Improve an error message

Author: amogh09

agent/vendor/github.com/aws/amazon-ecs-agent/ecs-agent/utils/net/netutils_linux.go

@@ -198,7 +198,7 @@ func GetLoopbackInterface(nlWrapper netlinkwrapper.NetLink) (netlink.Link, error
 // - An error if ipFamily is invalid or if there's a problem accessing route information
 func GetDefaultNetworkInterface(nlWrapper netlinkwrapper.NetLink, ipFamily int) (netlink.Link, error) {
 	if ipFamily != netlink.FAMILY_V4 && ipFamily != netlink.FAMILY_V6 {
-		return nil, fmt.Errorf("ipFamily must be FAMILY_V4 or FAMILY_V6, got FAMILY_ALL")
+		return nil, fmt.Errorf("ipFamily must be FAMILY_V4 or FAMILY_V6, got %d", ipFamily)
 	}
 
 	// Get all routes
@@ -294,4 +294,4 @@ func FilterIPv6GlobalUnicast(ipAddrs []net.IP) []net.IP {
 		}
 	}
 	return ipv6Addrs
-}
+}

ecs-agent/utils/net/netutils_linux.go

@@ -732,7 +732,7 @@ func TestGetDefaultNetworkInterface(t *testing.T) {
 			ipFamily: netlink.FAMILY_ALL,
 			setupMock: func(mockNl *mock_netlinkwrapper.MockNetLink) {
 			},
-			expectedError: fmt.Errorf("ipFamily must be FAMILY_V4 or FAMILY_V6, got FAMILY_ALL"),
+			expectedError: fmt.Errorf("ipFamily must be FAMILY_V4 or FAMILY_V6, got 0"),
 		},
 	}
 
@@ -1035,4 +1035,4 @@ func TestGetLinkGlobalIPAddrs(t *testing.T) {
 			}
 		})
 	}
-}
+}