diff --git a/cmd/skopeo/fixtures/.gitignore b/cmd/skopeo/fixtures/.gitignore
new file mode 100644
index 00000000..3730cb25
--- /dev/null
+++ b/cmd/skopeo/fixtures/.gitignore
@@ -0,0 +1,4 @@
+/*.gpg~
+/.gpg-v21-migrated
+/private-keys-v1.d
+/random_seed
diff --git a/cmd/skopeo/fixtures/corrupt.signature b/cmd/skopeo/fixtures/corrupt.signature
new file mode 120000
index 00000000..36e7e79b
--- /dev/null
+++ b/cmd/skopeo/fixtures/corrupt.signature
@@ -0,0 +1 @@
+../../../signature/fixtures/corrupt.signature
\ No newline at end of file
diff --git a/cmd/skopeo/fixtures/image.manifest.json b/cmd/skopeo/fixtures/image.manifest.json
new file mode 120000
index 00000000..a115eb98
--- /dev/null
+++ b/cmd/skopeo/fixtures/image.manifest.json
@@ -0,0 +1 @@
+../../../signature/fixtures/image.manifest.json
\ No newline at end of file
diff --git a/cmd/skopeo/fixtures/image.signature b/cmd/skopeo/fixtures/image.signature
new file mode 120000
index 00000000..dae8bd52
--- /dev/null
+++ b/cmd/skopeo/fixtures/image.signature
@@ -0,0 +1 @@
+../../../signature/fixtures/image.signature
\ No newline at end of file
diff --git a/cmd/skopeo/fixtures/pubring.gpg b/cmd/skopeo/fixtures/pubring.gpg
new file mode 120000
index 00000000..cda2fbc8
--- /dev/null
+++ b/cmd/skopeo/fixtures/pubring.gpg
@@ -0,0 +1 @@
+../../../signature/fixtures/pubring.gpg
\ No newline at end of file
diff --git a/cmd/skopeo/fixtures/secring.gpg b/cmd/skopeo/fixtures/secring.gpg
new file mode 120000
index 00000000..8d3ffa52
--- /dev/null
+++ b/cmd/skopeo/fixtures/secring.gpg
@@ -0,0 +1 @@
+../../../signature/fixtures/secring.gpg
\ No newline at end of file
diff --git a/cmd/skopeo/fixtures/trustdb.gpg b/cmd/skopeo/fixtures/trustdb.gpg
new file mode 120000
index 00000000..55945b32
--- /dev/null
+++ b/cmd/skopeo/fixtures/trustdb.gpg
@@ -0,0 +1 @@
+../../../signature/fixtures/trustdb.gpg
\ No newline at end of file
diff --git a/cmd/skopeo/signing_test.go b/cmd/skopeo/signing_test.go
new file mode 100644
index 00000000..14c37a26
--- /dev/null
+++ b/cmd/skopeo/signing_test.go
@@ -0,0 +1,126 @@
+package main
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+
+	"github.com/projectatomic/skopeo/signature"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+const (
+	// fixturesTestImageManifestDigest is the Docker manifest digest of "image.manifest.json"
+	fixturesTestImageManifestDigest = "sha256:20bf21ed457b390829cdbeec8795a7bea1626991fda603e0d01b4e7f60427e55"
+	// fixturesTestKeyFingerprint is the fingerprint of the private key.
+	fixturesTestKeyFingerprint = "1D8230F6CDB6A06716E414C1DB72F2188BB46CC8"
+)
+
+// Test that results of runSkopeo failed with nothing on stdout, and substring
+// within the error message.
+func assertTestFailed(t *testing.T, stdout string, err error, substring string) {
+	assert.Error(t, err)
+	assert.Empty(t, stdout)
+	assert.Contains(t, err.Error(), substring)
+}
+
+func TestStandaloneSign(t *testing.T) {
+	manifestPath := "fixtures/image.manifest.json"
+	dockerReference := "testing/manifest"
+	os.Setenv("GNUPGHOME", "fixtures")
+	defer os.Unsetenv("GNUPGHOME")
+
+	// Invalid command-line arguments
+	for _, args := range [][]string{
+		{},
+		{"a1", "a2"},
+		{"a1", "a2", "a3"},
+		{"a1", "a2", "a3", "a4"},
+		{"-o", "o", "a1", "a2"},
+		{"-o", "o", "a1", "a2", "a3", "a4"},
+	} {
+		out, err := runSkopeo(append([]string{"standalone-sign"}, args...)...)
