tests: Added GetObject, DeleteObject and PutObject unit-tests (#2222)

faulty-disk_test.go

@@ -0,0 +1,115 @@
+/*
+ * Minio Cloud Storage, (C) 2016 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package main
+
+// Simulates disk returning errFaultyDisk on all methods of StorageAPI
+// interface after successCount number of successes.
+type faultyDisk struct {
+	disk         *posix
+	successCount int
+}
+
+// instantiates a faulty
+func newFaultyDisk(disk *posix, n int) *faultyDisk {
+	return &faultyDisk{disk: disk, successCount: n}
+}
+
+func (f *faultyDisk) MakeVol(volume string) (err error) {
+	if f.successCount > 0 {
+		f.successCount--
+		return f.disk.MakeVol(volume)
+	}
+	return errFaultyDisk
+}
+func (f *faultyDisk) ListVols() (vols []VolInfo, err error) {
+	if f.successCount > 0 {
+		f.successCount--
+		return f.disk.ListVols()
+	}
+	return nil, errFaultyDisk
+}
+
+func (f *faultyDisk) StatVol(volume string) (volInfo VolInfo, err error) {
+	if f.successCount > 0 {
+		f.successCount--
+		return f.disk.StatVol(volume)
+	}
+	return VolInfo{}, errFaultyDisk
+}
+func (f *faultyDisk) DeleteVol(volume string) (err error) {
+	if f.successCount > 0 {
+		f.successCount--
+		return f.disk.DeleteVol(volume)
+	}
+	return errFaultyDisk
+}
+
+func (f *faultyDisk) ListDir(volume, path string) (entries []string, err error) {
+	if f.successCount > 0 {
+		f.successCount--
+		return f.disk.ListDir(volume, path)
+	}
+	return []string{}, errFaultyDisk
+}
+
+func (f *faultyDisk) ReadFile(volume string, path string, offset int64, buf []byte) (n int64, err error) {
+	if f.successCount > 0 {
+		f.successCount--
+		return f.disk.ReadFile(volume, path, offset, buf)
+	}
+	return 0, errFaultyDisk
+}
+
+func (f *faultyDisk) AppendFile(volume, path string, buf []byte) error {
+	if f.successCount > 0 {
+		f.successCount--
+		return f.disk.AppendFile(volume, path, buf)
+	}
+	return errFaultyDisk
+}
+
+func (f *faultyDisk) RenameFile(srcVolume, srcPath, dstVolume, dstPath string) error {
+	if f.successCount > 0 {
+		f.successCount--
+		return f.disk.RenameFile(srcVolume, srcPath, dstVolume, dstPath)
+	}
+	return errFaultyDisk
+}
+
+func (f *faultyDisk) StatFile(volume string, path string) (file FileInfo, err error) {
+	if f.successCount > 0 {
+		f.successCount--
+		return f.disk.StatFile(volume, path)
+	}
+	return FileInfo{}, errFaultyDisk
+}
+
+func (f *faultyDisk) DeleteFile(volume string, path string) (err error) {
+	if f.successCount > 0 {
+		f.successCount--
+		return f.disk.DeleteFile(volume, path)
+	}
+	return errFaultyDisk
+}
+
+func (f *faultyDisk) ReadAll(volume string, path string) (buf []byte, err error) {
+	if f.successCount > 0 {
+		f.successCount--
+		return f.disk.ReadAll(volume, path)
+	}
+	return nil, errFaultyDisk
+}

object-api-putobject_test.go

@@ -20,13 +20,24 @@ import (
 	"bytes"
 	"crypto/md5"
 	"encoding/hex"
-	"fmt"
 	"io/ioutil"
 	"os"
 	"path"
 	"testing"
 )
 
+// md5Hex ignores error from Write method since it never returns one. Check
+// crypto/md5 doc for more details.
+func md5Hex(b []byte) string {
+	md5Writer := md5.New()
+	md5Writer.Write(b)
+	return hex.EncodeToString(md5Writer.Sum(nil))
+}
+
+func md5Header(data []byte) map[string]string {
+	return map[string]string{"md5Sum": md5Hex([]byte(data))}
+}
+
 // Wrapper for calling PutObject tests for both XL multiple disks and single node setup.
 func TestObjectAPIPutObject(t *testing.T) {
 	ExecObjectLayerTest(t, testObjectAPIPutObject)
@@ -52,71 +63,109 @@ func testObjectAPIPutObject(obj ObjectLayer, instanceType string, t TestErrHandl
 		t.Fatalf("%s : %s", instanceType, err.Error())
 	}
 
