Default devMode to true ASAP if running Atom in test mode

Previously, we ran the window in devMode, but didn’t set devMode to true
early enough to compute the correct resource path. This caused errors
when attempting to load the bundled keymaps when running atom —test
without the —dev flag.

src/browser/atom-application.coffee

@@ -91,7 +91,7 @@ class AtomApplication
 
   openWithOptions: ({pathsToOpen, executedFrom, urlsToOpen, test, pidToKillWhenClosed, devMode, safeMode, newWindow, logFile, profileStartup, timeout}) ->
     if test
-      @runTests({headless: true, @resourcePath, executedFrom, pathsToOpen, logFile, timeout})
+      @runTests({headless: true, devMode, @resourcePath, executedFrom, pathsToOpen, logFile, timeout})
     else if pathsToOpen.length > 0
       @openPaths({pathsToOpen, executedFrom, pidToKillWhenClosed, newWindow, devMode, safeMode, profileStartup})
     else if urlsToOpen.length > 0
@@ -494,7 +494,7 @@ class AtomApplication
   #   :specPath - The directory to load specs from.
   #   :safeMode - A Boolean that, if true, won't run specs from ~/.atom/packages
   #               and ~/.atom/dev/packages, defaults to false.
-  runTests: ({headless, resourcePath, executedFrom, pathsToOpen, logFile, safeMode, timeout}) ->
+  runTests: ({headless, devMode, resourcePath, executedFrom, pathsToOpen, logFile, safeMode, timeout}) ->
     if resourcePath isnt @resourcePath and not fs.existsSync(resourcePath)
       resourcePath = @resourcePath
 
@@ -522,7 +522,6 @@ class AtomApplication
     legacyTestRunnerPath = @resolveLegacyTestRunnerPath()
     testRunnerPath = @resolveTestRunnerPath(testPaths[0])
     isSpec = true
-    devMode = true
     safeMode ?= false
     new AtomWindow({windowInitializationScript, resourcePath, headless, isSpec, devMode, testRunnerPath, legacyTestRunnerPath, testPaths, logFile, safeMode})
 

src/browser/main.coffee

@@ -133,6 +133,8 @@ parseCommandLine = ->
   if args['resource-path']
     devMode = true
     resourcePath = args['resource-path']
+
+  devMode = true if test
   resourcePath ?= devResourcePath if devMode
 
   unless fs.statSyncNoException(resourcePath)