fix: make azure gateway chunk size configurable (#9292)

cmd/gateway/azure/gateway-azure_test.go

@@ -19,8 +19,11 @@ package azure
 import (
 	"encoding/base64"
 	"fmt"
+	"github.com/dustin/go-humanize"
 	"net/http"
+	"os"
 	"reflect"
+	"strconv"
 	"testing"
 
 	"github.com/Azure/azure-storage-blob-go/azblob"
@@ -301,3 +304,36 @@ func TestCheckAzureUploadID(t *testing.T) {
 		}
 	}
 }
+
+func TestParsingUploadChunkSize(t *testing.T) {
+	key := "MINIO_AZURE_CHUNK_SIZE_MB"
+	invalidValues := []string{
+		"",
+		"0,3",
+		"100.1",
+		"-1",
+	}
+
+	for i, chunkValue := range invalidValues {
+		os.Setenv(key, chunkValue)
+		result := getUploadChunkSizeFromEnv(key, strconv.Itoa(azureDefaultUploadChunkSize/humanize.MiByte))
+		if result != azureDefaultUploadChunkSize {
+			t.Errorf("Test %d: expected: %d, got: %d", i+1, azureDefaultUploadChunkSize, result)
+		}
+	}
+
+	validValues := []string{
+		"1",
+		"1.25",
+		"50",
+		"99",
+	}
+	for i, chunkValue := range validValues {
+		os.Setenv(key, chunkValue)
+		result := getUploadChunkSizeFromEnv(key, strconv.Itoa(azureDefaultUploadChunkSize/humanize.MiByte))
+		if result == azureDefaultUploadChunkSize {
+			t.Errorf("Test %d: expected: %d, got: %d", i+1, azureDefaultUploadChunkSize, result)
+		}
+	}
+
+}