Adds support for extra_hosts attribute. (#1)

* Added ExtraHosts property.

* Added tests for Load().

* Formatted codes.

.gitignore

@@ -0,0 +1 @@
+.idea

compose.go

@@ -22,6 +22,7 @@ type Service struct {
 	CapAdd      []string      `yaml:"cap_add"`
 	Tmpfs       []string      `yaml:"tmpfs"`
 	Deploy      ServiceDeploy `yaml:"deploy"`
+	ExtraHosts  []string      `yaml:"extra_hosts"`
 }
 
 // ServiceDeploy provides deployment information for a service.

compose_test.go

@@ -0,0 +1,26 @@
+package compose
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestLoad(t *testing.T) {
+	file := "./test-data/test.yaml"
+	compose, err := Load(file)
+	assert.Nil(t, err)
+
+	assert.Equal(t, compose.Services["a"].Image, "hostname.io/org/repo:version")
+	assert.Equal(t, compose.Services["a"].Volumes, []string{"a:/a", "b:/b"})
+	assert.Equal(t, compose.Services["a"].Entrypoint, []string{"/entrypoint"})
+	assert.Equal(t, compose.Services["a"].Ports, []string{"1000:2000"})
+	assert.Equal(t, compose.Services["a"].Environment, []string{"SOME_VAR=somevalue"})
+	assert.Equal(t, compose.Services["a"].CapAdd, []string{"NET_ADMIN"})
+	assert.Equal(t, compose.Services["a"].Tmpfs, []string{"/tmp"})
+	assert.Equal(t, compose.Services["a"].Deploy.Resources.Reservations.CPUs, "50m")
+	assert.Equal(t, compose.Services["a"].Deploy.Resources.Reservations.Memory, "768Mi")
+	assert.Equal(t, compose.Services["a"].Deploy.Resources.Limits.CPUs, "500m")
+	assert.Equal(t, compose.Services["a"].Deploy.Resources.Limits.Memory, "2048Mi")
+	assert.Equal(t, compose.Services["a"].ExtraHosts, []string{"some.hostname:1.2.3.4"})
+}

test-data/test.yaml

@@ -0,0 +1,27 @@
+version: "3"
+services:
+  a:
+    image: hostname.io/org/repo:version
+    volumes:
+      - "a:/a"
+      - "b:/b"
+    entrypoint:
+      - "/entrypoint"
+    ports:
+      - "1000:2000"
+    environment:
+      - SOME_VAR=somevalue
+    cap_add:
+      - NET_ADMIN
+    tmpfs:
+      - /tmp
+    deploy:
+      resources:
+        reservations:
+          cpus:   '50m'
+          memory: '768Mi'
+        limits:
+          cpus:   '500m'
+          memory: '2048Mi'
+    extra_hosts:
+      - "some.hostname:1.2.3.4"