[x/tour] pic: add a test

It's hard to write a normal test because ShowImage writes to os.Stdout unconditionally. Add an example test instead. Change-Id: I52e02908e94aa212a05c058edb4f504851b5bb8d Reviewed-on: https://go-review.googlesource.com/c/tour/+/232866 Run-TryBot: Dmitri Shuralyov <[email protected]> TryBot-Result: Gobot Gobot <[email protected]> Reviewed-by: Alexander Rakoczy <[email protected]> X-Tour-Commit: 6a4383abac21758536e477d3eed0a63ba560173c
golang · May 8, 2020 · 0f95301 · 0f95301
1 parent cc41fcf
commit 0f95301
Showing 1 changed file with 26 additions and 0 deletions.
diff --git a/tour/pic/pic_test.go b/tour/pic/pic_test.go
@@ -0,0 +1,26 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package pic_test
+
+import "golang.org/x/tour/pic"
+
+func ExampleShow() {
+	f := func(dx, dy int) [][]uint8 {
+		ss := make([][]uint8, dy)
+		for y := 0; y < dy; y++ {
+			s := make([]uint8, dx)
+			for x := 0; x < dx; x++ {
+				s[x] = uint8((x + y) / 2)
+			}
+			ss[y] = s
+		}
+		return ss
+	}
+
+	pic.Show(f)
+
+	// Output:
+	// IMAGE:iVBORw0KGgoAAAANSUhEUgAAAQAAAAEACAIAAADTED8xAAADKElEQVR4nOzVoRHAMAzAQCfX/VduxjDQk8di+mb+mTlnyKB3vYBc9K4XkIs6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANM6ANO+AAAA//9hKgMPVczXbQAAAABJRU5ErkJggg==
+}