Fix: update specs to match err string w/o case sensitivity

Recent linting changes to bosh-utils have change the case of some err messages,
this commit changes err message matching to be case-insensitive to avoid future
breakage.

Author: aramprice

cmd/logs_test.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"os"
+	"strings"
 	"time"
 
 	"code.cloudfoundry.org/clock"
@@ -750,7 +751,7 @@ var _ = Describe("Logs", func() {
 
 						err := command.Run(logsOpts)
 						Expect(err).To(HaveOccurred())
-						Expect(err.Error()).To(ContainSubstring("Unable to parse digest string"))
+						Expect(strings.ToLower(err.Error())).To(ContainSubstring("unable to parse digest string"))
 					})
 
 					It("returns error if verifying the log file sha fails", func() {

release/pkg/compiled_package_test.go

@@ -2,6 +2,7 @@ package pkg_test
 
 import (
 	"errors"
+	"strings"
 
 	"github.com/cloudfoundry/bosh-utils/crypto/cryptofakes"
 	fakes2 "github.com/cloudfoundry/bosh-utils/system/fakes"
@@ -188,7 +189,7 @@ var _ = Describe("NewCompiledPackageWithArchive", func() {
 			It("returns an error parsing the current digest", func() {
 				_, err := compiledPkg.RehashWithCalculator(fakeDigestCalculator, fakeArchiveReader)
 				Expect(err).To(HaveOccurred())
-				Expect(err.Error()).To(ContainSubstring("No digest algorithm found. Supported algorithms"))
+				Expect(strings.ToLower(err.Error())).To(ContainSubstring("no digest algorithm found. supported algorithms"))
 			})
 		})
 	})

release/resource/resource_test.go

@@ -2,6 +2,7 @@ package resource_test
 
 import (
 	"errors"
+	"strings"
 
 	boshcrypto "github.com/cloudfoundry/bosh-utils/crypto"
 	fakesfs "github.com/cloudfoundry/bosh-utils/system/fakes"
@@ -483,7 +484,7 @@ var _ = Describe("NewResourceWithBuiltArchive", func() {
 				It("should return an error", func() {
 					_, err := resource.RehashWithCalculator(fakeDigestCalculator, boshcrypto.ArchiveDigestFilePathReader(fakeFs))
 					Expect(err).To(HaveOccurred())
-					Expect(err.Error()).To(ContainSubstring("No digest algorithm found. Supported algorithms"))
+					Expect(strings.ToLower(err.Error())).To(ContainSubstring("no digest algorithm found. supported algorithms"))
 				})
 			})
 		})

releasedir/fs_blobs_dir_test.go

@@ -309,7 +309,7 @@ bad-sha-blob.tgz:
 
 			It("returns descriptive error", func() {
 				err := act(1)
-				Expect(err).To(MatchError(ContainSubstring("No digest algorithm found. Supported algorithms: sha1, sha256, sha512")))
+				Expect(strings.ToLower(err.Error())).To(ContainSubstring("no digest algorithm found. supported algorithms: sha1, sha256, sha512"))
 			})
 		})
 

releasedir/index/fs_index_blobs_test.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"os"
 	"path/filepath"
+	"strings"
 	"syscall"
 
 	fakeblob "github.com/cloudfoundry/bosh-utils/blobstore/fakes"
@@ -163,8 +164,8 @@ var _ = Describe("FSIndexBlobs", func() {
 				//currently, the only way to cause a digest parse failure is with an empty string
 				_, err := blobs.Get("name", "blob-id", "")
 				Expect(err).To(HaveOccurred())
-				Expect(err.Error()).To(ContainSubstring(
-					"No digest algorithm found. Supported algorithms: sha1, sha256, sha512"))
+				Expect(strings.ToLower(err.Error())).To(ContainSubstring(
+					"no digest algorithm found. supported algorithms: sha1, sha256, sha512"))
 			})
 
 			Context("when downloading blob fails", func() {