implement --no-only flag functionality

.eslintrc

@@ -17,12 +17,13 @@
         "no-magic-numbers": "off",
         "max-lines": "warn",
         "max-lines-per-function": "warn",
-        "max-statements": "warn",
         "max-statements-per-line": [2, { "max": 2 }],
+        "max-statements": "warn",
         "multiline-comment-style": "off",
         "no-negated-condition": "off",
-        "no-use-before-define": "warn",
         "no-underscore-dangle": "warn",
+        "no-use-before-define": "warn",
+        "object-curly-newline": "off",
         "sort-keys": "warn",
     },
     "ignorePatterns": ["syntax-error.*"],

bin/tape

@@ -8,9 +8,14 @@ var objectKeys = require('object-keys');
 var opts = parseOpts(process.argv.slice(2), {
     alias: { r: 'require', i: 'ignore' },
     string: ['require', 'ignore'],
-    default: { r: [], i: null }
+    boolean: ['only'],
+    default: { r: [], i: null, only: null }
 });
 
+if (typeof opts.only === 'boolean') {
+    process.env.NODE_TAPE_NO_ONLY_TEST = !opts.only;
+}
+
 var cwd = process.cwd();
 
 if (typeof opts.require === 'string') {

index.js

@@ -66,7 +66,8 @@ module.exports = (function () {
 function createExitHarness(conf, wait) {
     var config = conf || {};
     var harness = createHarness({
-        autoclose: defined(config.autoclose, false)
+        autoclose: defined(config.autoclose, false),
+        noOnly: defined(conf.noOnly, defined(process.env.NODE_TAPE_NO_ONLY_TEST, false))
     });
     var running = false;
     var ended = false;
@@ -163,6 +164,7 @@ function createHarness(conf_) {
     var only = false;
     test.only = function () {
         if (only) { throw new Error('there can only be one only test'); }
+        if (conf_.noOnly) { throw new Error('`only` tests are prohibited'); }
         only = true;
         var t = test.apply(null, arguments);
         results.only(t);

readme.markdown

@@ -144,6 +144,41 @@ By default, uncaught exceptions in your tests will not be intercepted, and will
 - In-process reporting with https://github.com/DavidAnson/tape-player
 - Describe blocks with https://github.com/mattriley/tape-describe
 
+# command-line flags
+
+While running tests, top-level configurations can be passed via the command line to specify desired behavior.
+
+Available configurations are listed below:
+
+## --require
+
+**Alias**: `-r`
+
+This is used to load modules before running tests and is explained extensively in the [preloading modules](#preloading-modules) section.
+
+## --ignore
+
+**Alias**: `-i`
+
+This flag is used when tests from certain folders and/or files are not intended to be run. It defaults to `.gitignore` file when passed with no argument.
+
+```sh
+tape -i .ignore **/*.js
+```
+
+An error is thrown if the specified file passed as argument does not exist.
+
+## --no-only
+This is particularly useful in a CI environment where an [only test](#testonlyname-opts-cb) is not supposed to go unnoticed.
+
+By passing the `--no-only` flag, any existing [only test](#testonlyname-opts-cb) causes tests to fail.
+
+```sh
+tape --no-only **/*.js
+```
+
+Alternatively, the environment variable `NODE_TAPE_NO_ONLY_TEST` can be set to `true` to achieve the same behavior; the command-line flag takes precedence.
+
 # methods
 
 The assertion methods in `tape` are heavily influenced or copied from the methods in [node-tap](https://github.com/isaacs/node-tap).
@@ -362,6 +397,8 @@ By default the TAP output goes to `console.log()`. You can pipe the output to so
 
 Like `test([name], [opts], cb)` except if you use `.only` this is the only test case that will run for the entire process, all other test cases using `tape` will be ignored.
 
+Check out how the usage of [the --no-only flag](#--no-only) could help ensure there is no `.only` test running in a specified environment.
+
 ## var stream = test.createStream(opts)
 
 Create a stream of output, bypassing the default output stream that writes messages to `console.log()`. By default `stream` will be a text stream of TAP output, but you can get an object stream instead by setting `opts.objectMode` to `true`.

