Add unit tests to container_name

Signed-off-by: Ulysses Souza <ulyssessouza@gmail.com>

local/compose/convergence_test.go

@@ -0,0 +1,55 @@
+/*
+   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 compose
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/compose-spec/compose-go/types"
+	"gotest.tools/assert"
+)
+
+func TestContainerName(t *testing.T) {
+	var replicas uint64 = 1
+	s := types.ServiceConfig{
+		Name:          "testservicename",
+		ContainerName: "testcontainername",
+		Scale:         1,
+		Deploy:        &types.DeployConfig{},
+	}
+	ret, err := getScale(s)
+	assert.NilError(t, err)
+	assert.Equal(t, ret, s.Scale)
+
+	s.Scale = 0
+	s.Deploy.Replicas = &replicas
+	ret, err = getScale(s)
+	assert.NilError(t, err)
+	assert.Equal(t, ret, int(*s.Deploy.Replicas))
+
+	s.Deploy.Replicas = nil
+	s.Scale = 2
+	_, err = getScale(s)
+	assert.Error(t, err, fmt.Sprintf(doubledContainerNameWarning, s.Name, s.ContainerName))
+
+	replicas = 2
+	s.Deploy.Replicas = &replicas
+	s.Scale = 0
+	_, err = getScale(s)
+	assert.Error(t, err, fmt.Sprintf(doubledContainerNameWarning, s.Name, s.ContainerName))
+}