1 files changed, 81 insertions, 0 deletions
diff --git a/third_party/rust/serde_json/tests/debug.rs b/third_party/rust/serde_json/tests/debug.rs
new file mode 100644
index 0000000000..8ddcf5a381
--- /dev/null
+++ b/third_party/rust/serde_json/tests/debug.rs
@@ -0,0 +1,81 @@
+use indoc::indoc;
+use serde_json::{json, Number, Value};
+
+#[test]
+fn number() {
+    assert_eq!(format!("{:?}", Number::from(1)), "Number(1)");
+    assert_eq!(format!("{:?}", Number::from(-1)), "Number(-1)");
+    assert_eq!(
+        format!("{:?}", Number::from_f64(1.0).unwrap()),
+        "Number(1.0)"
+    );
+}
+
+#[test]
+fn value_null() {
+    assert_eq!(format!("{:?}", json!(null)), "Null");
+}
+
+#[test]
+fn value_bool() {
+    assert_eq!(format!("{:?}", json!(true)), "Bool(true)");
+    assert_eq!(format!("{:?}", json!(false)), "Bool(false)");
+}
+
+#[test]
+fn value_number() {
+    assert_eq!(format!("{:?}", json!(1)), "Number(1)");
+    assert_eq!(format!("{:?}", json!(-1)), "Number(-1)");
+    assert_eq!(format!("{:?}", json!(1.0)), "Number(1.0)");
+    assert_eq!(Number::from_f64(1.0).unwrap().to_string(), "1.0"); // not just "1"
+    assert_eq!(Number::from_f64(12e40).unwrap().to_string(), "1.2e41");
+}
+
+#[test]
+fn value_string() {
+    assert_eq!(format!("{:?}", json!("s")), "String(\"s\")");
+}
+
+#[test]
+fn value_array() {
+    assert_eq!(format!("{:?}", json!([])), "Array []");
+}
+
+#[test]
+fn value_object() {
+    assert_eq!(format!("{:?}", json!({})), "Object {}");
+}
+
+#[test]
+fn error() {
+    let err = serde_json::from_str::<Value>("{0}").unwrap_err();
+    let expected = "Error(\"key must be a string\", line: 1, column: 2)";
+    assert_eq!(format!("{:?}", err), expected);
+}
+
+#[test]
+fn indented() {
+    let j = json!({
+        "Array": [true],
+        "Bool": true,
+        "EmptyArray": [],
+        "EmptyObject": {},
+        "Null": null,
+        "Number": 1,
+        "String": "...",
+    });
+    let expected = indoc! {r#"
+        Object {
+            "Array": Array [
+                Bool(true),
+            ],
+            "Bool": Bool(true),
+            "EmptyArray": Array [],
+            "EmptyObject": Object {},
+            "Null": Null,
+            "Number": Number(1),
+            "String": String("..."),
+        }"#
+    };
+    assert_eq!(format!("{:#?}", j), expected);
+}