Add CI lint for JSON test fixture formatting

.buildkite/pipeline.yml

@@ -42,6 +42,9 @@ steps:
 
           echo "--- :rust: Ensuring Code Conforms to rustfmt"
           make fmt-check-rust
+
+          echo "--- :json: Ensuring JSON Test Fixtures are Pretty-Printed"
+          make fmt-check-json
       - label: ":rust: Build Docs"
         command: |
           echo "--- :rust: Building Documentation"

Makefile

@@ -246,7 +246,7 @@ stop-server:
 	@# Help: Stop the running server.
 	docker-compose down
 
-lint: lint-rust lint-swift
+lint: lint-rust lint-swift fmt-check-json
 	@# Help: Run the linter for all languages.
 
 lint-rust:
@@ -264,6 +264,14 @@ lint-swift:
 
 lintfix-swift: fmt-swift
 
+fmt-json:
+	@# Help: Format all JSON test fixtures with 2-space indent.
+	@./scripts/check-json-formatting.sh --fix
+
+fmt-check-json:
+	@# Help: Check that all JSON test fixtures are pretty-printed.
+	@./scripts/check-json-formatting.sh
+
 fmt-rust:
 	$(rust_docker_run) /bin/bash -c "rustup component add rustfmt && cargo fmt"
 

scripts/check-json-formatting.sh

@@ -0,0 +1,46 @@
+#!/bin/bash
+#
+# Check that JSON test fixtures are pretty-printed (2-space indent via jq).
+# Usage:
+#   ./scripts/check-json-formatting.sh          # check mode (exit 1 on failure)
+#   ./scripts/check-json-formatting.sh --fix    # rewrite files in place
+
+set -euo pipefail
+
+fix=false
+if [[ "${1:-}" == "--fix" ]]; then
+    fix=true
+fi
+
+failed=false
+
+while IFS= read -r -d '' file; do
+    # Strip BOM if present — jq handles it, but we want consistent output
+    contents=$(sed '1s/^\xef\xbb\xbf//' "$file")
+
+    formatted=$(echo "$contents" | jq .) || {
+        echo "Invalid JSON: $file"
+        failed=true
+        continue
+    }
+
+    actual=$(cat "$file")
+    if [[ "$actual" != "$formatted" ]]; then
+        if $fix; then
+            echo "$formatted" > "$file"
+            echo "Fixed: $file"
+        else
+            echo "Not properly formatted: $file"
+            failed=true
+        fi
+    fi
+done < <(find wp_api/tests test-data -name '*.json' -print0 | sort -z)
+
+if $failed; then
+    echo
+    echo "Some JSON files are not properly formatted."
+    echo "Run 'make fmt-json' to fix them."
+    exit 1
+elif ! $fix; then
+    echo "All JSON test fixtures are properly formatted."
+fi

test-data/api-details/test-case-01.json

@@ -1,4 +1,4 @@
-{
+{
   "name": "Site with BOM",
   "description": "Site with BOM",
   "url": "https://example.com",