1 files changed, 25 insertions, 7 deletions
diff --git a/tests/wpt/wpt.ts b/tests/wpt/wpt.ts
index c42ff51e6..b13a10cf4 100755
--- a/tests/wpt/wpt.ts
+++ b/tests/wpt/wpt.ts
@@ -18,6 +18,7 @@ import {
   checkPy3Available,
   escapeLoneSurrogates,
   Expectation,
+  EXPECTATION_PATH,
   generateRunInfo,
   getExpectation,
   getExpectFailForCase,
@@ -30,6 +31,7 @@ import {
   noIgnore,
   quiet,
   rest,
+  runGitDiff,
   runPy,
   updateManifest,
   wptreport,
@@ -256,7 +258,16 @@ async function run() {
     await Deno.writeTextFile(wptreport, JSON.stringify(report) + "\n");
   }
 
+  const newExpectations = newExpectation(results);
+  const tmp = Deno.makeTempFileSync();
+  saveExpectation(newExpectations, tmp);
+
   const code = reportFinal(results, endTime - startTime);
+
+  // Run git diff to see what changed
+  await runGitDiff([EXPECTATION_PATH, tmp]);
+  Deno.removeSync(tmp);
+
   Deno.exit(code);
 }
 
@@ -390,6 +401,19 @@ async function update() {
     await Deno.writeTextFile(json, JSON.stringify(results) + "\n");
   }
 
+  const newExpectations = newExpectation(results);
+  saveExpectation(newExpectations);
+
+  reportFinal(results, endTime - startTime);
+
+  console.log(blue("Updated expectation.json to match reality."));
+
+  Deno.exit(0);
+}
+
+function newExpectation(
+  results: { test: TestToRun; result: TestResult }[],
+): Expectation {
   const resultTests: Record<
     string,
     { passed: string[]; failed: string[]; testSucceeded: boolean }
@@ -431,13 +455,7 @@ async function update() {
     );
   }
 
-  saveExpectation(currentExpectation);
-
-  reportFinal(results, endTime - startTime);
-
-  console.log(blue("Updated expectation.json to match reality."));
-
-  Deno.exit(0);
+  return currentExpectation;
 }
 
 function insertExpectation(