Create own plurals subpackage

fix Typo

plurals/compiler_test.go

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2018 DeineAgentur UG https://www.deineagentur.com. All rights reserved.
+ * Licensed under the MIT License. See LICENSE file in the project root for full license information.
+ */
+
+package plurals
+
+import (
+	"encoding/json"
+	"os"
+	"testing"
+)
+
+type fixture struct {
+	PluralForm string
+	Fixture    []int
+}
+
+func TestCompiler(t *testing.T) {
+	f, err := os.Open("testdata/pluralforms.json")
+	if err != nil {
+		t.Fatal(err)
+	}
+	dec := json.NewDecoder(f)
+	var fixtures []fixture
+	err = dec.Decode(&fixtures)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, data := range fixtures {
+		expr, err := Compile(data.PluralForm)
+		if err != nil {
+			t.Errorf("'%s' triggered error: %s", data.PluralForm, err)
+		} else if expr == nil {
+			t.Logf("'%s' compiled to nil", data.PluralForm)
+			t.Fail()
+		} else {
+			for n, e := range data.Fixture {
+				i := expr.Eval(uint32(n))
+				if i != e {
+					t.Logf("'%s' with n = %d, expected %d, got %d, compiled to %s", data.PluralForm, n, e, i, expr)
+					t.Fail()
+				}
+				if i == -1 {
+					break
+				}
+			}
+		}
+	}
+}