Fix windows test failures

Signed-off-by: Andrew Meyer <ameyer@pivotal.io>
Signed-off-by: Natalie Arellano <narellano@pivotal.io>

build_test.go

@@ -1068,7 +1068,7 @@ func testBuild(t *testing.T, when spec.G, it spec.S) {
 							Builder:    builderName,
 							ClearCache: true,
 							Buildpacks: []string{
-								"buildid@buildpack.1.version",
+								"buildpack.1.id@buildpack.1.version",
 								filepath.Join("testdata", "buildpack"),
 							},
 						})

internal/buildpack/locatortype.go

@@ -2,6 +2,7 @@ package buildpack
 
 import (
 	"fmt"
+	"os"
 	"strings"
 
 	"github.com/google/go-containerregistry/pkg/name"
@@ -52,11 +53,7 @@ func GetLocatorType(locator string, buildpacksFromBuilder []dist.BuildpackInfo)
 		return URILocator, nil
 	}
 
-	exists, err := paths.Exists(locator)
-	if err != nil {
-		return InvalidLocator, err
-	}
-	if exists {
+	if _, err := os.Stat(locator); err == nil {
 		return URILocator, nil
 	}
 

internal/paths/paths.go

@@ -24,16 +24,6 @@ func IsDir(path string) (bool, error) {
 	return fileInfo.IsDir(), nil
 }
 
-func Exists(path string) (bool, error) {
-	if _, err := os.Stat(path); err != nil {
-		if os.IsNotExist(err) {
-			return false, nil // does not exist
-		}
-		return false, err // some other error
-	}
-	return true, nil
-}
-
 func FilePathToURI(path string) (string, error) {
 	var err error
 	if !filepath.IsAbs(path) {