-	failCases := []struct {
+	var (
+		nilBytes    []byte
+		data        = []byte("hello")
+		fiveMBBytes = bytes.Repeat([]byte("a"), 5*1024*124)
+	)
+	invalidMD5 := md5Hex([]byte("meh"))
+	invalidMD5Header := md5Header([]byte("meh"))
+
+	testCases := []struct {
 		bucketName     string
 		objName        string
-		inputReaderData string
+		inputData      []byte
 		inputMeta      map[string]string
 		intputDataSize int64
-		// flag indicating whether the test should pass.
-		shouldPass bool
 		// expected error output.
 		expectedMd5   string
 		expectedError error
 	}{
 		// Test case  1-4.
 		// Cases with invalid bucket name.
-		{".test", "obj", "", nil, 0, false, "", fmt.Errorf("%s", "Bucket name invalid: .test")},
-		{"------", "obj", "", nil, 0, false, "", fmt.Errorf("%s", "Bucket name invalid: ------")},
-		{"$this-is-not-valid-too", "obj", "", nil, 0, false, "",
-			fmt.Errorf("%s", "Bucket name invalid: $this-is-not-valid-too")},
-		{"a", "obj", "", nil, 0, false, "", fmt.Errorf("%s", "Bucket name invalid: a")},
+		{".test", "obj", []byte(""), nil, 0, "", BucketNameInvalid{Bucket: ".test"}},
+		{"------", "obj", []byte(""), nil, 0, "", BucketNameInvalid{Bucket: "------"}},
+		{"$this-is-not-valid-too", "obj", []byte(""), nil, 0, "",
+			BucketNameInvalid{Bucket: "$this-is-not-valid-too"}},
+		{"a", "obj", []byte(""), nil, 0, "", BucketNameInvalid{Bucket: "a"}},
+
 		// Test case - 5.
 		// Case with invalid object names.
-		{bucket, "", "", nil, 0, false, "", fmt.Errorf("%s", "Object name invalid: minio-bucket#")},
+		{bucket, "", []byte(""), nil, 0, "", ObjectNameInvalid{Bucket: bucket, Object: ""}},
+
 		// Test case - 6.
 		// Valid object and bucket names but non-existent bucket.
-		{"abc", "def", "", nil, 0, false, "", fmt.Errorf("%s", "Bucket not found: abc")},
+		{"abc", "def", []byte(""), nil, 0, "", BucketNotFound{Bucket: "abc"}},
+
 		// Test case - 7.
 		// Input to replicate Md5 mismatch.
-		{bucket, object, "", map[string]string{"md5Sum": "a35"}, 0, false, "",
-			fmt.Errorf("%s", "Bad digest: Expected a35 is not valid with what we calculated "+"d41d8cd98f00b204e9800998ecf8427e")},
+		{bucket, object, []byte(""), map[string]string{"md5Sum": "a35"}, 0, "",
+			BadDigest{ExpectedMD5: "a35", CalculatedMD5: "d41d8cd98f00b204e9800998ecf8427e"}},
+
 		// Test case - 8.
 		// Input with size more than the size of actual data inside the reader.
-		{bucket, object, "abcd", map[string]string{"md5Sum": "a35"}, int64(len("abcd") + 1), false, "",
+		{bucket, object, []byte("abcd"), map[string]string{"md5Sum": "a35"}, int64(len("abcd") + 1), "",
 			IncompleteBody{}},
+
 		// Test case - 9.
 		// Input with size less than the size of actual data inside the reader.
-		{bucket, object, "abcd", map[string]string{"md5Sum": "a35"}, int64(len("abcd") - 1), false, "",
-			fmt.Errorf("%s", "Bad digest: Expected a35 is not valid with what we calculated 900150983cd24fb0d6963f7d28e17f72")},
+		{bucket, object, []byte("abcd"), map[string]string{"md5Sum": "a35"}, int64(len("abcd") - 1), "",
