[Heartbeat] Unit test plugin import at cmd level (#39830) (#39831)

* [Heartbeat] Unit test plugin imports inside cmd module
Add unit test to cover plugin imports at cmd module, to be run from agentbeat.

(cherry picked from commit 3b24698)

Co-authored-by: Emilio Alvarez Piñeiro <[email protected]>

heartbeat/cmd/root_test.go

@@ -0,0 +1,40 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you 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 cmd
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/elastic/beats/v7/heartbeat/monitors/plugin"
+)
+
+// Test all required plugins are exported by this module, since it's the
+// one imported by agentbeat: https://github.com/elastic/beats/pull/39818
+func TestRootCmdPlugins(t *testing.T) {
+	t.Parallel()
+	plugins := []string{"http", "tcp", "icmp"}
+	for _, p := range plugins {
+		t.Run(fmt.Sprintf("%s plugin", p), func(t *testing.T) {
+			_, found := plugin.GlobalPluginsReg.Get(p)
+			assert.True(t, found)
+		})
+	}
+}

x-pack/heartbeat/cmd/root_test.go

@@ -0,0 +1,28 @@
+// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+// or more contributor license agreements. Licensed under the Elastic License;
+// you may not use this file except in compliance with the Elastic License.
+//go:build linux || synthetics
+
+package cmd
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/elastic/beats/v7/heartbeat/monitors/plugin"
+)
+
+// Test all required plugins are exported by this module, since it's the
+// one imported by agentbeat: https://github.com/elastic/beats/pull/39818
+func TestRootCmdPlugins(t *testing.T) {
+	t.Parallel()
+	plugins := []string{"http", "tcp", "icmp", "browser"}
+	for _, p := range plugins {
+		t.Run(fmt.Sprintf("%s plugin", p), func(t *testing.T) {
+			_, found := plugin.GlobalPluginsReg.Get(p)
+			assert.True(t, found)
+		})
+	}
+}