Try out cram/prysk for CLI integration testing (vercel#1829)

Add some `prysk`-based integration tests. They're minimal for now, but we can expand them as we work on CLI UX. 

This PR also fixes an incorrect error that was printed out from `turbo logout`, found via CLI test.

These are not yet wired to CI. I'd like to let them bake for a bit to make sure they are useful before we start gating releases on them. They can be run via `make integration-tests` in the `cli` package.

[Prysk](https://github.com/Nicoretti/prysk)

.editorconfig

@@ -9,6 +9,9 @@ indent_style = space
 insert_final_newline = true
 trim_trailing_whitespace = true
 
+[*.t]
+trim_trailing_whitespace = false
+
 [Makefile]
 indent_style = tab
 

cli/.gitignore

@@ -9,4 +9,5 @@
 /turbo-new.exe
 /turbo.exe
 
-/scripts/turbo-*
+/scripts/turbo-*
+/.cram_env

cli/Makefile

@@ -166,3 +166,16 @@ clean-build:
 clean-demo:
 	rm -rf node_modules
 	rm -rf demo
+
+CRAM_ENV := .cram_env
+
+$(CRAM_ENV)/bin/pip:
+	python3 -m venv $(CRAM_ENV)
+
+$(CRAM_ENV)/bin/prysk: $(CRAM_ENV)/bin/pip
+	$(CRAM_ENV)/bin/pip install prysk
+
+INTEGRATION_TEST_FILES = $(shell find integration_tests -name "*.t")
+
+integration-tests: $(CRAM_ENV)/bin/prysk turbo $(INTEGRATION_TEST_FILES)
+	$(CRAM_ENV)/bin/prysk $(INTEGRATION_TEST_FILES)

cli/integration_tests/logged_in.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+read -r -d '' CONFIG <<- EOF
+{
+  "token": "normal-user-token"
+}
+EOF
+
+USER_CONFIG_HOME=$(mktemp -d -t turbo-XXXXXXXXXX)
+# duplicate over to XDG var so that turbo picks it up
+export XDG_CONFIG_HOME=$USER_CONFIG_HOME
+
+mkdir -p $USER_CONFIG_HOME/turborepo
+echo $CONFIG > $USER_CONFIG_HOME/turborepo/config.json

cli/integration_tests/logout.t

@@ -0,0 +1,12 @@
+Setup
+  $ . ${TESTDIR}/setup.sh
+  $ . ${TESTDIR}/logged_in.sh
+
+Logout while logged in
+  $ ${TURBO} logout
+  >>> Logged out
+
+Logout while logged out
+  $ ${TURBO} logout
+  >>> Logged out
+

cli/integration_tests/setup.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+TURBO=${TESTDIR}/../turbo

cli/integration_tests/turbo_help.t

@@ -0,0 +1,31 @@
+Setup
+  $ . ${TESTDIR}/setup.sh
+
+Test help flag
+  $ ${TURBO} -h
+  Usage: turbo [--version] [--help] <command> [<args>]
+
+  Available commands are:
+      bin       Get the path to the Turbo binary
+      daemon    Runs turbod
+      link      Link your local directory to a Vercel organization and enable remote caching.
+      login     Login to your Vercel account
+      logout    Logout of your Vercel account
+      prune     Prepare a subset of your monorepo.
+      run       Run tasks across projects in your monorepo
+      unlink    Unlink the current directory from your Vercel organization and disable Remote Caching
+
+
+  $ ${TURBO} --help
+  Usage: turbo [--version] [--help] <command> [<args>]
+
+  Available commands are:
+      bin       Get the path to the Turbo binary
+      daemon    Runs turbod
+      link      Link your local directory to a Vercel organization and enable remote caching.
+      login     Login to your Vercel account
+      logout    Logout of your Vercel account
+      prune     Prepare a subset of your monorepo.
+      run       Run tasks across projects in your monorepo
+      unlink    Unlink the current directory from your Vercel organization and disable Remote Caching
+

cli/integration_tests/turbo_version.t

@@ -0,0 +1,10 @@
+Setup
+  $ . ${TESTDIR}/setup.sh
+
+Test version
+  $ ${TURBO} --version
+  (?P<major>0|[1-9]\d*)\.(?P<minor>0|[1-9]\d*)\.(?P<patch>0|[1-9]\d*)(?:-(?P<prerelease>(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+(?P<buildmetadata>[0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$ (re)
+
+Semver Regex source: https://semver.org/#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string
+TODO: resolve ambiguity
+$ ${TURBO} -v

cli/internal/cmd/auth/logout.go

@@ -3,6 +3,7 @@ package auth
 import (
 	"errors"
 	"fmt"
+	"os"
 
 	"github.com/fatih/color"
 	"github.com/vercel/turborepo/cli/internal/config"
@@ -66,7 +67,7 @@ func LogoutCmd(ch *LogoutCommand) *cobra.Command {
 		Use:   "logout",
 		Short: "Logout of your Vercel account",
 		RunE: func(cmd *cobra.Command, args []string) error {
-			if err := ch.Config.UserConfig.Delete(); err != nil {
+			if err := ch.Config.UserConfig.Delete(); err != nil && !os.IsNotExist(err) {
 				return ch.logError("could not logout. Something went wrong: %w", err)
 			}