From: jiahua wang <wjh180909@gmail.com>
Date: Thu, 7 Oct 2021 07:30:03 +0000 (+0800)
Subject: unicode/utf8: add AppendRune Example
X-Git-Tag: go1.18beta1~487
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=75952abc6a8a8ad09e6bb1966c66b9a68b5d6c4e;p=gostls13.git

unicode/utf8: add AppendRune Example

Also, correct TestAppendRune error message.

Change-Id: I3ca3ac7051af1ae6d449381b78efa86c2f6be8ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/354529
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Trust: Robert Findley <rfindley@google.com>
Trust: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
---

diff --git a/src/unicode/utf8/example_test.go b/src/unicode/utf8/example_test.go
index 5cd931d242..fe434c9476 100644
--- a/src/unicode/utf8/example_test.go
+++ b/src/unicode/utf8/example_test.go
@@ -214,3 +214,13 @@ func ExampleValidString() {
 	// true
 	// false
 }
+
+func ExampleAppendRune() {
+	buf1 := utf8.AppendRune(nil, 0x10000)
+	buf2 := utf8.AppendRune([]byte("init"), 0x10000)
+	fmt.Println(string(buf1))
+	fmt.Println(string(buf2))
+	// Output:
+	// 𐀀
+	// init𐀀
+}
diff --git a/src/unicode/utf8/utf8_test.go b/src/unicode/utf8/utf8_test.go
index a60040ecfd..e9be4d2d63 100644
--- a/src/unicode/utf8/utf8_test.go
+++ b/src/unicode/utf8/utf8_test.go
@@ -133,7 +133,7 @@ func TestAppendRune(t *testing.T) {
 			t.Errorf("AppendRune(nil, %#04x) = %s, want %s", m.r, buf, m.str)
 		}
 		if buf := AppendRune([]byte("init"), m.r); string(buf) != "init"+m.str {
-			t.Errorf("AppendRune(nil, %#04x) = %s, want %s", m.r, buf, "init"+m.str)
+			t.Errorf("AppendRune(init, %#04x) = %s, want %s", m.r, buf, "init"+m.str)
 		}
 	}
 }