1.2", optional = true }
 
 [dev-dependencies]
 rustc_version = "0.4.0"

insta/src/macros.rs

@@ -240,6 +240,15 @@ macro_rules! assert_compact_json_snapshot {
     };
 }
 
+#[cfg(feature = "json-pretty-compact")]
+#[cfg_attr(docsrs, doc(cfg(feature = "json")))]
+#[macro_export]
+macro_rules! assert_compact_pretty_json_snapshot {
+    ($($arg:tt)*) => {
+        $crate::_assert_serialized_snapshot!(format=JsonPrettyCompact, $($arg)*);
+    };
+}
+
 // This macro handles optional trailing commas.
 #[doc(hidden)]
 #[macro_export]

insta/src/serialization.rs

@@ -14,6 +14,8 @@ pub enum SerializationFormat {
     Yaml,
     Json,
     JsonCompact,
+    #[cfg(feature = "json-pretty-compact")]
+    JsonPrettyCompact,
 }
 
 #[derive(Debug)]
@@ -40,6 +42,16 @@ pub fn serialize_content(mut content: Content, format: SerializationFormat) -> S
         SerializationFormat::Yaml => yaml::to_string(&content)[4..].to_string(),
         SerializationFormat::Json => json::to_string_pretty(&content),
         SerializationFormat::JsonCompact => json::to_string_compact(&content),
+        #[cfg(feature = "json-pretty-compact")]
+        SerializationFormat::JsonPrettyCompact => {
+            let mut buf = Vec::new();
+            let mut ser = serde_json::Serializer::with_formatter(
+                &mut buf,
+                json_pretty_compact::PrettyCompactFormatter::new(),
+            );
+            content.serialize(&mut ser).unwrap();
+            String::from_utf8(buf).unwrap()
+        }
         #[cfg(feature = "csv")]
         SerializationFormat::Csv => {
             let mut buf = Vec::with_capacity(128);