+			BadDigest{ExpectedMD5: "a35", CalculatedMD5: "900150983cd24fb0d6963f7d28e17f72"}},
+
 		// Test case - 10-13.
 		// Validating for success cases.
-		{bucket, object, "abcd", map[string]string{"md5Sum": "e2fc714c4727ee9395f324cd2e7f331f"}, int64(len("abcd")), true, "", nil},
-		{bucket, object, "efgh", map[string]string{"md5Sum": "1f7690ebdd9b4caf8fab49ca1757bf27"}, int64(len("efgh")), true, "", nil},
-		{bucket, object, "ijkl", map[string]string{"md5Sum": "09a0877d04abf8759f99adec02baf579"}, int64(len("ijkl")), true, "", nil},
-		{bucket, object, "mnop", map[string]string{"md5Sum": "e132e96a5ddad6da8b07bba6f6131fef"}, int64(len("mnop")), true, "", nil},
+		{bucket, object, []byte("abcd"), map[string]string{"md5Sum": "e2fc714c4727ee9395f324cd2e7f331f"}, int64(len("abcd")), "", nil},
+		{bucket, object, []byte("efgh"), map[string]string{"md5Sum": "1f7690ebdd9b4caf8fab49ca1757bf27"}, int64(len("efgh")), "", nil},
+		{bucket, object, []byte("ijkl"), map[string]string{"md5Sum": "09a0877d04abf8759f99adec02baf579"}, int64(len("ijkl")), "", nil},
+		{bucket, object, []byte("mnop"), map[string]string{"md5Sum": "e132e96a5ddad6da8b07bba6f6131fef"}, int64(len("mnop")), "", nil},
+
+		// Test case 14-16.
+		// With no metadata
+		{bucket, object, data, nil, int64(len(data)), md5Hex(data), nil},
+		{bucket, object, nilBytes, nil, int64(len(nilBytes)), md5Hex(nilBytes), nil},
+		{bucket, object, fiveMBBytes, nil, int64(len(fiveMBBytes)), md5Hex(fiveMBBytes), nil},
+
+		// Test case 17-19.
+		// With arbitrary metadata
+		{bucket, object, data, map[string]string{"answer": "42"}, int64(len(data)), md5Hex(data), nil},
+		{bucket, object, nilBytes, map[string]string{"answer": "42"}, int64(len(nilBytes)), md5Hex(nilBytes), nil},
+		{bucket, object, fiveMBBytes, map[string]string{"answer": "42"}, int64(len(fiveMBBytes)), md5Hex(fiveMBBytes), nil},
+
+		// Test case 20-22.
+		// With valid md5sum in header
+		{bucket, object, data, md5Header(data), int64(len(data)), md5Hex(data), nil},
+		{bucket, object, nilBytes, md5Header(nilBytes), int64(len(nilBytes)), md5Hex(nilBytes), nil},
+		{bucket, object, fiveMBBytes, md5Header(fiveMBBytes), int64(len(fiveMBBytes)), md5Hex(fiveMBBytes), nil},
+
+		// Test case 23-25.
+		// data with invalid md5sum in header
+		{bucket, object, data, invalidMD5Header, int64(len(data)), md5Hex(data), BadDigest{invalidMD5, md5Hex(data)}},
+		{bucket, object, nilBytes, invalidMD5Header, int64(len(nilBytes)), md5Hex(nilBytes), BadDigest{invalidMD5, md5Hex(nilBytes)}},
+		{bucket, object, fiveMBBytes, invalidMD5Header, int64(len(fiveMBBytes)), md5Hex(fiveMBBytes), BadDigest{invalidMD5, md5Hex(fiveMBBytes)}},
+
+		// Test case 26-28.
+		// data with size different from the actual number of bytes available in the reader
+		{bucket, object, data, nil, int64(len(data) - 1), md5Hex(data[:len(data)-1]), nil},
+		{bucket, object, nilBytes, nil, int64(len(nilBytes) + 1), md5Hex(nilBytes), IncompleteBody{}},
+		{bucket, object, fiveMBBytes, nil, int64(0), md5Hex(fiveMBBytes), nil},
 	}
 
