Unit test run help

Signed-off-by: Christopher Crone <christopher.crone@docker.com>

cli/cmd/run/run_test.go

@@ -0,0 +1,42 @@
+/*
+	Copyright (c) 2020 Docker Inc.
+
+	Permission is hereby granted, free of charge, to any person
+	obtaining a copy of this software and associated documentation
+	files (the "Software"), to deal in the Software without
+	restriction, including without limitation the rights to use, copy,
+	modify, merge, publish, distribute, sublicense, and/or sell copies
+	of the Software, and to permit persons to whom the Software is
+	furnished to do so, subject to the following conditions:
+
+	The above copyright notice and this permission notice shall be
+	included in all copies or substantial portions of the Software.
+
+	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+	EXPRESS OR IMPLIED,
+	INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+	IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+	HOLDERS BE LIABLE FOR ANY CLAIM,
+	DAMAGES OR OTHER LIABILITY,
+	WHETHER IN AN ACTION OF CONTRACT,
+	TORT OR OTHERWISE,
+	ARISING FROM, OUT OF OR IN CONNECTION WITH
+	THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+package run
+
+import (
+	"bytes"
+	"testing"
+
+	"gotest.tools/v3/golden"
+)
+
+func TestHelp(t *testing.T) {
+	var b bytes.Buffer
+	c := Command()
+	c.SetOutput(&b)
+	_ = c.Help()
+	golden.Assert(t, b.String(), "run-help.golden")
+}

cli/cmd/run/testdata/run-help.golden

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+Run a container
+
+Usage:
+  run [flags]
+
+Flags:
+  -l, --label stringArray     Set meta data on a container
+      --name string           Assign a name to the container
+  -p, --publish stringArray   Publish a container's port(s). [HOST_PORT:]CONTAINER_PORT
+  -v, --volume stringArray    Volume. Ex: user:key@my_share:/absolute/path/to/target