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Editing: writer_test.go
// Copyright 2019 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 iotest import ( "strings" "testing" ) var truncateWriterTests = []struct { in string want string trunc int64 n int }{ {"hello", "", -1, 5}, {"world", "", 0, 5}, {"abcde", "abc", 3, 5}, {"edcba", "edcba", 7, 5}, } func TestTruncateWriter(t *testing.T) { for _, tt := range truncateWriterTests { buf := new(strings.Builder) tw := TruncateWriter(buf, tt.trunc) n, err := tw.Write([]byte(tt.in)) if err != nil { t.Errorf("Unexpected error %v for\n\t%+v", err, tt) } if g, w := buf.String(), tt.want; g != w { t.Errorf("got %q, expected %q", g, w) } if g, w := n, tt.n; g != w { t.Errorf("read %d bytes, but expected to have read %d bytes for\n\t%+v", g, w, tt) } } }
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