add config tests

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

config/default_test.go

@@ -0,0 +1,40 @@
+package config
+
+import (
+	"os"
+	"testing"
+
+	envconfig "github.com/unistack-org/micro-config-env"
+	"github.com/unistack-org/micro/v3"
+	"github.com/unistack-org/micro/v3/config"
+)
+
+type Config struct {
+	String string `env:"MICRO_TEST" default:"default"`
+}
+
+func TestMultiple(t *testing.T) {
+	cfg := &Config{}
+	svc := micro.NewService(micro.Configs(
+		config.NewConfig(config.Struct(cfg)),
+		envconfig.NewConfig(config.Struct(cfg)),
+	),
+	)
+	if err := svc.Init(); err != nil {
+		t.Fatal(err)
+	}
+	if cfg.String != "default" {
+		t.Fatalf("config not parsed by default source: %#+v\n", cfg)
+	}
+	os.Setenv("MICRO_TEST", "non_default")
+	if err := svc.Init(); err != nil {
+		t.Fatal(err)
+	}
+	if cfg.String == "default" {
+		t.Fatalf("config not parsed by default source: %#+v\n", cfg)
+	}
+	if cfg.String != "non_default" {
+		t.Fatalf("config not parsed by default source: %#+v\n", cfg)
+	}
+	t.Logf("config: %#+v\n", cfg)
+}