-	for i, testCase := range failCases {
-		actualMd5Hex, actualErr := obj.PutObject(testCase.bucketName, testCase.objName, testCase.intputDataSize, bytes.NewBufferString(testCase.inputReaderData), testCase.inputMeta)
-		// All are test cases above are expected to fail.
-
-		if actualErr != nil && testCase.shouldPass {
-			t.Errorf("Test %d: %s: Expected to pass, but failed with: <ERROR> %s.", i+1, instanceType, actualErr.Error())
+	for i, testCase := range testCases {
+		actualMd5Hex, actualErr := obj.PutObject(testCase.bucketName, testCase.objName, testCase.intputDataSize, bytes.NewReader(testCase.inputData), testCase.inputMeta)
+		if actualErr != nil && testCase.expectedError == nil {
+			t.Errorf("Test %d: %s: Expected to pass, but failed with: error %s.", i+1, instanceType, actualErr.Error())
 		}
-		if actualErr == nil && !testCase.shouldPass {
-			t.Errorf("Test %d: %s: Expected to fail with <ERROR> \"%s\", but passed instead.", i+1, instanceType, testCase.expectedError.Error())
+		if actualErr == nil && testCase.expectedError != nil {
+			t.Errorf("Test %d: %s: Expected to fail with error \"%s\", but passed instead.", i+1, instanceType, testCase.expectedError.Error())
 		}
 		// Failed as expected, but does it fail for the expected reason.
-		if actualErr != nil && !testCase.shouldPass {
-			if testCase.expectedError.Error() != actualErr.Error() {
+		if actualErr != nil && testCase.expectedError != actualErr {
 			t.Errorf("Test %d: %s: Expected to fail with error \"%s\", but instead failed with error \"%s\" instead.", i+1, instanceType, testCase.expectedError.Error(), actualErr.Error())
 		}
-		}
 		// Test passes as expected, but the output values are verified for correctness here.
-		if actualErr == nil && testCase.shouldPass {
+		if actualErr == nil {
 			// Asserting whether the md5 output is correct.
-			if testCase.inputMeta["md5Sum"] != actualMd5Hex {
+			if expectedMD5, ok := testCase.inputMeta["md5Sum"]; ok && expectedMD5 != actualMd5Hex {
 				t.Errorf("Test %d: %s: Calculated Md5 different from the actual one %s.", i+1, instanceType, actualMd5Hex)
 			}
 		}
@@ -157,7 +206,7 @@ func testObjectAPIPutObjectDiskNotFOund(obj ObjectLayer, instanceType string, di
 	testCases := []struct {
 		bucketName     string
 		objName        string
-		inputReaderData string
+		inputData      []byte
 		inputMeta      map[string]string
 		intputDataSize int64
 		// flag indicating whether the test should pass.
@@ -167,14 +216,14 @@ func testObjectAPIPutObjectDiskNotFOund(obj ObjectLayer, instanceType string, di
 		expectedError error
 	}{
 		// Validating for success cases.
-		{bucket, object, "abcd", map[string]string{"md5Sum": "e2fc714c4727ee9395f324cd2e7f331f"}, int64(len("abcd")), true, "", nil},
-		{bucket, object, "efgh", map[string]string{"md5Sum": "1f7690ebdd9b4caf8fab49ca1757bf27"}, int64(len("efgh")), true, "", nil},
-		{bucket, object, "ijkl", map[string]string{"md5Sum": "09a0877d04abf8759f99adec02baf579"}, int64(len("ijkl")), true, "", nil},
-		{bucket, object, "mnop", map[string]string{"md5Sum": "e132e96a5ddad6da8b07bba6f6131fef"}, int64(len("mnop")), true, "", nil},
+		{bucket, object, []byte("abcd"), map[string]string{"md5Sum": "e2fc714c4727ee9395f324cd2e7f331f"}, int64(len("abcd")), true, "", nil},
+		{bucket, object, []byte("efgh"), map[string]string{"md5Sum": "1f7690ebdd9b4caf8fab49ca1757bf27"}, int64(len("efgh")), true, "", nil},
+		{bucket, object, []byte("ijkl"), map[string]string{"md5Sum": "09a0877d04abf8759f99adec02baf579"}, int64(len("ijkl")), true, "", nil},
+		{bucket, object, []byte("mnop"), map[string]string{"md5Sum": "e132e96a5ddad6da8b07bba6f6131fef"}, int64(len("mnop")), true, "", nil},
 	}
 
