Use assert.ErrorContains

directory/directory_test.go

@@ -142,8 +142,7 @@ func TestPutBlobDigestFailure(t *testing.T) {
 	require.NoError(t, err)
 	defer dest.Close()
 	_, err = dest.PutBlob(context.Background(), reader, types.BlobInfo{Digest: blobDigest, Size: -1}, cache, false)
-	assert.Error(t, err)
-	assert.Contains(t, digestErrorString, err.Error())
+	assert.ErrorContains(t, err, digestErrorString)
 	err = dest.Commit(context.Background(), nil) // nil unparsedToplevel is invalid, we don’t currently use the value
 	assert.NoError(t, err)
 

docker/daemon/client_test.go

@@ -1,13 +1,14 @@
 package daemon
 
-import "testing"
 import (
-	"github.com/containers/image/v5/types"
-	dockerclient "github.com/docker/docker/client"
-	"github.com/stretchr/testify/assert"
 	"net/http"
 	"os"
 	"path/filepath"
+	"testing"
+
+	"github.com/containers/image/v5/types"
+	dockerclient "github.com/docker/docker/client"
+	"github.com/stretchr/testify/assert"
 )
 
 func TestDockerClientFromNilSystemContext(t *testing.T) {
@@ -45,10 +46,7 @@ func TestTlsConfigFromInvalidCertPath(t *testing.T) {
 	}
 
 	_, err := tlsConfig(ctx)
-
-	if assert.Error(t, err, "An error was expected") {
-		assert.Regexp(t, "could not read CA certificate", err.Error())
-	}
+	assert.ErrorContains(t, err, "could not read CA certificate")
 }
 
 func TestTlsConfigFromCertPath(t *testing.T) {

docker/lookaside_test.go

@@ -170,9 +170,8 @@ func TestLoadAndMergeConfig(t *testing.T) {
 		[]byte("default-docker:\n sigstore: file:////tmp/different"), 0644)
 	require.NoError(t, err)
 	_, err = loadAndMergeConfig(duplicateDefault)
-	require.Error(t, err)
-	assert.Contains(t, err.Error(), "0.yaml")
-	assert.Contains(t, err.Error(), "1.yaml")
+	assert.ErrorContains(t, err, "0.yaml")
+	assert.ErrorContains(t, err, "1.yaml")
 
 	// Duplicate DefaultDocker
 	duplicateNS := filepath.Join(tmpDir, "duplicateNS")
@@ -185,9 +184,8 @@ func TestLoadAndMergeConfig(t *testing.T) {
 		[]byte("docker:\n example.com:\n  sigstore: file:////tmp/different"), 0644)
 	require.NoError(t, err)
 	_, err = loadAndMergeConfig(duplicateNS)
-	assert.Error(t, err)
-	assert.Contains(t, err.Error(), "0.yaml")
-	assert.Contains(t, err.Error(), "1.yaml")
+	assert.ErrorContains(t, err, "0.yaml")
+	assert.ErrorContains(t, err, "1.yaml")
 
 	// A fully worked example, including an empty-dictionary file and a non-.yaml file
 	config, err = loadAndMergeConfig("fixtures/registries.d")

manifest/common_test.go

@@ -88,10 +88,9 @@ func testValidManifestWithExtraFieldsIsRejected(t *testing.T, parser func([]byte
 		updatedManifest := []byte(string(validManifest[:end]) +
 			fmt.Sprintf(`,"%s":[]}`, field))
 		err := parser(updatedManifest)
-		assert.Error(t, err, field)
 		// Make sure it is the error from validateUnambiguousManifestFormat, not something that
 		// went wrong with creating updatedManifest.
-		assert.Contains(t, err.Error(), "rejecting ambiguous manifest")
+		assert.ErrorContains(t, err, "rejecting ambiguous manifest", field)
 	}
 }
 

oci/layout/oci_dest_test.go

@@ -58,8 +58,7 @@ func TestPutBlobDigestFailure(t *testing.T) {
 	require.NoError(t, err)
 	defer dest.Close()
 	_, err = dest.PutBlob(context.Background(), reader, types.BlobInfo{Digest: blobDigest, Size: -1}, cache, false)
-	assert.Error(t, err)
-	assert.Contains(t, digestErrorString, err.Error())
+	assert.ErrorContains(t, err, digestErrorString)
 	err = dest.Commit(context.Background(), nil) // nil unparsedToplevel is invalid, we don’t currently use the value
 	assert.NoError(t, err)
 

oci/layout/oci_transport_test.go

@@ -316,6 +316,5 @@ func TestReferenceBlobPathInvalid(t *testing.T) {
 	ociRef, ok := ref.(ociReference)
 	require.True(t, ok)
 	_, err := ociRef.blobPath(hex, "")
-	assert.Error(t, err)
-	assert.Contains(t, err.Error(), "unexpected digest reference "+hex)
+	assert.ErrorContains(t, err, "unexpected digest reference "+hex)
 }

pkg/docker/config/config_test.go

@@ -7,7 +7,6 @@ import (
 	"os"
 	"path/filepath"
 	"runtime"
-	"strings"
 	"testing"
 