+		assertTestFailed(t, out, err, "Usage")
+	}
+
+	// Error reading manifest
+	out, err := runSkopeo("standalone-sign", "-o", "/dev/null",
+		"/this/doesnt/exist", dockerReference, fixturesTestKeyFingerprint)
+	assertTestFailed(t, out, err, "/this/doesnt/exist")
+
+	// Invalid Docker reference
+	out, err = runSkopeo("standalone-sign", "-o", "/dev/null",
+		manifestPath, "" /* empty reference */, fixturesTestKeyFingerprint)
+	assertTestFailed(t, out, err, "empty signature content")
+
+	// Unknown key. (FIXME? The error is 'Error creating signature: End of file")
+	out, err = runSkopeo("standalone-sign", "-o", "/dev/null",
+		manifestPath, dockerReference, "UNKNOWN GPG FINGERPRINT")
+	assert.Error(t, err)
+	assert.Empty(t, out)
+
+	// Error writing output
+	out, err = runSkopeo("standalone-sign", "-o", "/dev/full",
+		manifestPath, dockerReference, fixturesTestKeyFingerprint)
+	assertTestFailed(t, out, err, "/dev/full")
+
+	// Success
+	sigOutput, err := ioutil.TempFile("", "sig")
+	require.NoError(t, err)
+	defer os.Remove(sigOutput.Name())
+	out, err = runSkopeo("standalone-sign", "-o", sigOutput.Name(),
+		manifestPath, dockerReference, fixturesTestKeyFingerprint)
+	assert.NoError(t, err)
+	assert.Empty(t, out)
+
+	sig, err := ioutil.ReadFile(sigOutput.Name())
+	require.NoError(t, err)
+	manifest, err := ioutil.ReadFile(manifestPath)
+	require.NoError(t, err)
+	mech, err := signature.NewGPGSigningMechanism()
+	require.NoError(t, err)
+	verified, err := signature.VerifyDockerManifestSignature(sig, manifest, dockerReference, mech, fixturesTestKeyFingerprint)
+	assert.NoError(t, err)
+	assert.Equal(t, dockerReference, verified.DockerReference)
+	assert.Equal(t, fixturesTestImageManifestDigest, verified.DockerManifestDigest)
+}
+
+func TestStandaloneVerify(t *testing.T) {
+	manifestPath := "fixtures/image.manifest.json"
+	signaturePath := "fixtures/image.signature"
+	dockerReference := "testing/manifest"
+	os.Setenv("GNUPGHOME", "fixtures")
+	defer os.Unsetenv("GNUPGHOME")
+
+	// Invalid command-line arguments
+	for _, args := range [][]string{
+		{},
+		{"a1", "a2", "a3"},
+		{"a1", "a2", "a3", "a4", "a5"},
+	} {
+		out, err := runSkopeo(append([]string{"standalone-verify"}, args...)...)
+		assertTestFailed(t, out, err, "Usage")
+	}
+
+	// Error reading manifest
+	out, err := runSkopeo("standalone-verify", "/this/doesnt/exist",
+		dockerReference, fixturesTestKeyFingerprint, signaturePath)
+	assertTestFailed(t, out, err, "/this/doesnt/exist")
+
+	// Error reading signature
+	out, err = runSkopeo("standalone-verify", manifestPath,
+		dockerReference, fixturesTestKeyFingerprint, "/this/doesnt/exist")
+	assertTestFailed(t, out, err, "/this/doesnt/exist")
+
+	// Error verifying signature
+	out, err = runSkopeo("standalone-verify", manifestPath,
+		dockerReference, fixturesTestKeyFingerprint, "fixtures/corrupt.signature")
+	assertTestFailed(t, out, err, "Error verifying signature")
+
+	// Success
+	out, err = runSkopeo("standalone-verify", manifestPath,
+		dockerReference, fixturesTestKeyFingerprint, signaturePath)
+	assert.NoError(t, err)
+	assert.Equal(t, "Signature verified, digest "+fixturesTestImageManifestDigest+"\n", out)
+}