decode: Fix decoding an actively growing file

1 files changed, 14 insertions, 0 deletions

diff --git a/decode_test.go b/decode_test.go
index 73ce903..456f363 100644
--- a/decode_test.go
+++ b/decode_test.go
@@ -5,6 +5,7 @@
 package lowmemjson
 
 import (
+	"bytes"
 	"io"
 	"strings"
 	"testing"
@@ -34,3 +35,16 @@ func TestDecodeObject(t *testing.T) {
 		})
 	assert.ErrorContains(t, err, "did not consume entire")
 }
+
+func TestDecodeGrowing(t *testing.T) {
+	t.Parallel()
+	var buf bytes.Buffer
+	dec := NewDecoder(&buf)
+	var x any
+	assert.ErrorIs(t, dec.Decode(&x), io.EOF)
+	buf.WriteString("1\n")
+	assert.NoError(t, dec.Decode(&x))
+	buf.WriteString("1\n")
+	assert.NoError(t, dec.Decode(&x))
+	assert.ErrorIs(t, dec.Decode(&x), io.EOF)
+}