add unit-tests (#137)

reader_test.go

@@ -0,0 +1,40 @@
+package xml
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestReader_Read(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    []byte
+		expected []byte
+	}{
+		{
+			name:     "with replacement",
+			input:    []byte(`<?xml version="1.1" encoding="UTF-8"?><root name="NAME"><item>ITEM</item></root>`),
+			expected: []byte(`<?xml version="1.0" encoding="UTF-8"?><root name="NAME"><item>ITEM</item></root>`),
+		},
+		{
+			name:     "without replacement",
+			input:    []byte(`<?xml version="1.0" encoding="UTF-8"?><root name="NAME"><item>ITEM</item></root>`),
+			expected: []byte(`<?xml version="1.0" encoding="UTF-8"?><root name="NAME"><item>ITEM</item></root>`),
+		},
+		{
+			name:     "check invalid replacement",
+			input:    []byte(`<?xml version="1.0" encoding="UTF-8"?><root version="1.1"><item>ITEM</item></root>`),
+			expected: []byte(`<?xml version="1.0" encoding="UTF-8"?><root version="1.1"><item>ITEM</item></root>`),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			buf := make([]byte, len(tt.input))
+			n, err := newReader(tt.input).Read(buf)
+			require.NoError(t, err)
+			require.Equal(t, tt.expected, buf[:n])
+		})
+	}
+}