fix: rename to failreader

Signed-off-by: Carlos Alexandro Becker <caarlos0@gmail.com>

Author: caarlos0

src/testing/iotest/reader.go

@@ -91,13 +91,13 @@ func (r *timeoutReader) Read(p []byte) (int, error) {
 // ErrIO is a fake IO error
 var ErrIO = errors.New("fake io error")
 
-// FailReader returns a fake error every time it is read from.
-func FailReader() io.Reader {
-	return &failReader{}
+// ErrReader returns a fake error every time it is read from.
+func ErrReader() io.Reader {
+	return &errReader{}
 }
 
-type failReader struct{}
+type errReader struct{}
 
-func (r *failReader) Read(p []byte) (int, error) {
+func (r *errReader) Read(p []byte) (int, error) {
 	return 0, ErrIO
 }

src/testing/iotest/reader_test.go

@@ -225,12 +225,12 @@ func TestDataErrReader_emptyReader(t *testing.T) {
 	}
 }
 
-func TestFailReader(t *testing.T) {
-	read, err := FailReader().Read([]byte{})
+func TestErrReader(t *testing.T) {
+	read, err := ErrReader().Read([]byte{})
 	if err != ErrIO {
-		t.Errorf("FailReader.Read(any) should have returned ErrIO, returned %v", err)
+		t.Errorf("ErrReader.Read(any) should have returned ErrIO, returned %v", err)
 	}
 	if read != 0 {
-		t.Errorf("FailReader.Read(any) should have read 0 bytes, read %v", read)
+		t.Errorf("ErrReader.Read(any) should have read 0 bytes, read %v", read)
 	}
-}
+}