fix: test accounts for stderr being separated by crlf on windows.

add contrarian newlines to the long list of problems bill gates is
responsible for cursing us with on this godforsaken hellscape we call
Earth.

test-fixtures/purs-not-ok.win.txt

@@ -0,0 +1,15 @@
+Reading Spago workspace configuration...
+
+✓ Selecting package to build: aaa
+
+Downloading dependencies...
+No lockfile found, generating it...
+Lockfile written to spago.lock. Please commit this file.
+Building...
+Invalid option `--non-existent'
+
+Usage: purs COMMAND
+
+  The PureScript compiler and tools
+
+✘ purs exited with non-ok status code: Normally 1

test/Spago/Build.purs

@@ -2,8 +2,10 @@ module Test.Spago.Build where
 
 import Test.Prelude
 
+import Control.Monad.Error.Class (liftMaybe)
 import Data.Foldable (fold)
 import Data.String as String
+import Effect.Exception (error)
 import Node.FS.Aff as FSA
 import Node.Path as Path
 import Node.Platform as Platform
@@ -34,15 +36,13 @@ spec = Spec.around withTempDir do
 
     Spec.it "exits when purs exits non-ok" \{ spago, fixture } -> do
       spago [ "init", "--name", "aaa" ] >>= shouldBeSuccess
-      spago [ "build", "--purs-args", "--non-existent" ] >>=
-        checkOutputs'
-          { stdoutFile: Nothing
-          , stderrFile: Just (fixture "purs-not-ok.txt")
-          , result: isLeft
-          , sanitize: String.trim
-              >>> String.replace (String.Pattern "Usage: purs.bin") (String.Replacement "Usage: purs")
-              >>> String.replace (String.Pattern "\r\n") (String.Replacement "\n")
-          }
+      fixture' <-
+        Process.platform
+        <#> case _ of
+          Platform.Win32 -> fixture "purs-not-ok.win.txt"
+          _ -> fixture "purs-not-ok.txt"
+        # liftMaybe (error "unreachable")
+      spago [ "build", "--purs-args", "--non-existent" ] >>= shouldBeFailureErr fixture'
 
     Spec.it "passes options to purs" \{ spago } -> do
       spago [ "init" ] >>= shouldBeSuccess