{"id":550,"date":"2025-07-29T10:23:00","date_gmt":"2025-07-29T08:23:00","guid":{"rendered":"https:\/\/itsonix.laolaweb.com\/?p=550"},"modified":"2026-05-13T10:32:28","modified_gmt":"2026-05-13T08:32:28","slug":"contract-testing-the-challenge-of-modern-interfaces","status":"publish","type":"post","link":"https:\/\/itsonix.eu\/en\/blog\/contract-testing-die-herausforderung-moderner-schnittstellen\/","title":{"rendered":"Contract Testing \u2013 The Challenge of Modern Interfaces"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">In der heutigen dynamischen Softwareentwicklung sind Microservices, APIs und modulare Architekturen allgegenw\u00e4rtig. Sie bilden das Fundament flexibler, skalierbarer und wartbarer Systeme. Diese Technologien erm\u00f6glichen es Teams, schnell auf Marktanforderungen zu reagieren und innovative L\u00f6sungen zu entwickeln. Gleichzeitig entstehen neue Herausforderungen, insbesondere wenn mehrere Services miteinander kommunizieren m\u00fcssen. Mit jeder zus\u00e4tzlichen Schnittstelle steigt die Komplexit\u00e4t der Integration. Das kann zu schwer auffindbaren Bugs, Systemausf\u00e4llen oder sogar Sicherheitsl\u00fccken f\u00fchren.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Um moderne Systeme zuverl\u00e4ssig und in der gewohnten IT Sonix Qualit\u00e4t kontinuierlich ausliefern zu k\u00f6nnen, setzen wir u. a. auf Contract Testing. Diese Methode bietet eine bew\u00e4hrte und praxisnahe Antwort auf die wachsenden Integrationsrisiken und st\u00e4rkt die Stabilit\u00e4t unserer Softwarel\u00f6sungen.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Was ist Contract Testing?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Contract Testing ist ein automatisiertes und pr\u00e4zises Testverfahren, das die Kommunikation zwischen zwei Systemen \u2013 typischerweise einem Consumer und einem Provider \u2013 anhand eines klar definierten und gemeinsam vereinbarten Vertrags \u00fcberpr\u00fcft. Dieser Vertrag (Contract) legt detailliert fest, welche Datenformate, Nachrichtenstrukturen und Verhaltensweisen zwischen den Systemen ausgetauscht werden d\u00fcrfen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Im Gegensatz zu klassischen Integrationstests, die oft das gesamte System oder gro\u00dfe Teile davon pr\u00fcfen, konzentriert sich Contract Testing gezielt auf die Erwartungen und Vereinbarungen einzelner Schnittstellenpartner. Dadurch werden Fehler fr\u00fchzeitig erkannt und k\u00f6nnen behoben werden, bevor sie in der Produktion zu Problemen f\u00fchren.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Warum ist Contract Testing sinnvoll?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Fr\u00fcherkennung von Integrationsproblemen:<\/strong> Fehlerhafte oder nicht konforme Schnittstellen werden bereits in der Entwicklungsphase entdeckt, was teure Fehler in der Produktion verhindert.<\/li>\n\n\n\n<li><strong>Schnelle R\u00fcckmeldung:<\/strong> Contract Tests sind wesentlich schneller als klassische End-to-End-Tests und liefern unmittelbar Feedback bei \u00c4nderungen an der API.<\/li>\n\n\n\n<li><strong>Unabh\u00e4ngigkeit der Teams:<\/strong> Teams k\u00f6nnen ihre Services eigenst\u00e4ndig weiterentwickeln, ohne aufeinander warten zu m\u00fcssen, was die Agilit\u00e4t und Effizienz erh\u00f6ht.<\/li>\n\n\n\n<li><strong>Nahtlose Automatisierung:<\/strong> Die Tests lassen sich problemlos in bestehende CI\/CD-Pipelines integrieren, was Continuous Delivery und Continuous Integration unterst\u00fctzt.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Wie funktioniert Contract Testing?<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Vertragserstellung<\/strong><br>Der erste Schritt besteht in der pr\u00e4zisen Definition des Vertrags. Dabei wird festgelegt, welche Requests ein Consumer an den Provider senden darf und welche Responses dieser zur\u00fcckliefern muss. Tools wie Pact oder Spring Cloud Contract erleichtern die Erstellung und Verwaltung dieser Vertr\u00e4ge.<\/li>\n\n\n\n<li><strong>Testdurchf\u00fchrung<\/strong><br>Die Tests werden sowohl auf Consumer- als auch auf Provider-Seite ausgef\u00fchrt:\n<ul class=\"wp-block-list\">\n<li><em>Consumer-Tests<\/em>: \u00dcberpr\u00fcfen, ob der Provider die Erwartungen des Consumers erf\u00fcllt.<\/li>\n\n\n\n<li><em>Provider-Tests<\/em>: Validieren, ob die Implementierung des Providers mit dem Vertrag \u00fcbereinstimmt.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Integration in die CI\/CD-Pipeline<\/strong><br>Contract Tests werden automatisiert in die Build- und Deployment-Pipeline eingebunden. So erhalten Teams sofortiges Feedback bei Schnittstellen\u00e4nderungen und k\u00f6nnen fr\u00fchzeitig reagieren.