if (values == null) {
                // nothing
            } else if (values.length == 1) {
                queryBuf.append(' ').append(key).append(":\"").append(values[0]).append('\"');
            } else if (values.length > 1) {
                boolean first = true;
                queryBuf.append(" (");
                for (final String value : values) {
                    if (first) {
                        first = false;

        monitorTarget.append(buf, "key1", () -> "value1");
        buf.append(",");
        monitorTarget.append(buf, "key2", () -> 123);
        buf.append(",");
        monitorTarget.append(buf, "key3", () -> null);

        assertEquals("\"key1\":\"value1\",\"key2\":123,\"key3\":null", buf.toString());
    }

    // Test append with empty string
    public void test_append_emptyString() {

	o = msgp.Require(b, z.Msgsize())
	// map header, size 8
	// string "Bucket"
	o = append(o, 0x88, 0xa6, 0x42, 0x75, 0x63, 0x6b, 0x65, 0x74)
	o = msgp.AppendString(o, z.Bucket)
	// string "BaseDir"
	o = append(o, 0xa7, 0x42, 0x61, 0x73, 0x65, 0x44, 0x69, 0x72)
	o = msgp.AppendString(o, z.BaseDir)
	// string "Recursive"
	o = append(o, 0xa9, 0x52, 0x65, 0x63, 0x75, 0x72, 0x73, 0x69, 0x76, 0x65)
	o = msgp.AppendBool(o, z.Recursive)

        StringBuilder sb = new StringBuilder();
        sb.append(dm).append(createdTime);
        sb.append(dm).append(expiredTime);
        sb.append(dm).append(name);
        sb.append(dm).append(sessionId);
        if (sb.length() > dm.length()) {
            sb.delete(0, dm.length());
        }
        sb.insert(0, "{").append("}");
        return sb.toString();
    }

        StringBuilder sb = new StringBuilder();
        sb.append(dm).append(crawlingInfoId);
        sb.append(dm).append(createdTime);
        sb.append(dm).append(key);
        sb.append(dm).append(value);
        if (sb.length() > dm.length()) {
            sb.delete(0, dm.length());
        }
        sb.insert(0, "{").append("}");
        return sb.toString();
    }

        StringBuilder hashString = new StringBuilder(128);
        hashString.append(md.groupId).append('|');
        hashString.append(md.artifactId).append('|');

        if (compareVersion) {
            hashString.append(md.version).append('|');
        }

        if (compareScope) {
            hashString.append(md.getArtifactScope()).append('|');
        }

        return hashString.toString().hashCode();
    }

	o = msgp.Require(b, z.Msgsize())
	// map header, size 6
	// string "APIVersion"
	o = append(o, 0x86, 0xaa, 0x41, 0x50, 0x49, 0x56, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e)
	o = msgp.AppendString(o, z.APIVersion)
	// string "Bucket"
	o = append(o, 0xa6, 0x42, 0x75, 0x63, 0x6b, 0x65, 0x74)
	o = msgp.AppendString(o, z.Bucket)
	// string "Prefix"
	o = append(o, 0xa6, 0x50, 0x72, 0x65, 0x66, 0x69, 0x78)
	o, err = z.Prefix.MarshalMsg(o)

        StringBuilder sb = new StringBuilder();
        sb.append("SmbOperationException{");
        sb.append("errorCode=").append(errorCode);
        sb.append(", category=").append(errorCode.getCategory());
        sb.append(", retryable=").append(isRetryable());
        sb.append(", attempt=").append(attemptNumber);
        sb.append(", operation='").append(operationName).append('\'');

        if (ntStatus != 0) {

        buf.append("-Xlog:gc*,gc+age=trace,safepoint:file=");
        if (logFilePath != null) {
            buf.append(logFilePath);
        } else {
            buf.append(ComponentUtil.getSystemHelper().getLogFilePath());
        }
        buf.append(File.separator);
        buf.append("gc-").append(getExecuteType()).append(".log");
        buf.append(":utctime,pid,tags:filecount=5,filesize=64m");

        StringBuilder sb = new StringBuilder(256);
        sb.append("[scope=").append(scope.getScope());
        if (classpath != null) {
            for (ArtifactMetadata md : classpath) {
                sb.append(": ")
                        .append(md.toString())
                        .append('{')
                        .append(md.getArtifactUri())
                        .append('}');
            }
        }