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make NewBufRead etc. idempotent

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R=rsc
DELTA=63  (59 added, 0 deleted, 4 changed)
OCL=27143
CL=27143
This commit is contained in:
Rob Pike 2009-04-06 21:42:14 -07:00
parent ac6ebfdea9
commit ee19695cfc
2 changed files with 63 additions and 4 deletions
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47
src/lib/bufio_test.go
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@ -330,3 +330,50 @@ func TestBufWrite(t *testing.T) {
}
}
func TestNewBufReadSizeIdempotent(t *testing.T) {
const BufSize = 1000;
b, err := NewBufReadSize(newByteReader(io.StringBytes("hello world")), BufSize);
if err != nil {
t.Error("NewBufReadSize create fail", err);
}
// Does it recognize itself?
b1, err2 := NewBufReadSize(b, BufSize);
if err2 != nil {
t.Error("NewBufReadSize #2 create fail", err2);
}
if b1 != b {
t.Error("NewBufReadSize did not detect underlying BufRead");
}
// Does it wrap if existing buffer is too small?
b2, err3 := NewBufReadSize(b, 2*BufSize);
if err3 != nil {
t.Error("NewBufReadSize #3 create fail", err3);
}
if b2 == b {
t.Error("NewBufReadSize did not enlarge buffer");
}
}
func TestNewBufWriteSizeIdempotent(t *testing.T) {
const BufSize = 1000;
b, err := NewBufWriteSize(newByteWriter(), BufSize);
if err != nil {
t.Error("NewBufWriteSize create fail", err);
}
// Does it recognize itself?
b1, err2 := NewBufWriteSize(b, BufSize);
if err2 != nil {
t.Error("NewBufWriteSize #2 create fail", err2);
}
if b1 != b {
t.Error("NewBufWriteSize did not detect underlying BufWrite");
}
// Does it wrap if existing buffer is too small?
b2, err3 := NewBufWriteSize(b, 2*BufSize);
if err3 != nil {
t.Error("NewBufWriteSize #3 create fail", err3);
}
if b2 == b {
t.Error("NewBufWriteSize did not enlarge buffer");
}
}