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diff --git a/merchant-lib/src/test/java/net/taler/merchantlib/MockHttpClient.kt b/merchant-lib/src/test/java/net/taler/merchantlib/MockHttpClient.kt
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+++ b/merchant-lib/src/test/java/net/taler/merchantlib/MockHttpClient.kt
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+/*
+ * This file is part of GNU Taler
+ * (C) 2020 Taler Systems S.A.
+ *
+ * GNU Taler is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 3, or (at your option) any later version.
+ *
+ * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.merchantlib
+
+import io.ktor.client.HttpClient
+import io.ktor.client.engine.mock.MockEngine
+import io.ktor.client.engine.mock.MockEngineConfig
+import io.ktor.client.engine.mock.respond
+import io.ktor.client.features.json.JsonFeature
+import io.ktor.client.features.json.serializer.KotlinxSerializer
+import io.ktor.http.ContentType.Application.Json
+import io.ktor.http.Url
+import io.ktor.http.fullPath
+import io.ktor.http.headersOf
+import io.ktor.http.hostWithPort
+
+object MockHttpClient {
+
+ val httpClient = HttpClient(MockEngine) {
+ install(JsonFeature) {
+ serializer = KotlinxSerializer()
+ }
+ engine {
+ addHandler { error("No response handler set") }
+ }
+ }
+
+ fun HttpClient.giveJsonResponse(url: String, jsonProducer: () -> String) {
+ val httpConfig = engineConfig as MockEngineConfig
+ httpConfig.requestHandlers.removeAt(0)
+ httpConfig.requestHandlers.add { request ->
+ if (request.url.fullUrl == url) {
+ val headers = headersOf("Content-Type" to listOf(Json.toString()))
+ respond(jsonProducer(), headers = headers)
+ } else {
+ error("Unexpected URL: ${request.url.fullUrl}")
+ }
+ }
+ }
+
+ private val Url.hostWithPortIfRequired: String get() = if (port == protocol.defaultPort) host else hostWithPort
+ private val Url.fullUrl: String get() = "${protocol.name}://$hostWithPortIfRequired$fullPath"
+
+}