diff --git a/format/test/resolver.ts b/format/test/resolver.ts
new file mode 100644
index 0000000..097a01d
--- /dev/null
+++ b/format/test/resolver.ts
@@ -0,0 +1,22 @@
+import {files, fromFile} from "../lib/input";
+import {formatMessage} from "../lib/tools";
+import {validate} from "../lib/validate";
+import {Resource} from "../resolver/resource";
+
+const specs = process.argv[2];
+
+if (!specs) {
+    console.error("Usage: node resolver.js SPEC");
+    process.exit(1);
+}
+
+for (let file of files(specs, ".md")) {
+    let source = fromFile(file);
+    validate(format, file, source);
+}
+
+function format(input: string) {
+    let resource = new Resource(input);
+    let result = formatMessage(resource, new Map(), "test");
+    return JSON.stringify(result, null, 4);
+}
diff --git a/package.json b/package.json
index a132cfa..efa9a9b 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,8 @@
         "test:ebnf": "node -r esm ./syntax/test/ebnf.js ./syntax/parser/grammar.js ./syntax/spec/fluent.ebnf",
         "test:fixtures": "node -r esm ./syntax/test/parser.js ./syntax/test/fixtures",
         "test:unit": "node -r esm ./syntax/test/literals.js",
-        "test": "npm run --silent test:fixtures && npm run --silent test:unit",
+        "test:format": "node ./build/format/test/resolver.js ./format/spec/",
+        "test": "npm run --silent test:fixtures && npm run --silent test:unit && npm run --silent test:format",
         "watch": "tsc --watch"
     },
     "homepage": "https://projectfluent.org",