{
			queryParams: map[string]string{
				"Expires":        "60",
				"Signature":      "badsignature",
				"AWSAccessKeyId": "Z7IXGOO6BZ0REAN1Q26I",
			},
			expected: ErrInvalidAccessKeyID,
		},
		// (2) Should error with malformed expires.
		{
			queryParams: map[string]string{
				"Expires":        "60s",
				"Signature":      "badsignature",
				"AWSAccessKeyId": accessKey,
			},
			expected: ErrMalformedExpires,
		},

		{
			queryParams: map[string]string{
				"X-Amz-Algorithm":     signV4Algorithm,
				"X-Amz-Date":          now.Format(iso8601Format),
				"X-Amz-Expires":       "60",
				"X-Amz-Signature":     "badsignature",
				"X-Amz-SignedHeaders": "host;x-amz-content-sha256;x-amz-date",
				"X-Amz-Credential":    fmt.Sprintf(credentialTemplate, "Z7IXGOO6BZ0REAN1Q26I", now.Format(yyyymmdd), "us-west-1"),
			},
			region:   "us-west-1",

)

// Type to capture different modifications to API request to simulate failure cases.
type Fault int

const (
	None Fault = iota
	MissingContentLength
	TooBigObject
	TooBigDecodedLength
	BadSignature
	BadMD5
	MissingUploadID
)

// Wrapper for calling HeadObject API handler tests for both Erasure multiple disks and FS single drive setup.
func TestAPIHeadObjectHandler(t *testing.T) {