diff --git a/.gitignore b/.gitignore
index 1716bff91d9d..7f734090b0db 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,4 +13,5 @@ tmp/
 coverage
 .nyc_output
 travis-keys.sh
-ccxt.wiki/
\ No newline at end of file
+ccxt.wiki/
+markets.json
\ No newline at end of file
diff --git a/.npmignore b/.npmignore
index 1716bff91d9d..7f734090b0db 100644
--- a/.npmignore
+++ b/.npmignore
@@ -13,4 +13,5 @@ tmp/
 coverage
 .nyc_output
 travis-keys.sh
-ccxt.wiki/
\ No newline at end of file
+ccxt.wiki/
+markets.json
\ No newline at end of file
diff --git a/run-tests.js b/run-tests.js
new file mode 100644
index 000000000000..f98f6f772833
--- /dev/null
+++ b/run-tests.js
@@ -0,0 +1,128 @@
+"use strict";
+
+/*  ---------------------------------------------------------------------------
+
+    A tests launcher. Runs tests for all languages and all markets, in
+    parallel, with a humanized error reporting.
+
+    Usage: node run-tests [--php] [--js] [--python] [--es6] [market] [symbol]
+
+    --------------------------------------------------------------------------- */
+
+const fs = require ('fs')
+const log = require ('ololog').configure ({ indent: { pattern: '  ' }})
+const ansi = require ('ansicolor').nice
+
+/*  --------------------------------------------------------------------------- */
+
+process.on ('uncaughtException',  e => { log.bright.red.error (e); process.exit (1) })
+process.on ('unhandledRejection', e => { log.bright.red.error (e); process.exit (1) })
+
+/*  --------------------------------------------------------------------------- */
+
+const [,, ...args] = process.argv
+
+const keys = {
+
+    '--js': false,      // run JavaScript tests only
+    '--php': false,     // run PHP tests only
+    '--python': false,  // run Python tests only
+    '--es6': false,     // run JS tests against ccxt.js instead of ccxt.es5.js (no need to `npm run build` before)
+}
+
+let markets = []
+let symbol = 'all'
+
+for (const arg of args) {
+    if (arg.startsWith ('--'))   { keys[arg] = true }
+    else if (arg.includes ('/')) { symbol = arg }
+    else                         { markets.push (arg) }
+}
+
+/*  --------------------------------------------------------------------------- */
+
+if (!markets.length) {
+
+    if (!fs.existsSync ('markets.json')) {
+
+        log.bright.red ('\n\tNo', 'markets.json'.white, 'found, please run', 'npm run build'.white, 'to generate it!\n')
+        process.exit (1)
+    }
+
+    markets = JSON.parse (fs.readFileSync ('markets.json')).ids
+}
+
+/*  --------------------------------------------------------------------------- */
+
+const sleep = ms => new Promise (resolve => setTimeout (resolve, ms))
+const timeout = (ms, promise) => Promise.race ([ promise, sleep (ms).then (() => { throw new Error ('timed out') }) ])
+
+/*  --------------------------------------------------------------------------- */
+
+const exec = (bin, ...args) =>
+
+/*  A custom version of child_process.exec that captures both stdout and
+    stderr,  not separating them into distinct buffers — so that we can show
+    the same output as if it were running in a terminal.                        */
+
+    new Promise (return_ => {
+
+        const ps = require ('child_process').spawn (bin, args)
+
+        let output = ''
+        let hasErrorOutput = false
+
+        ps.stdout.on ('data', data => { output += data.toString () })
+        ps.stderr.on ('data', data => { output += data.toString (); hasErrorOutput = true })
+
+        ps.on ('exit', code => { return_ ({ failed: code !== 0, output, hasErrorOutput }) })
+    })
+
+/*  ------------------------------------------------------------------------ */
+
+const testMarket = async (market) => {
+
+/*  Run tests for all languages (in parallel)     */
+
+    const tests = await Promise.all ([
+
+                            { language: 'JavaScript', exec: ['node',      'test.js',  market] },
+                            { language: 'Python',     exec: ['python',    'test.py',  market] },
+                            { language: 'PHP',        exec: ['php', '-f', 'test.php', market] }
+
+                        ].map (test => exec (...test.exec)
+                                      .then (result => Object.assign (test, result))))
+
+    const anyFailed = tests.find (test => test.failed)
+
+/*  Print log output    */
+
+    log.bright ('Testing', market.cyan, anyFailed ? 'FAILED'.bgBrightRed : 'OK'.green)
+
+    for (const { language, failed, output, hasErrorOutput } of tests) {
+
+        if (failed || hasErrorOutput) {
+
+            log.indent (1) ('\n', language.bright[failed ? 'bgBrightRed' : 'bgBrightYellow'], '\n')
+            log.indent (2) (output)
+        }
+    }
+
+    if (anyFailed) {
+        process.exit (1)
+    }
+}
+
+/*  ------------------------------------------------------------------------ */
+
+(async function () {
+
+    log.bright.magenta.noPretty ('Testing'.white, { markets, symbol, keys })
+
+    await Promise.all (markets.map (testMarket))
+
+    log.bright.bgGreen ('\nALL OK')
+
+}) ();
+
+/*  ------------------------------------------------------------------------ */
\ No newline at end of file