github.com/gofunct/common@v0.0.0-20190131174352-fd058c7fbf22/pkg/temp/temptest/file_test.go (about) 1 package temptest 2 3 import ( 4 "io" 5 "testing" 6 ) 7 8 func TestFakeFile(t *testing.T) { 9 f := &FakeFile{} 10 11 n, err := io.WriteString(f, "Bonjour!") 12 if n != 8 || err != nil { 13 t.Fatalf( 14 `WriteString(f, "Bonjour!") = (%v, %v), expected (%v, %v)`, 15 n, err, 16 8, nil, 17 ) 18 } 19 20 err = f.Close() 21 if err != nil { 22 t.Fatal(err) 23 } 24 25 // File can't be closed twice. 26 err = f.Close() 27 if err == nil { 28 t.Fatal("FakeFile could be closed twice") 29 } 30 31 // File is not writable after close. 32 n, err = io.WriteString(f, "Bonjour!") 33 if n != 0 || err == nil { 34 t.Fatalf( 35 `WriteString(f, "Bonjour!") = (%v, %v), expected (%v, %v)`, 36 n, err, 37 0, "non-nil", 38 ) 39 } 40 }