New static configuration loading system.

Co-authored-by: Mathieu Lonjaret <mathieu.lonjaret@gmail.com>

pkg/config/file/file_test.go

@@ -0,0 +1,76 @@
+package file
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestDecode_TOML(t *testing.T) {
+	f, err := ioutil.TempFile("", "traefik-config-*.toml")
+	require.NoError(t, err)
+	defer func() {
+		_ = os.Remove(f.Name())
+	}()
+
+	_, err = f.Write([]byte(`
+foo = "bar"
+fii = "bir"
+[yi]
+`))
+	require.NoError(t, err)
+
+	element := &Yo{
+		Fuu: "test",
+	}
+
+	err = Decode(f.Name(), element)
+	require.NoError(t, err)
+
+	expected := &Yo{
+		Foo: "bar",
+		Fii: "bir",
+		Fuu: "test",
+		Yi: &Yi{
+			Foo: "foo",
+			Fii: "fii",
+		},
+	}
+	assert.Equal(t, expected, element)
+}
+
+func TestDecode_YAML(t *testing.T) {
+	f, err := ioutil.TempFile("", "traefik-config-*.yaml")
+	require.NoError(t, err)
+	defer func() {
+		_ = os.Remove(f.Name())
+	}()
+
+	_, err = f.Write([]byte(`
+foo: bar
+fii: bir
+yi: {}
+`))
+	require.NoError(t, err)
+
+	element := &Yo{
+		Fuu: "test",
+	}
+
+	err = Decode(f.Name(), element)
+	require.NoError(t, err)
+
+	expected := &Yo{
+		Foo: "bar",
+		Fii: "bir",
+		Fuu: "test",
+		Yi: &Yi{
+			Foo: "foo",
+			Fii: "fii",
+		},
+	}
+	assert.Equal(t, expected, element)
+}