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os: add tests for operations on nil *File methods

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R=shawn.p.smith, gobot, r
CC=golang-codereviews
https://golang.org/cl/46820043
This commit is contained in:
Dave Cheney 2014-01-04 09:58:04 +11:00
parent f2e946f9ed
commit 30ba286c61
1 changed files with 32 additions and 14 deletions
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46
src/pkg/os/os_test.go
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@ -252,25 +252,11 @@ func TestReaddirnames(t *testing.T) {
testReaddirnames(sysdir.name, sysdir.files, t)
}
func TestReaddirnamesNilFile(t *testing.T) {
var f *File
if fi, err := f.Readdirnames(1); fi != nil || err != ErrInvalid {
t.Errorf("Readdirnames should fail when f is nil: %v, %v", fi, err)
}
}
func TestReaddir(t *testing.T) {
testReaddir(".", dot, t)
testReaddir(sysdir.name, sysdir.files, t)
}
func TestReaddirNilFile(t *testing.T) {
var f *File
if fi, err := f.Readdir(1); fi != nil || err != ErrInvalid {
t.Errorf("Readdir should fail when f is nil: %v, %v", fi, err)
}
}
// Read the directory one entry at a time.
func smallReaddirnames(file *File, length int, t *testing.T) []string {
names := make([]string, length)
@ -1305,3 +1291,35 @@ func TestKillFindProcess(t *testing.T) {
}
})
}
var nilFileMethodTests = []struct {
name string
f func(*File) error
}{
{"Chdir", func(f *File) error { return f.Chdir() }},
{"Close", func(f *File) error { return f.Close() }},
{"Chmod", func(f *File) error { return f.Chmod(0) }},
{"Chown", func(f *File) error { return f.Chown(0, 0) }},
{"Read", func(f *File) error { _, err := f.Read(make([]byte, 0)); return err }},
{"ReadAt", func(f *File) error { _, err := f.ReadAt(make([]byte, 0), 0); return err }},
{"Readdir", func(f *File) error { _, err := f.Readdir(1); return err }},
{"Readdirnames", func(f *File) error { _, err := f.Readdirnames(1); return err }},
{"Seek", func(f *File) error { _, err := f.Seek(0, 0); return err }},
{"Stat", func(f *File) error { _, err := f.Stat(); return err }},
{"Sync", func(f *File) error { return f.Sync() }},
{"Truncate", func(f *File) error { return f.Truncate(0) }},
{"Write", func(f *File) error { _, err := f.Write(make([]byte, 0)); return err }},
{"WriteAt", func(f *File) error { _, err := f.WriteAt(make([]byte, 0), 0); return err }},
{"WriteString", func(f *File) error { _, err := f.WriteString(""); return err }},
}
// Test that all File methods give ErrInvalid if the receiver is nil.
func TestNilFileMethods(t *testing.T) {
for _, tt := range nilFileMethodTests {
var file *File
got := tt.f(file)
if got != ErrInvalid {
t.Errorf("%v should fail when f is nil; got %v", tt.name, got)
}
}
}