writer_test.go

Documentation: testing/iotest

		 1  // Copyright 2019 The Go Authors. All rights reserved.
		 2  // Use of this source code is governed by a BSD-style
		 3  // license that can be found in the LICENSE file.
		 4  
		 5  package iotest
		 6  
		 7  import (
		 8  	"bytes"
		 9  	"testing"
		10  )
		11  
		12  var truncateWriterTests = []struct {
		13  	in		string
		14  	want	string
		15  	trunc int64
		16  	n		 int
		17  }{
		18  	{"hello", "", -1, 5},
		19  	{"world", "", 0, 5},
		20  	{"abcde", "abc", 3, 5},
		21  	{"edcba", "edcba", 7, 5},
		22  }
		23  
		24  func TestTruncateWriter(t *testing.T) {
		25  	for _, tt := range truncateWriterTests {
		26  		buf := new(bytes.Buffer)
		27  		tw := TruncateWriter(buf, tt.trunc)
		28  		n, err := tw.Write([]byte(tt.in))
		29  		if err != nil {
		30  			t.Errorf("Unexpected error %v for\n\t%+v", err, tt)
		31  		}
		32  		if g, w := buf.String(), tt.want; g != w {
		33  			t.Errorf("got %q, expected %q", g, w)
		34  		}
		35  		if g, w := n, tt.n; g != w {
		36  			t.Errorf("read %d bytes, but expected to have read %d bytes for\n\t%+v", g, w, tt)
		37  		}
		38  	}
		39  }
		40
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