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/*
 * ============LICENSE_START=======================================================
 * dcaegen2-collectors-veshv
 * ================================================================================
 * Copyright (C) 2018 NOKIA
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */
package org.onap.dcae.collectors.veshv.impl

import arrow.core.Option
import com.google.protobuf.ByteString
import org.jetbrains.spek.api.Spek
import org.jetbrains.spek.api.dsl.given
import org.jetbrains.spek.api.dsl.it
import org.jetbrains.spek.api.dsl.on
import org.onap.dcae.collectors.veshv.domain.ByteData
import org.onap.dcae.collectors.veshv.model.VesMessage
import org.onap.dcae.collectors.veshv.tests.utils.commonHeader
import org.onap.dcae.collectors.veshv.tests.utils.vesEventBytes
import org.onap.ves.VesEventV5.VesEvent.CommonEventHeader.Domain
import java.nio.charset.Charset
import kotlin.test.assertTrue
import kotlin.test.fail


internal object VesDecoderTest : Spek({

    given("ves message decoder") {
        val cut = VesDecoder()

        on("ves hv message bytes") {
            val commonHeader = commonHeader(Domain.HEARTBEAT)
            val rawMessageBytes = vesEventBytes(commonHeader, ByteString.copyFromUtf8("highvolume measurements"))

            it("should decode only header and pass it on along with raw message") {
                val expectedMessage = VesMessage(
                        commonHeader,
                        rawMessageBytes
                )

                assertTrue {
                    cut.decode(rawMessageBytes).exists {
                        it == expectedMessage
                    }
                }
            }
        }

        on("invalid ves hv message bytes") {
            val rawMessageBytes = ByteData("ala ma kota".toByteArray(Charset.defaultCharset()))

            it("should throw error") {
                assertFailedWithError(cut.decode(rawMessageBytes))
            }
        }
    }
})

private fun <A> assertFailedWithError(option: Option<A>) =
        option.exists {
            fail("Error expected")
        }