Fix runtime test output suffix

Author: jderochervlk

tests/index.js

@@ -1,4 +1,5 @@
 import { execFileSync, execSync, spawnSync } from "child_process";
+import * as fs from "fs";
 import { fileURLToPath, pathToFileURL } from "url";
 import * as path from "path";
 import { exit } from "process";
@@ -7,15 +8,21 @@ const currentFileName = fileURLToPath(import.meta.url);
 const currentDir = path.dirname(currentFileName);
 const repoRoot = path.resolve(currentDir, "..");
 const testsDir = path.join(repoRoot, "tests");
+const rescriptConfig = JSON.parse(fs.readFileSync(path.join(repoRoot, "rescript.json"), "utf8"));
+const compiledSuffix = rescriptConfig.suffix ?? ".js";
 
 const runtimeTests = [
-  "FetchAPI/Headers__test.res.js",
-  "FetchAPI/Request__test.res.js",
-  "FetchAPI/Response__test.res.js",
-  "FetchAPI/URLSearchParams__test.res.js",
-  "URLAPI/URL__test.res.js",
+  "FetchAPI/Headers__test.res",
+  "FetchAPI/Request__test.res",
+  "FetchAPI/Response__test.res",
+  "FetchAPI/URLSearchParams__test.res",
+  "URLAPI/URL__test.res",
 ];
 
+const compiledRuntimeTests = runtimeTests.map((testFile) =>
+  testFile.replace(/\.res$/, compiledSuffix),
+);
+
 // Compile all tests
 execSync("npm run build", { cwd: repoRoot, stdio: "inherit" });
 
@@ -24,7 +31,7 @@ const warningYellow = "\x1b[33m";
 const errorRed = "\x1b[31m";
 const resetColor = "\x1b[0m";
 
-for (const testFile of runtimeTests) {
+for (const testFile of compiledRuntimeTests) {
   const absoluteTestFile = path.join(testsDir, testFile);
   const result = spawnSync(
     process.execPath,
@@ -54,16 +61,19 @@ for (const testFile of runtimeTests) {
 }
 
 // Assert generated test output stayed in sync.
-const gitDff = execFileSync("git", ["ls-files", "--modified", "--", "*.res.js"], {
+const gitDiff = execFileSync("git", ["ls-files", "--modified", "--", ...compiledRuntimeTests], {
   cwd: testsDir,
 }).toString();
-if (!gitDff) {
+if (!gitDiff) {
   console.log(`${successGreen}✅ No unstaged generated test difference!${resetColor}`);
   exit(0);
 } else {
   console.log(
-    `${warningYellow}⚠️ There are unstaged differences in generated tests! Did you break a test?\n${gitDff}${resetColor}`,
+    `${warningYellow}⚠️ There are unstaged differences in generated tests! Did you break a test?\n${gitDiff}${resetColor}`,
   );
-  execSync("git --no-pager diff .", { stdio: "inherit", cwd: testsDir });
+  execFileSync("git", ["--no-pager", "diff", "--", ...compiledRuntimeTests], {
+    stdio: "inherit",
+    cwd: testsDir,
+  });
   exit(1);
 }