make.bat: Makefile-like test functionality for Windows

Add make.bat which has the same test functionality as the Makefile.

Makes it easier to run tests from the command prompt on Windows
platforms.

make.bat

@@ -0,0 +1,98 @@
+@echo off
+setlocal
+
+set _EXITCODE=0
+
+REM If no target is provided, default to test.
+if [%1]==[] goto test
+
+set _TARGETS=generate,test,testacc,testrace,updatedeps,vet
+
+REM Run target.
+for %%a in (%_TARGETS%) do (if x%1==x%%a goto %%a)
+goto usage
+
+REM generate runs `go generate` to build the dynamically generated
+REM source files.
+:generate
+	go generate ./...
+	goto :eof
+
+REM test runs the unit tests and vets the code.
+:test
+	call :testsetup
+	go test %_TEST% %TESTARGS% -timeout=30s -parallel=4
+	call :setMaxExitCode %ERRORLEVEL%
+	echo.
+	goto vet
+
+REM testacc runs acceptance tests.
+:testacc
+	call :testsetup
+	if x%_TEST% == x./... goto testacc_fail
+	if x%_TEST% == x.\... goto testacc_fail
+	set TF_ACC=1
+	go test %_TEST% -v %TESTARGS% -timeout 45m
+	exit /b %ERRORLEVEL%
+:testacc_fail
+	echo ERROR: Set TEST to a specific package.
+	exit /b 1
+
+REM testrace runs the race checker.
+:testrace
+	call :testsetup
+	go test -race %_TEST% %TESTARGS%
+	exit /b %ERRORLEVEL%
+
+REM testsetup calls `go generate` and defines the variables TF_ACC
+REM and _TEST. TF_ACC is always cleared. _TEST defaults to the value
+REM of the TEST environment variable, provided that TEST is defined,
+REM otherwise _TEST it is set to "./...".
+:testsetup
+	call :generate
+	set TF_ACC=
+	set _TEST=./...
+	if defined TEST set _TEST=%TEST%
+	goto :eof
+
+REM updatedeps installs all the dependencies that Terraform needs to
+REM run and build.
+:updatedeps
+	for /f "tokens=*" %%c in ('git symbolic-ref --short HEAD 2^>nul ^|^| git rev-parse HEAD') do set _REF=%%c
+	go get -u github.com/mitchellh/gox
+	go get -u golang.org/x/tools/cmd/stringer
+	go get -f -u -v ./...
+	call :setMaxExitCode %ERRORLEVEL%
+	git checkout %_REF% 1>nul 2>&1
+	exit /b %_EXITCODE%
+
+REM vet runs the Go source code static analysis tool `vet` to find
+REM any common errors.
+:vet
+	set _VETARGS=-asmdecl -atomic -bool -buildtags -copylocks -methods -nilfunc -printf -rangeloops -shift -structtags -unsafeptr
+	if defined VETARGS set _VETARGS=%VETARGS%
+
+	go tool vet 2>nul
+	if %ERRORLEVEL% equ 3 go get golang.org/x/tools/cmd/vet
+	
+	echo go tool vet %_VETARGS% .
+	go tool vet %_VETARGS% .
+	set _vetExitCode=%ERRORLEVEL%
+	if %_vetExitCode% equ 0 exit /b %_EXITCODE%
+	call :setMaxExitCode %_vetExitCode%
+	echo.
+	echo Vet found suspicious constructs. Please check the reported constructs
+	echo and fix them if necessary before submitting the code for reviewal.
+	exit /b %_EXITCODE%
+
+:setMaxExitCode
+	if %1 gtr %_EXITCODE% set _EXITCODE=%1
+	goto :eof
+
+:usage
+	echo usage: make [target]
+	echo.
+	echo target is in {%_TARGETS%}.
+	echo target defaults to test if none is provided.
+	exit /b 2
+	goto :eof