DockerCLI/e2e/cli-plugins/help_test.go

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package cliplugins
import (
"bufio"
"regexp"
"strings"
"testing"
"gotest.tools/assert"
is "gotest.tools/assert/cmp"
"gotest.tools/icmd"
)
// TestGlobalHelp ensures correct behaviour when running `docker help`
func TestGlobalHelp(t *testing.T) {
run, _, cleanup := prepare(t)
defer cleanup()
res := icmd.RunCmd(run("help"))
res.Assert(t, icmd.Expected{
ExitCode: 0,
})
assert.Assert(t, is.Equal(res.Stderr(), ""))
scanner := bufio.NewScanner(strings.NewReader(res.Stdout()))
// Instead of baking in the full current output of `docker
// help`, which can be expected to change regularly, bake in
// some checkpoints. Key things we are looking for:
//
// - The top-level description
// - Each of the main headings
// - Some builtin commands under the main headings
// - The `helloworld` plugin in the appropriate place
// - The `badmeta` plugin under the "Invalid Plugins" heading.
//
// Regexps are needed because the width depends on `unix.TIOCGWINSZ` or similar.
helloworldre := regexp.MustCompile(`^ helloworld\*\s+A basic Hello World plugin for tests \(Docker Inc\., testing\)$`)
badmetare := regexp.MustCompile(`^ badmeta\s+invalid metadata: invalid character 'i' looking for beginning of object key string$`)
var helloworldcount, badmetacount int
for _, expected := range []*regexp.Regexp{
regexp.MustCompile(`^A self-sufficient runtime for containers$`),
regexp.MustCompile(`^Management Commands:$`),
regexp.MustCompile(`^ container\s+Manage containers$`),
helloworldre,
regexp.MustCompile(`^ image\s+Manage images$`),
regexp.MustCompile(`^Commands:$`),
regexp.MustCompile(`^ create\s+Create a new container$`),
regexp.MustCompile(`^Invalid Plugins:$`),
badmetare,
nil, // scan to end of input rather than stopping at badmetare
} {
var found bool
for scanner.Scan() {
text := scanner.Text()
if helloworldre.MatchString(text) {
helloworldcount++
}
if badmetare.MatchString(text) {
badmetacount++
}
if expected != nil && expected.MatchString(text) {
found = true
break
}
}
assert.Assert(t, expected == nil || found, "Did not find match for %q in `docker help` output", expected)
}
// We successfully scanned all the input
assert.Assert(t, !scanner.Scan())
assert.NilError(t, scanner.Err())
// Plugins should only be listed once.
assert.Assert(t, is.Equal(helloworldcount, 1))
assert.Assert(t, is.Equal(badmetacount, 1))
// Running with `--help` should produce the same.
res2 := icmd.RunCmd(run("--help"))
res2.Assert(t, icmd.Expected{
ExitCode: 0,
})
assert.Assert(t, is.Equal(res2.Stdout(), res.Stdout()))
assert.Assert(t, is.Equal(res2.Stderr(), ""))
// Running just `docker` (without `help` nor `--help`) should produce the same thing, except on Stderr.
res2 = icmd.RunCmd(run())
res2.Assert(t, icmd.Expected{
ExitCode: 0,
})
assert.Assert(t, is.Equal(res2.Stdout(), ""))
assert.Assert(t, is.Equal(res2.Stderr(), res.Stdout()))
}