 	"github.com/containers/image/v5/docker/reference"
@@ -492,13 +491,8 @@ func TestGetAuthFailsOnBadInput(t *testing.T) {
 	if err := ioutil.WriteFile(configPath, []byte("Json rocks! Unless it doesn't."), 0640); err != nil {
 		t.Fatalf("failed to write file %q: %v", configPath, err)
 	}
-	auth, err = getCredentialsWithHomeDir(nil, "index.docker.io", tmpHomeDir)
-	if err == nil {
-		t.Fatalf("got unexpected non-error: username=%q, password=%q", auth.Username, auth.Password)
-	}
-	if !strings.Contains(err.Error(), "unmarshaling JSON") {
-		t.Fatalf("expected JSON syntax error, not: %#+v", err)
-	}
+	_, err = getCredentialsWithHomeDir(nil, "index.docker.io", tmpHomeDir)
+	assert.ErrorContains(t, err, "unmarshaling JSON")
 
 	// remove the invalid config file
 	os.RemoveAll(configPath)
@@ -513,13 +507,8 @@ func TestGetAuthFailsOnBadInput(t *testing.T) {
 	if err := ioutil.WriteFile(configPath, []byte("I'm certainly not a json string."), 0640); err != nil {
 		t.Fatalf("failed to write file %q: %v", configPath, err)
 	}
-	auth, err = getCredentialsWithHomeDir(nil, "index.docker.io", tmpHomeDir)
-	if err == nil {
-		t.Fatalf("got unexpected non-error: username=%q, password=%q", auth.Username, auth.Password)
-	}
-	if !strings.Contains(err.Error(), "unmarshaling JSON") {
-		t.Fatalf("expected JSON syntax error, not: %#+v", err)
-	}
+	_, err = getCredentialsWithHomeDir(nil, "index.docker.io", tmpHomeDir)
+	assert.ErrorContains(t, err, "unmarshaling JSON")
 }
 
 func TestGetAllCredentials(t *testing.T) {

pkg/sysregistriesv2/system_registries_v2_test.go

@@ -70,8 +70,7 @@ func TestParseLocation(t *testing.T) {
 
 	// invalid locations
 	_, err = parseLocation("https://example.com")
-	assert.NotNil(t, err)
-	assert.Contains(t, err.Error(), "invalid location 'https://example.com': URI schemes are not supported")
+	assert.ErrorContains(t, err, "invalid location 'https://example.com': URI schemes are not supported")
 
 	_, err = parseLocation("john.doe@example.com")
 	assert.Nil(t, err)
@@ -434,7 +433,7 @@ func TestInvalidV2Configs(t *testing.T) {
 		_, err := GetRegistries(&types.SystemContext{SystemRegistriesConfPath: c.path})
 		assert.Error(t, err, c.path)
 		if c.errorSubstring != "" {
-			assert.Contains(t, err.Error(), c.errorSubstring, c.path)
+			assert.ErrorContains(t, err, c.errorSubstring, c.path)
 		}
 	}
 }
@@ -483,8 +482,7 @@ func TestMixingV1andV2(t *testing.T) {
 		SystemRegistriesConfPath:    "testdata/mixing-v1-v2.conf",
 		SystemRegistriesConfDirPath: "testdata/this-does-not-exist",
 	})
-	require.Error(t, err)
-	assert.Contains(t, err.Error(), "mixing sysregistry v1/v2 is not supported")
+	assert.ErrorContains(t, err, "mixing sysregistry v1/v2 is not supported")
 }
 
 func TestConfigCache(t *testing.T) {

signature/docker_test.go

@@ -70,8 +70,7 @@ func TestSignDockerManifestWithPassphrase(t *testing.T) {
 
 	// Invalid passphrase
 	_, err = SignDockerManifestWithOptions(manifest, TestImageSignatureReference, mech, TestKeyFingerprintWithPassphrase, &SignOptions{Passphrase: TestPassphrase + "\n"})
-	require.Error(t, err)
-	assert.Contains(t, err.Error(), "invalid passphrase")
+	assert.ErrorContains(t, err, "invalid passphrase")
 
 	// Wrong passphrase
 	_, err = SignDockerManifestWithOptions(manifest, TestImageSignatureReference, mech, TestKeyFingerprintWithPassphrase, &SignOptions{Passphrase: "wrong"})