Simplify test gulpfile and improve test order visibility

test/gulpfile.ts

@@ -31,18 +31,9 @@ const install = () => {
 
 const cleanAll = () => Promise.resolve();
 
-const test = () => {
-  // run mocha tests matching a glob with a pre-required fixture,
-  // returning the associated gulp stream
-  if (!semver.satisfies(process.version, '>=10.10.0')) {
-    console.log(`Skipping cross-implementation tests for Node ${process.version}`);
-    return Promise.resolve();
-  }
-  const apiTestGlob = `${apiTestDir}/*.js`;
-  const runTestsWithFixture = (server, client) => new Promise((resolve, reject) => {
+const runTestsWithFixture = (server, client) => () => new Promise((resolve, reject) => {
   const fixture = `${server}_${client}`;
-    console.log(`Running ${apiTestGlob} with ${server} server + ${client} client`);
-    gulp.src(apiTestGlob)
+  gulp.src(`${apiTestDir}/*.js`)
     .pipe(mocha({
       reporter: 'mocha-jenkins-reporter',
       require: [`${testDir}/fixtures/${fixture}.js`]
@@ -51,23 +42,20 @@ const test = () => {
     .on('end', resolve)
     .on('error', reject);
 });
-  var runTestsArgPairs;
-  if (semver.satisfies(process.version, '^8.13.0 || >=10.10.0')) {
-    runTestsArgPairs = [
-      ['native', 'native'],
-      ['native', 'js'],
-      ['js', 'native'],
-      ['js', 'js']
-    ];
-  } else {
-    runTestsArgPairs = [
-      ['native', 'native']
-    ];
-  }
-  return runTestsArgPairs.reduce((previousPromise, argPair) => {
-    return previousPromise.then(runTestsWithFixture.bind(null, argPair[0], argPair[1]));
-  }, Promise.resolve());
-};
+
+const testNativeClientNativeServer = runTestsWithFixture('native', 'native');
+const testJsClientNativeServer = runTestsWithFixture('native', 'js');
+const testNativeClientJsServer = runTestsWithFixture('js', 'native');
+const testJsClientJsServer = runTestsWithFixture('js', 'js');
+
+const test = semver.satisfies(process.version, '^8.13.0 || >=10.10.0') ?
+             gulp.series(
+               testNativeClientNativeServer,
+               testJsClientNativeServer,
+               testNativeClientJsServer,
+               testJsClientJsServer
+              ) :
+             testNativeClientNativeServer;
 
 export {
   install,