 	for i, testCase := range testCases {
-		actualMd5Hex, actualErr := obj.PutObject(testCase.bucketName, testCase.objName, testCase.intputDataSize, bytes.NewBufferString(testCase.inputReaderData), testCase.inputMeta)
+		actualMd5Hex, actualErr := obj.PutObject(testCase.bucketName, testCase.objName, testCase.intputDataSize, bytes.NewReader(testCase.inputData), testCase.inputMeta)
 		if actualErr != nil && testCase.shouldPass {
 			t.Errorf("Test %d: %s: Expected to pass, but failed with: <ERROR> %s.", i+1, instanceType, actualErr.Error())
 		}
@@ -204,7 +253,7 @@ func testObjectAPIPutObjectDiskNotFOund(obj ObjectLayer, instanceType string, di
 	testCase := struct {
 		bucketName     string
 		objName        string
-		inputReaderData string
+		inputData      []byte
 		inputMeta      map[string]string
 		intputDataSize int64
 		// flag indicating whether the test should pass.
@@ -215,14 +264,14 @@ func testObjectAPIPutObjectDiskNotFOund(obj ObjectLayer, instanceType string, di
 	}{
 		bucket,
 		object,
-		"mnop",
+		[]byte("mnop"),
 		map[string]string{"md5Sum": "e132e96a5ddad6da8b07bba6f6131fef"},
 		int64(len("mnop")),
 		false,
 		"",
 		InsufficientWriteQuorum{},
 	}
-	_, actualErr := obj.PutObject(testCase.bucketName, testCase.objName, testCase.intputDataSize, bytes.NewBufferString(testCase.inputReaderData), testCase.inputMeta)
+	_, actualErr := obj.PutObject(testCase.bucketName, testCase.objName, testCase.intputDataSize, bytes.NewReader(testCase.inputData), testCase.inputMeta)
 	if actualErr != nil && testCase.shouldPass {
 		t.Errorf("Test %d: %s: Expected to pass, but failed with: <ERROR> %s.", len(testCases)+1, instanceType, actualErr.Error())
 	}

