feat: Replace data fillcontent with custom reader

content_test.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"io"
+	"testing"
+)
+
+func Test_contentReader_Read(t *testing.T) {
+	tests := []struct {
+		name    string
+		size    int64
+		content string
+	}{
+		{
+			name:    "simple",
+			size:    40,
+			content: "|ABCDEFGHIJKLMNOPQRSTUVWXYZ-ABCDEFGHIJK|",
+		},
+	}
+
+	for _, test := range tests {
+		test := test
+		t.Run(test.name, func(t *testing.T) {
+			t.Parallel()
+
+			d := &contentReader{size: test.size}
+
+			b, err := io.ReadAll(d)
+			if err != nil {
+				t.Errorf("contentReader.Read() error = %v", err)
+				return
+			}
+
+			if string(b) != test.content {
+				t.Errorf("return content does not match expected value: got %s want %s", b, test.content)
+			}
+		})
+	}
+}
+
+func Test_contentReader_ReadSeek(t *testing.T) {
+	tests := []struct {
+		name       string
+		offset     int64
+		seekWhence int
+		size       int64
+		content    string
+	}{
+		{
+			name:       "simple",
+			offset:     10,
+			seekWhence: io.SeekCurrent,
+			size:       40,
+			content:    "JKLMNOPQRSTUVWXYZ-ABCDEFGHIJK|",
+		},
+	}
+
+	for _, test := range tests {
+		test := test
+		t.Run(test.name, func(t *testing.T) {
+			t.Parallel()
+
+			d := &contentReader{size: test.size}
+
+			_, err := d.Seek(test.offset, test.seekWhence)
+			if err != nil {
+				t.Errorf("contentReader.Seek() error = %v", err)
+				return
+			}
+
+			b, err := io.ReadAll(d)
+			if err != nil {
+				t.Errorf("contentReader.Read() error = %v", err)
+				return
+			}
+
+			if string(b) != test.content {
+				t.Errorf("return content does not match expected value: got %s want %s", b, test.content)
+			}
+		})
+	}
+}