Fixed out-of-order problems in the automated unit tests

src/nimble.nim

@@ -596,9 +596,9 @@ proc downloadPkg(pkg: Package, verRange: VersionRangeRef): string =
 proc install(packages: seq[PkgTuple],
              options: Options,
              doPrompt = true): tuple[paths: seq[string], pkg: PackageInfo] =
-  if packages == @[]:
+ if packages == @[]:
     result = installFromDir(getCurrentDir(), false, options, "")
-  else:
+ else:
     # If packages.json is not present ask the user if they want to download it.
     if not existsFile(options.getNimbleDir / "packages.json"):
       if doPrompt and

src/nimblepkg/tools.nim

@@ -9,8 +9,13 @@ proc doCmd*(cmd: string) =
   let bin = cmd.split(' ')[0]
   if findExe(bin) == "":
     raise newException(NimbleError, "'" & bin & "' not in PATH.")
+
+  # To keep output in sequence
+  stdout.flushFile()
+  stderr.flushFile()
 
   let exitCode = execCmd(cmd)
+
   if exitCode != QuitSuccess:
     raise newException(NimbleError,
         "Execution failed with exit code " & $exitCode)

tests/tester.nim

@@ -1,6 +1,6 @@
 # Copyright (C) Dominik Picheta. All rights reserved.
 # BSD License. Look at license.txt for more info.
-import osproc, unittest, strutils, os, sequtils, future
+import osproc, streams, unittest, strutils, os, sequtils, future
 
 const path = "../src/nimble"
 
@@ -15,6 +15,35 @@ template cd*(dir: string, body: stmt) =
   body
   setCurrentDir(lastDir)
 
+proc execCmdEx2*(command: string, options: set[ProcessOption] = {
+                poUsePath}): tuple[
+                output: TaintedString,
+                error: TaintedString,
+                exitCode: int] {.tags: [ExecIOEffect, ReadIOEffect], gcsafe.} =
+  ## A slightly altered version of osproc.execCmdEx
+  ## Runs the `command` and returns the standard output, error output, and
+  ## exit code.
+  var p = startProcess(command = command, options = options + {poEvalCommand})
+  var outp = outputStream(p)
+  var errp = errorStream(p)
+  result = (TaintedString"", TaintedString"", -1)
+  var outLine = newStringOfCap(120).TaintedString
+  var errLine = newStringOfCap(120).TaintedString
+  while true:
+    var checkForExit = true
+    if outp.readLine(outLine):
+      result[0].string.add(outLine.string)
+      result[0].string.add("\n")
+      checkForExit = false
+    if errp.readLine(errLine):
+      result[1].string.add(errLine.string)
+      result[1].string.add("\n")
+      checkForExit = false
+    if checkForExit:
+      result[2] = peekExitCode(p)
+      if result[2] != -1: break
+  close(p)
+
 proc processOutput(output: string): seq[string] =
   output.strip.splitLines().filter((x: string) => (x.len > 0))
 
@@ -24,11 +53,11 @@ test "can install packagebin2":
       QuitSuccess
 
 test "can reject same version dependencies":
-  let (outp, exitCode) = execCmdEx(path &
+  let (outp, errp, exitCode) = execCmdEx2(path &
       " install -y https://github.com/nimble-test/packagebin.git")
-  #echo outp
-  # TODO: outp is not in the correct order.
-  let ls = outp.strip.splitLines()
+  # We look at the error output here to avoid out-of-order problems caused by
+  # stderr output being generated and flushed without first flushing stdout
+  let ls = errp.strip.splitLines()
   check exitCode != QuitSuccess
   check ls[ls.len-1] == "Error: unhandled exception: Cannot satisfy the " &
       "dependency on PackageA 0.2.0 and PackageA 0.5.0 [NimbleError]"
@@ -50,8 +79,9 @@ test "issue #27":
 
 test "can uninstall":
   block:
-    let (outp, exitCode) = execCmdEx(path & " uninstall -y issue27b")
-    let ls = outp.processOutput()
+    let (outp, errp, exitCode) = execCmdEx2(path & " uninstall -y issue27b")
+    # let ls = outp.processOutput()
+    let ls = errp.strip.splitLines()
     check exitCode != QuitSuccess
     check ls[ls.len-1] == "  Cannot uninstall issue27b (0.1.0) because " &
                           "issue27a (0.1.0) depends on it [NimbleError]"
@@ -62,9 +92,9 @@ test "can uninstall":
   # Remove Package*
   check execCmdEx(path & " uninstall -y PackageA@0.5").exitCode == QuitSuccess
 
-  let (outp, exitCode) = execCmdEx(path & " uninstall -y PackageA")
+  let (outp, errp, exitCode) = execCmdEx2(path & " uninstall -y PackageA")
   check exitCode != QuitSuccess
-  let ls = outp.processOutput()
+  let ls = errp.processOutput()
   check ls[ls.len-2].startsWith("  Cannot uninstall PackageA ")
   check ls[ls.len-1].startsWith("  Cannot uninstall PackageA ")
   check execCmdEx(path & " uninstall -y PackageBin2").exitCode == QuitSuccess