xl-v1-object_test.go

@@ -20,6 +20,7 @@ import (
 	"bytes"
 	"crypto/md5"
 	"encoding/hex"
+	"io/ioutil"
 	"testing"
 )
 
@@ -60,3 +61,186 @@ func TestRepeatPutObjectPart(t *testing.T) {
 	}
 
 }
+
+func TestXLDeleteObjectBasic(t *testing.T) {
+	testCases := []struct {
+		bucket      string
+		object      string
+		expectedErr error
+	}{
+		{".test", "obj", BucketNameInvalid{Bucket: ".test"}},
+		{"----", "obj", BucketNameInvalid{Bucket: "----"}},
+		{"bucket", "", ObjectNameInvalid{Bucket: "bucket", Object: ""}},
+		{"bucket", "obj/", ObjectNameInvalid{Bucket: "bucket", Object: "obj/"}},
+		{"bucket", "/obj", ObjectNameInvalid{Bucket: "bucket", Object: "/obj"}},
+		{"bucket", "doesnotexist", ObjectNotFound{Bucket: "bucket", Object: "doesnotexist"}},
+		{"bucket", "obj", nil},
+	}
+
+	// Create an instance of xl backend
+	xl, fsDirs, err := getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Make bucket for Test 7 to pass
+	err = xl.MakeBucket("bucket")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Create object "obj" under bucket "bucket" for Test 7 to pass
+	_, err = xl.PutObject("bucket", "obj", int64(len("abcd")), bytes.NewReader([]byte("abcd")), nil)
+
+	for i, test := range testCases {
+		actualErr := xl.DeleteObject(test.bucket, test.object)
+		if test.expectedErr != nil && actualErr != test.expectedErr {
+			t.Errorf("Test %d: Expected to fail with %s, but failed with %s", i+1, test.expectedErr, actualErr)
+		}
+		if test.expectedErr == nil && actualErr != nil {
+			t.Errorf("Test %d: Expected to pass, but failed with %s", i+1, actualErr)
+		}
+	}
+	// Cleanup backend directories
+	removeRoots(fsDirs)
+}
+
+func TestXLDeleteObjectDiskNotFound(t *testing.T) {
+	// Create an instance of xl backend.
+	obj, fsDirs, err := getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	xl := obj.(xlObjects)
+
+	// Create "bucket"
+	err = obj.MakeBucket("bucket")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	bucket := "bucket"
+	object := "object"
+	// Create object "obj" under bucket "bucket".
+	_, err = obj.PutObject(bucket, object, int64(len("abcd")), bytes.NewReader([]byte("abcd")), nil)
+
+	// for a 16 disk setup, quorum is 9. To simulate disks not found yet
+	// quorum is available, we remove disks leaving quorum disks behind.
+	for i := range xl.storageDisks[:7] {
+		xl.storageDisks[i] = newFaultyDisk(xl.storageDisks[i].(*posix), 0)
+	}
+	err = obj.DeleteObject(bucket, object)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Create "obj" under "bucket".
+	_, err = obj.PutObject(bucket, object, int64(len("abcd")), bytes.NewReader([]byte("abcd")), nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Remove one more disk to 'lose' quorum, by setting it to nil.
+	xl.storageDisks[7] = &faultyDisk{}
+	xl.storageDisks[8] = &faultyDisk{}
+	err = obj.DeleteObject(bucket, object)
+	if err != toObjectErr(errXLWriteQuorum, bucket, object) {
+		t.Errorf("Expected deleteObject to fail with %v, but failed with %v", toObjectErr(errXLWriteQuorum, bucket, object), err)
+	}
+	// Cleanup backend directories
+	removeRoots(fsDirs)
+}
+
+func TestGetObjectNoQuorum(t *testing.T) {
+	// Create an instance of xl backend.
+	obj, fsDirs, err := getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	xl := obj.(xlObjects)
+
+	// Create "bucket"
+	err = obj.MakeBucket("bucket")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	bucket := "bucket"
+	object := "object"
+	// Create "object" under "bucket".
+	_, err = obj.PutObject(bucket, object, int64(len("abcd")), bytes.NewReader([]byte("abcd")), nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	// Disable caching to avoid returning early and not covering other code-paths
+	xl.objCacheEnabled = false
+	// Make 9 disks offline, which leaves less than quorum number of disks
+	// in a 16 disk XL setup. The original disks are 'replaced' with
+	// faultyDisks that fail after 'f' successful StorageAPI method
+	// invocations, where f - [0,2)
+	for f := 0; f < 2; f++ {
+		for i := range xl.storageDisks[:9] {
+			switch diskType := xl.storageDisks[i].(type) {
+			case *posix:
+				xl.storageDisks[i] = newFaultyDisk(diskType, f)
+			case *faultyDisk:
+				xl.storageDisks[i] = newFaultyDisk(diskType.disk, f)
+			}
+		}
+		// Fetch object from store.
+		err = xl.GetObject(bucket, object, 0, int64(len("abcd")), ioutil.Discard)
+		if err != toObjectErr(errXLReadQuorum, bucket, object) {
+			t.Errorf("Expected putObject to fail with %v, but failed with %v", toObjectErr(errXLWriteQuorum, bucket, object), err)
+		}
+	}
+	// Cleanup backend directories.
+	removeRoots(fsDirs)
+}
+
+func TestPutObjectNoQuorum(t *testing.T) {
+	// Create an instance of xl backend.
+	obj, fsDirs, err := getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	xl := obj.(xlObjects)
+
+	// Create "bucket"
+	err = obj.MakeBucket("bucket")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	bucket := "bucket"
+	object := "object"
+	// Create "object" under "bucket".
+	_, err = obj.PutObject(bucket, object, int64(len("abcd")), bytes.NewReader([]byte("abcd")), nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Make 9 disks offline, which leaves less than quorum number of disks
+	// in a 16 disk XL setup. The original disks are 'replaced' with
+	// faultyDisks that fail after 'f' successful StorageAPI method
+	// invocations, where f - [0,3)
+	for f := 0; f < 3; f++ {
+		for i := range xl.storageDisks[:9] {
+			switch diskType := xl.storageDisks[i].(type) {
+			case *posix:
+				xl.storageDisks[i] = newFaultyDisk(diskType, f)
+			case *faultyDisk:
+				xl.storageDisks[i] = newFaultyDisk(diskType.disk, f)
+			}
+		}
+		// Upload new content to same object "object"
+		_, err = obj.PutObject(bucket, object, int64(len("abcd")), bytes.NewReader([]byte("abcd")), nil)
+		if err != toObjectErr(errXLWriteQuorum, bucket, object) {
+			t.Errorf("Expected putObject to fail with %v, but failed with %v", toObjectErr(errXLWriteQuorum, bucket, object), err)
+		}
+	}
+	// Cleanup backend directories.
+	removeRoots(fsDirs)
+}