/*
 *
 * Copyright 2014, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

package metadata

import (
	"reflect"
	"testing"
)

func TestPairsMD(t *testing.T) {
	for _, test := range []struct {
		// input
		kv []string
		// output
		md MD
	}{
		{[]string{}, MD{}},
		{[]string{"k1", "v1", "k1", "v2"}, MD{"k1": []string{"v1", "v2"}}},
	} {
		md := Pairs(test.kv...)
		if !reflect.DeepEqual(md, test.md) {
			t.Fatalf("Pairs(%v) = %v, want %v", test.kv, md, test.md)
		}
	}
}

func TestCopy(t *testing.T) {
	const key, val = "key", "val"
	orig := Pairs(key, val)
	copy := orig.Copy()
	if !reflect.DeepEqual(orig, copy) {
		t.Errorf("copied value not equal to the original, got %v, want %v", copy, orig)
	}
	orig[key][0] = "foo"
	if v := copy[key][0]; v != val {
		t.Errorf("change in original should not affect copy, got %q, want %q", v, val)
	}
}

func TestJoin(t *testing.T) {
	for _, test := range []struct {
		mds  []MD
		want MD
	}{
		{[]MD{}, MD{}},
		{[]MD{Pairs("foo", "bar")}, Pairs("foo", "bar")},
		{[]MD{Pairs("foo", "bar"), Pairs("foo", "baz")}, Pairs("foo", "bar", "foo", "baz")},
		{[]MD{Pairs("foo", "bar"), Pairs("foo", "baz"), Pairs("zip", "zap")}, Pairs("foo", "bar", "foo", "baz", "zip", "zap")},
	} {
		md := Join(test.mds...)
		if !reflect.DeepEqual(md, test.want) {
			t.Errorf("context's metadata is %v, want %v", md, test.want)
		}
	}
}