test/no_only.js

@@ -0,0 +1,110 @@
+'use strict';
+
+var tap = require('tap');
+var path = require('path');
+var exec = require('child_process').exec;
+
+var stripFullStack = require('./common').stripFullStack;
+
+var tapeBin = path.join(__dirname, '../bin/tape');
+
+var expectedExitCodeFailure = (/^0\.10\.\d+$/).test(process.versions.node);
+var expectedStackTraceBug = (/^3\.[012]\.\d+$/).test(process.versions.node); // https://github.com/nodejs/node/issues/2581
+
+tap.test(
+    'Should throw error when --no-only is passed via cli and there is a .only test',
+    { todo: expectedExitCodeFailure || expectedStackTraceBug ? 'Fails on these node versions' : false },
+    function (tt) {
+        tt.plan(3);
+
+        exec(tapeBin + ' --no-only "**/*.js"', {
+            cwd: path.join(__dirname, 'no_only')
+        }, function (err, stdout, stderr) {
+            tt.same(stdout.toString('utf8'), '');
+            tt.match(stripFullStack(stderr.toString('utf8')).join('\n'), /Error: `only` tests are prohibited\n/);
+            tt.equal(err.code, 1);
+        });
+    }
+);
+
+tap.test(
+    'Should throw error when NODE_TAPE_NO_ONLY_TEST is passed via envs and there is an .only test',
+    { todo: expectedExitCodeFailure || expectedStackTraceBug ? 'Fails on these node versions' : false },
+    function (tt) {
+        tt.plan(3);
+
+        exec(tapeBin + ' "**/*.js"', {
+            cwd: path.join(__dirname, 'no_only'),
+            env: { PATH: process.env.PATH, NODE_TAPE_NO_ONLY_TEST: 'true' }
+        }, function (err, stdout, stderr) {
+            tt.same(stdout.toString('utf8'), '');
+            tt.match(stripFullStack(stderr.toString('utf8')).join('\n'), /Error: `only` tests are prohibited\n/);
+            tt.equal(err.code, 1);
+        });
+    }
+);
+
+tap.test(
+    'Should override NODE_TAPE_NO_ONLY_TEST env if --no-only is passed from cli',
+    { todo: expectedExitCodeFailure || expectedStackTraceBug ? 'Fails on these node versions' : false },
+    function (tt) {
+        tt.plan(3);
+
+        exec(tapeBin + ' --no-only "**/*.js"', {
+            cwd: path.join(__dirname, 'no_only'),
+            env: { PATH: process.env.PATH, NODE_TAPE_NO_ONLY_TEST: 'false' }
+        }, function (err, stdout, stderr) {
+            tt.same(stdout.toString('utf8'), '');
+            tt.match(stripFullStack(stderr.toString('utf8')).join('\n'), /Error: `only` tests are prohibited\n/);
+            tt.equal(err.code, 1);
+        });
+    }
+);
+
+tap.test('Should run successfully if there is no only test', function (tt) {
+    tt.plan(3);
+
+    exec(tapeBin + ' --no-only "**/test-a.js"', {
+        cwd: path.join(__dirname, 'no_only')
+    }, function (err, stdout, stderr) {
+        tt.match(stderr.toString('utf8'), /^\s*(\(node:\d+\) ExperimentalWarning: The ESM module loader is experimental\.)?\s*$/);
+        tt.same(stripFullStack(stdout.toString('utf8')), [
+            'TAP version 13',
+            '# should pass',
+            'ok 1 should be truthy',
+            '',
+            '1..1',
+            '# tests 1',
+            '# pass  1',
+            '',
+            '# ok',
+            '',
+            ''
+        ]);
+        tt.equal(err, null); // code 0
+    });
+});
+
+tap.test('Should run successfully if there is an only test and no --no-only flag', function (tt) {
+    tt.plan(3);
+
+    exec(tapeBin + ' "**/test-b.js"', {
+        cwd: path.join(__dirname, 'no_only')
+    }, function (err, stdout, stderr) {
+        tt.same(stripFullStack(stdout.toString('utf8')), [
+            'TAP version 13',
+            '# should pass again',
+            'ok 1 should be truthy',
+            '',
+            '1..1',
+            '# tests 1',
+            '# pass  1',
+            '',
+            '# ok',
+            '',
+            ''
+        ]);
+        tt.match(stderr.toString('utf8'), /^\s*(\(node:\d+\) ExperimentalWarning: The ESM module loader is experimental\.)?\s*$/);
+        tt.equal(err, null); // code 0
+    });
+});

test/no_only/test-a.js

@@ -0,0 +1,8 @@
+'use strict';
+
+var tape = require('../../');
+
+tape.test('should pass', function (t) {
+    t.plan(1);
+    t.ok(1);
+});

test/no_only/test-b.js

@@ -0,0 +1,14 @@
+'use strict';
+
+var tape = require('../../');
+
+tape.test('should pass', function (t) {
+    t.plan(1);
+    t.ok(1);
+});
+
+tape.test.only('should pass again', function (t) {
+    t.plan(1);
+    t.ok(1);
+});
+