lang/i18n: Fix for language code case issue with pt-br etc.

Fixes #7804

hugolib/language_test.go

@@ -0,0 +1,57 @@
+// Copyright 2020 The Hugo Authors. All rights reserved.
+//
+// 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 hugolib
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+
+	"github.com/gohugoio/hugo/htesting"
+
+	qt "github.com/frankban/quicktest"
+)
+
+func TestI18n(t *testing.T) {
+
+	c := qt.New(t)
+
+	//https://github.com/gohugoio/hugo/issues/7804
+	c.Run("pt-br should be case insensitive", func(c *qt.C) {
+		b := newTestSitesBuilder(c)
+		langCode := func() string {
+			c := "pt-br"
+			if htesting.RandBool() {
+				c = strings.ToUpper(c)
+			}
+			return c
+		}
+
+		b.WithConfigFile(`toml`, fmt.Sprintf(`
+baseURL = "https://example.com"
+defaultContentLanguage = "%s"
+
+[languages]
+[languages.%s]
+weight = 1
+`, langCode(), langCode()))
+
+		b.WithI18n(fmt.Sprintf("i18n/%s.toml", langCode()), `hello.one = "Hello"`)
+		b.WithTemplates("index.html", `Hello: {{ i18n "hello" 1 }}`)
+		b.WithContent("p1.md", "")
+		b.Build(BuildCfg{})
+
+		b.AssertFileContent("public/index.html", "Hello: Hello")
+	})
+}