diff --git a/.eslintrc b/.eslintrc
index 235361f5..429f72f2 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -45,6 +45,10 @@
             "allow": []
         }],
         "no-undef": "error",
+        "no-unused-vars": ["error", {
+            "vars": "all",
+            "args": "after-used"
+        }],
         "no-useless-escape": "error",
         "object-curly-newline": ["error", {
             "ObjectExpression": {
diff --git a/index.js b/index.js
index 10200482..386e16b6 100644
--- a/index.js
+++ b/index.js
@@ -107,6 +107,8 @@ function createExitHarness(conf, wait) {
         var stream = harness.createStream({ objectMode: config.objectMode });
         var es = stream.pipe(config.stream || createDefaultStream());
         if (canEmitExit) {
+            // TODO: use `err` arg?
+            // eslint-disable-next-line no-unused-vars
             es.on('error', function (err) { harness._exitCode = 1; });
         }
         stream.on('end', function () { ended = true; });
diff --git a/lib/test.js b/lib/test.js
index 71325f52..31275195 100644
--- a/lib/test.js
+++ b/lib/test.js
@@ -33,6 +33,7 @@ var safeClearTimeout = clearTimeout;
 
 inherits(Test, EventEmitter);
 
+// eslint-disable-next-line no-unused-vars
 var getTestArgs = function (name_, opts_, cb_) {
     var name = '(anonymous)';
     var opts = {};
@@ -744,6 +745,7 @@ Test.prototype.doesNotMatch = function doesNotMatch(string, regexp, msg, extra)
     });
 };
 
+// eslint-disable-next-line no-unused-vars
 Test.skip = function skip(name_, _opts, _cb) {
     var args = getTestArgs.apply(null, arguments);
     args.opts.skip = true;
diff --git a/test/import.js b/test/import.js
index b76e5bc9..e2581e75 100644
--- a/test/import.js
+++ b/test/import.js
@@ -92,7 +92,7 @@ tap.test('errors importing test files', function (t) {
             var message = options.error + ' in `' + options.mode + '` mode`';
             var ps = tape(options.files, { env: { NODE_OPTIONS: '--unhandled-rejections=' + options.mode } });
             ps.stderr.pipe(concat(options.unhandledRejection(message)));
-            ps.on('exit', function (code, sig) {
+            ps.on('exit', function (code/* , sig */) {
                 t.equal(code, options.exitCode, message + ' has exit code ' + options.exitCode);
             });
         };
@@ -191,8 +191,7 @@ tap.test('errors importing test files', function (t) {
 function tape(args, options) {
     options = assign({ cwd: __dirname }, options);
 
-    var proc = require('child_process');
     var bin = __dirname + '/../bin/tape';
 
-    return proc.spawn('node', [bin].concat(args.split(' ')), options);
+    return spawn('node', [bin].concat(args.split(' ')), options);
 }
diff --git a/test/promises/fail.js b/test/promises/fail.js
index 6ffb3f8d..5047c0b9 100644
--- a/test/promises/fail.js
+++ b/test/promises/fail.js
@@ -3,7 +3,7 @@
 var test = require('../../');
 
 if (typeof Promise === 'function' && typeof Promise.resolve === 'function') {
-    test('promise', function (t) {
+    test('promise', function () {
         return new Promise(function (resolve, reject) {
             reject(new Error('rejection message'));
         });
diff --git a/test/require.js b/test/require.js
index d0c7c813..14014cdd 100644
--- a/test/require.js
+++ b/test/require.js
@@ -64,8 +64,7 @@ tap.test('requiring multiple modules', function (t) {
 });
 
 function tape(args) {
-    var proc = require('child_process');
     var bin = __dirname + '/../bin/tape';
 
-    return proc.spawn('node', [bin].concat(args.split(' ')), { cwd: __dirname });
+    return spawn('node', [bin].concat(args.split(' ')), { cwd: __dirname });
 }
diff --git a/test/skip.js b/test/skip.js
index 7a1523de..d0843599 100644
--- a/test/skip.js
+++ b/test/skip.js
@@ -1,7 +1,6 @@
 'use strict';
 
 var test = require('../');
-var ran = 0;
 
 var concat = require('concat-stream');
 var tap = require('tap');
@@ -32,18 +31,15 @@ tap.test('test SKIP comment', function (assert) {
 
 test('skip this', { skip: true }, function (t) {
     t.fail('this should not even run');
-    ran++;
     t.end();
 });
 
 test.skip('skip this too', function (t) {
     t.fail('this should not even run');
-    ran++;
     t.end();
 });
 
 test('skip subtest', function (t) {
-    ran++;
     t.test('skip this', { skip: true }, function (st) {
         st.fail('this should not even run');
         st.end();