added Check func test

main_test.go

@@ -6,6 +6,8 @@ import (
         "github.com/oschwald/maxminddb-golang"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+        "bytes"
+        "errors"
         "fmt"
 	"os"
 	"testing"
@@ -17,6 +19,49 @@ const (
 	TestDataset   = "./testdata/dataset.json"
 )
 
+func captureOutput(f func()) string {
+    // Create a pipe to capture the output
+    r, w, _ := os.Pipe()
+    // Save the original stdout
+    stdout := os.Stdout
+    // Set stdout to the write end of the pipe
+    os.Stdout = w
+
+    // Run the function (which will print to stdout)
+    f()
+
+    // Close the writer end and restore stdout
+    w.Close()
+    os.Stdout = stdout
+
+    // Read the captured output from the read end of the pipe
+    var buf bytes.Buffer
+    buf.ReadFrom(r)
+
+    return buf.String()
+}
+
+func TestCheck(t *testing.T) {
+    output := captureOutput(func() {
+        Check(func() error {
+            return nil
+        })
+    })
+
+    // Check that there was no output (since no error should be printed)
+    assert.Empty(t, output)
+
+    output = captureOutput(func() {
+        Check(func() error {
+            return errors.New("test error")
+        })
+    })
+
+    // Check that the error message was printed
+    expectedOutput := "Received error: test error\n"
+    assert.Equal(t, expectedOutput, output)
+}
+
 func TestToMMDBType(t *testing.T) {
     tests := []struct {
         key         string