e2e: split out `pause` tests and add more cases

Pause/unpause was being partially tested under the start/stop test.
This removes it from that test and adds dedicated pause + unpause
tests.

Note that the tests assert on current behavior, though it's been
noted where that is undesirable due to divergence from the Docker
CLI. Will change the behavior + update tests in a subsequent PR.

Signed-off-by: Milas Bowman <milas.bowman@docker.com>

pkg/e2e/fixtures/pause/compose.yaml

@@ -0,0 +1,9 @@
+services:
+  a:
+    image:  nginx:alpine
+    ports: [80]
+  b:
+    image:  nginx:alpine
+    ports: [80]
+    depends_on:
+      - a

pkg/e2e/pause_test.go

@@ -0,0 +1,155 @@
+/*
+   Copyright 2020 Docker Compose CLI authors
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package e2e
+
+import (
+	"encoding/json"
+	"fmt"
+	"net"
+	"net/http"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+	"gotest.tools/v3/icmd"
+)
+
+func TestPause(t *testing.T) {
+	cli := NewParallelCLI(t, WithEnv(
+		"COMPOSE_PROJECT_NAME=e2e-pause",
+		"COMPOSE_FILE=./fixtures/pause/compose.yaml"))
+
+	cleanup := func() {
+		cli.RunDockerComposeCmd(t, "down", "-v", "--remove-orphans", "-t", "0")
+	}
+	cleanup()
+	t.Cleanup(cleanup)
+
+	// launch both services and verify that they are accessible
+	cli.RunDockerComposeCmd(t, "up", "-d")
+	urls := map[string]string{
+		"a": urlForService(t, cli, "a", 80),
+		"b": urlForService(t, cli, "b", 80),
+	}
+	for _, url := range urls {
+		HTTPGetWithRetry(t, url, http.StatusOK, 50*time.Millisecond, 5*time.Second)
+	}
+
+	// pause a and verify that it can no longer be hit but b still can
+	cli.RunDockerComposeCmd(t, "pause", "a")
+	httpClient := http.Client{Timeout: 250 * time.Millisecond}
+	resp, err := httpClient.Get(urls["a"])
+	if resp != nil {
+		_ = resp.Body.Close()
+	}
+	require.Error(t, err, "a should no longer respond")
+	require.True(t, err.(net.Error).Timeout(), "Error should have indicated a timeout")
+	HTTPGetWithRetry(t, urls["b"], http.StatusOK, 50*time.Millisecond, 5*time.Second)
+
+	// unpause a and verify that both containers work again
+	cli.RunDockerComposeCmd(t, "unpause", "a")
+	for _, url := range urls {
+		HTTPGetWithRetry(t, url, http.StatusOK, 50*time.Millisecond, 5*time.Second)
+	}
+}
+
+func TestPauseServiceNotRunning(t *testing.T) {
+	cli := NewParallelCLI(t, WithEnv(
+		"COMPOSE_PROJECT_NAME=e2e-pause-svc-not-running",
+		"COMPOSE_FILE=./fixtures/pause/compose.yaml"))
+
+	cleanup := func() {
+		cli.RunDockerComposeCmd(t, "down", "-v", "--remove-orphans", "-t", "0")
+	}
+	cleanup()
+	t.Cleanup(cleanup)
+
+	// pause a and verify that it can no longer be hit but b still can
+	res := cli.RunDockerComposeCmdNoCheck(t, "pause", "a")
+
+	// TODO: `docker pause` errors in this case, should Compose be consistent?
+	res.Assert(t, icmd.Expected{ExitCode: 0})
+}
+
+func TestPauseServiceAlreadyPaused(t *testing.T) {
+	cli := NewParallelCLI(t, WithEnv(
+		"COMPOSE_PROJECT_NAME=e2e-pause-svc-already-paused",
+		"COMPOSE_FILE=./fixtures/pause/compose.yaml"))
+
+	cleanup := func() {
+		cli.RunDockerComposeCmd(t, "down", "-v", "--remove-orphans", "-t", "0")
+	}
+	cleanup()
+	t.Cleanup(cleanup)
+
+	// launch a and wait for it to come up
+	cli.RunDockerComposeCmd(t, "up", "-d", "a")
+	HTTPGetWithRetry(t, urlForService(t, cli, "a", 80), http.StatusOK, 50*time.Millisecond, 5*time.Second)
+
+	// pause a twice - first time should pass, second time fail
+	cli.RunDockerComposeCmd(t, "pause", "a")
+	res := cli.RunDockerComposeCmdNoCheck(t, "pause", "a")
+	res.Assert(t, icmd.Expected{ExitCode: 1, Err: "already paused"})
+}
+
+func TestPauseServiceDoesNotExist(t *testing.T) {
+	cli := NewParallelCLI(t, WithEnv(
+		"COMPOSE_PROJECT_NAME=e2e-pause-svc-not-exist",
+		"COMPOSE_FILE=./fixtures/pause/compose.yaml"))
+
+	cleanup := func() {
+		cli.RunDockerComposeCmd(t, "down", "-v", "--remove-orphans", "-t", "0")
+	}
+	cleanup()
+	t.Cleanup(cleanup)
+
+	// pause a and verify that it can no longer be hit but b still can
+	res := cli.RunDockerComposeCmdNoCheck(t, "pause", "does_not_exist")
+	// TODO: `compose down does_not_exist` and similar error, this should too
+	res.Assert(t, icmd.Expected{ExitCode: 0})
+}
+
+func urlForService(t testing.TB, cli *CLI, service string, targetPort int) string {
+	t.Helper()
+	return fmt.Sprintf(
+		"http://localhost:%d",
+		publishedPortForService(t, cli, service, targetPort),
+	)
+}
+
+func publishedPortForService(t testing.TB, cli *CLI, service string, targetPort int) int {
+	t.Helper()
+	res := cli.RunDockerComposeCmd(t, "ps", "--format=json", service)
+	var psOut []struct {
+		Publishers []struct {
+			TargetPort    int
+			PublishedPort int
+		}
+	}
+	require.NoError(t, json.Unmarshal([]byte(res.Stdout()), &psOut),
+		"Failed to parse `%s` output", res.Cmd.String())
+	require.Len(t, psOut, 1, "Expected exactly 1 service")
+	svc := psOut[0]
+	for _, pp := range svc.Publishers {
+		if pp.TargetPort == targetPort {
+			return pp.PublishedPort
+		}
+	}
+	require.Failf(t, "No published port for target port",
+		"Target port: %d\nService: %s", targetPort, res.Combined())
+	return -1
+}

pkg/e2e/start_stop_test.go

@@ -78,20 +78,6 @@ func TestStartStop(t *testing.T) {
 		testify.Regexp(t, getProjectRegx("running"), res.Stdout())
 	})
 
-	t.Run("pause project", func(t *testing.T) {
-		c.RunDockerComposeCmd(t, "-f", "./fixtures/start-stop/compose.yaml", "--project-name", projectName, "pause")
-
-		res := c.RunDockerComposeCmd(t, "ls", "--all")
-		testify.Regexp(t, getProjectRegx("paused"), res.Stdout())
-	})
-
-	t.Run("unpause project", func(t *testing.T) {
-		c.RunDockerComposeCmd(t, "-f", "./fixtures/start-stop/compose.yaml", "--project-name", projectName, "unpause")
-
-		res := c.RunDockerComposeCmd(t, "ls")
-		testify.Regexp(t, getProjectRegx("running"), res.Stdout())
-	})
-
 	t.Run("down", func(t *testing.T) {
 		_ = c.RunDockerComposeCmd(t, "--project-name", projectName, "down")
 	})