lib: fix bug with huge test output

lib/package-manager/test.js

@@ -52,7 +52,9 @@ function test(packageManager, context, next) {
     const options = createOptions(wd, context);
     let nodeBin = 'node';
     if (context.options.testPath) {
-      options.env.PATH = `${context.options.testPath}${envSeparator}${process.env.PATH}`;
+      options.env.PATH = `${context.options.testPath}${envSeparator}${
+        process.env.PATH
+      }`;
       nodeBin = which(nodeBinName, {
         path: options.env.PATH || process.env.PATH
       });

lib/reporter/logger.js

@@ -1,24 +1,44 @@
 'use strict';
-const _ = require('lodash');
 const chalk = require('chalk');
 
 const util = require('./util');
 
+const outChunkSize = 10000;
+
 function logModule(log, logType, module) {
   log[logType](chalk.yellow('module name:'), module.name);
   if (!module.skipped) {
     log[logType](chalk.yellow('version:'), module.version);
   }
   if (module.error) {
     log[logType]('error:', module.error.message);
-    log[logType]('error:', module.testOutput);
+    // If the output is not too big, just print it.
+    if (module.testOutput.length < outChunkSize) {
+      log[logType]('error:', module.testOutput);
+      return;
+    }
+    // If the output is too big the log formatter explodes, so we slice.
+    for (let i = 0; i < module.testOutput.length; ) {
+      // Slice the output to `outChunkSize` size chunks,
+      // from `i` to `i + outChunkSize`, and update `i`.
+      const rawChunk = module.testOutput.substring(i, (i += outChunkSize));
+      // Align chunk to the last EOL:
+      // 1. Search for last EOL.
+      const lastEOL = rawChunk.lastIndexOf('\n') + 1;
+      // 2.1. If EOL found, trim the chunk of what comes after `lastEOL`.
+      const chunk = lastEOL > 0 ? rawChunk.substring(0, lastEOL) : rawChunk;
+      // 2.2. And push back `i` to `lastEOL`, but relative to original size.
+      if (lastEOL > 0) {
+        const eolDistanceFromEndOfChunk = outChunkSize - lastEOL;
+        i -= eolDistanceFromEndOfChunk;
+      }
+      log[logType]('error:', chunk);
+    }
   }
 }
 
 function logModules(log, logType, modules) {
-  _.each(modules, (module) => {
-    logModule(log, logType, module);
-  });
+  modules.forEach((module) => logModule(log, logType, module));
 }
 
 function logger(log, modules) {

lib/spawn.js

@@ -3,8 +3,13 @@ const child = require('child_process');
 
 function spawn(cmd, args, options) {
   if (process.platform === 'win32') {
-    args = ['/c', cmd].concat(args);
-    cmd = 'cmd';
+    if (cmd.endsWith('js')) {
+      args = [cmd].concat(args);
+      cmd = process.execPath;
+    } else {
+      args = ['/c', cmd].concat(args);
+      cmd = 'cmd';
+    }
   }
   return child.spawn(cmd, args, options);
 }