2 files changed, 26 insertions, 1 deletions
diff --git a/plumbing/transport/ssh/common.go b/plumbing/transport/ssh/common.go
index 46fda73..05dea44 100644
--- a/plumbing/transport/ssh/common.go
+++ b/plumbing/transport/ssh/common.go
@@ -49,7 +49,9 @@ type runner struct {
 func (r *runner) Command(cmd string, ep *transport.Endpoint, auth transport.AuthMethod) (common.Command, error) {
 	c := &command{command: cmd, endpoint: ep, config: r.config}
 	if auth != nil {
-		c.setAuth(auth)
+		if err := c.setAuth(auth); err != nil {
+			return nil, err
+		}
 	}
 
 	if err := c.connect(); err != nil {
diff --git a/plumbing/transport/ssh/common_test.go b/plumbing/transport/ssh/common_test.go
index 4cc2a06..a724936 100644
--- a/plumbing/transport/ssh/common_test.go
+++ b/plumbing/transport/ssh/common_test.go
@@ -206,3 +206,26 @@ func (c *mockSSHConfig) Get(alias, key string) string {
 
 	return a[key]
 }
+
+type invalidAuthMethod struct {
+}
+
+func (a *invalidAuthMethod) Name() string {
+	return "invalid"
+}
+
+func (a *invalidAuthMethod) String() string {
+	return "invalid"
+}
+
+func (s *SuiteCommon) TestCommandWithInvalidAuthMethod(c *C) {
+	uploadPack := &UploadPackSuite{}
+	uploadPack.SetUpSuite(c)
+	r := &runner{}
+	auth := &invalidAuthMethod{}
+
+	_, err := r.Command("command", uploadPack.newEndpoint(c, "endpoint"), auth)
+
+	c.Assert(err, NotNil)
+	c.Assert(err, ErrorMatches, "invalid auth method")
+}