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Consumer-driven vs. Provider-driven Contract Testing<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Es existieren zwei etablierte Ans\u00e4tze:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Consumer-driven<\/strong>: Der Consumer definiert den Vertrag. Dies ist besonders sinnvoll, wenn sich die Anforderungen auf der Consumer-Seite h\u00e4ufig \u00e4ndern oder viele unterschiedliche Consumer existieren.<\/li>\n\n\n\n<li><strong>Provider-driven<\/strong>: Der Provider legt die Vertragsbedingungen fest. Dieser Ansatz eignet sich, wenn der Provider oft angepasst wird oder mehrere Consumer bedient, die f\u00fcr eine Zusammenarbeit nicht leicht zug\u00e4nglich sind.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Typische Tools und Technologien<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Pact<\/strong>: Ein weit verbreitetes Open-Source-Tool, das verschiedene Programmiersprachen unterst\u00fctzt.<\/li>\n\n\n\n<li><strong>Spring Cloud Contract<\/strong>: Besonders beliebt im Java- und Spring-\u00d6kosystem.<\/li>\n\n\n\n<li><strong>Hoverfly<\/strong>: Speziell f\u00fcr HTTP\/S-APIs und Service-Virtualisierung konzipiert.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Ein Beispiel mit Pact<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In diesem Beispiel wird anhand der PetStore-API und mit PACT dargestellt, wie Contract Testing in der Praxis aussieht.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Consumer definiert den Vertrag<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Zun\u00e4chst braucht es eine neue Abh\u00e4ngigkeit (Maven)<\/p>\n\n\n<div\n    class=\"align wp-block-bch-code-highlight\"    id=\"bhcCodeHighlight-1\"\n    data-attributes='{&quot;cId&quot;:&quot;4e1535fc-6&quot;,&quot;lineNumbers&quot;:false,&quot;align&quot;:&quot;&quot;,&quot;language&quot;:&quot;javascript&quot;,&quot;copyBtnOption&quot;:&quot;Text&quot;,&quot;theme&quot;:&quot;default&quot;,&quot;headerPart&quot;:false,&quot;headingTitleTypo&quot;:{&quot;fontWeight&quot;:400,&quot;fontSize&quot;:{&quot;desktop&quot;:18,&quot;tablet&quot;:13,&quot;mobile&quot;:11},&quot;lineHeight&quot;:1.5,&quot;fontFamily&quot;:&quot;Aleo&quot;,&quot;textTransform&quot;:&quot;uppercase&quot;},&quot;codeTypo&quot;:{&quot;desktop&quot;:18,&quot;tablet&quot;:15,&quot;mobile&quot;:14},&quot;clipBoard&quot;:true,&quot;wordWrap&quot;:true,&quot;width&quot;:{&quot;desktop&quot;:&quot;100%&quot;,&quot;tablet&quot;:&quot;100%&quot;,&quot;mobile&quot;:&quot;100%&quot;},&quot;height&quot;:{&quot;desktop&quot;:&quot;0px&quot;,&quot;tablet&quot;:&quot;0px&quot;,&quot;mobile&quot;:&quot;0px&quot;},&quot;padding&quot;:{&quot;top&quot;:&quot;0px&quot;,&quot;right&quot;:&quot;0px&quot;,&quot;bottom&quot;:&quot;0px&quot;,&quot;left&quot;:&quot;0px&quot;},&quot;background&quot;:{&quot;color&quot;:&quot;#d3cfcf42&quot;},&quot;headerBg&quot;:{&quot;color&quot;:&quot;#2f446e&quot;},&quot;headerTextColor&quot;:{&quot;color&quot;:&quot;#ffff&quot;},&quot;headerThemeOpt&quot;:&quot;one&quot;,&quot;layout&quot;:{&quot;align&quot;:&quot;left&quot;},&quot;border&quot;:{&quot;color&quot;:&quot;#000&quot;,&quot;style&quot;:&quot;solid&quot;,&quot;width&quot;:&quot;0px&quot;},&quot;shadow&quot;:[{&quot;hOffset&quot;:&quot;0px&quot;,&quot;vOffset&quot;:&quot;0px&quot;,&quot;blur&quot;:&quot;0px&quot;,&quot;spread&quot;:&quot;0px&quot;,&quot;color&quot;:&quot;rgba(0, 0, 0, 0.16)&quot;,&quot;isInset&quot;:false}],&quot;alignment&quot;:&quot;center&quot;,&quot;copyTypo&quot;:{&quot;fontWeight&quot;:400,&quot;fontSize&quot;:{&quot;desktop&quot;:13,&quot;tablet&quot;:13,&quot;mobile&quot;:11},&quot;lineHeight&quot;:1.5,&quot;fontFamily&quot;:&quot;Aleo&quot;},&quot;clipBoardColors&quot;:{&quot;color&quot;:&quot;#fff&quot;,&quot;bg&quot;:&quot;#00000024&quot;},&quot;copyIconSize&quot;:{&quot;desktop&quot;:24,&quot;tablet&quot;:20,&quot;mobile&quot;:18},&quot;copyBtnPadding&quot;:{&quot;desktop&quot;:{&quot;top&quot;:&quot;2px&quot;,&quot;left&quot;:&quot;5px&quot;,&quot;bottom&quot;:&quot;2px&quot;,&quot;right&quot;:&quot;5px&quot;},&quot;tablet&quot;:{&quot;top&quot;:&quot;2px&quot;,&quot;left&quot;:&quot;5px&quot;,&quot;bottom&quot;:&quot;2px&quot;,&quot;right&quot;:&quot;5px&quot;},&quot;mobile&quot;:{&quot;top&quot;:&quot;2px&quot;,&quot;left&quot;:&quot;5px&quot;,&quot;bottom&quot;:&quot;2px&quot;,&quot;right&quot;:&quot;5px&quot;}},&quot;headerPadding&quot;:{&quot;desktop&quot;:{&quot;top&quot;:&quot;14px&quot;,&quot;left&quot;:&quot;14px&quot;,&quot;bottom&quot;:&quot;14px&quot;,&quot;right&quot;:&quot;14px&quot;},&quot;tablet&quot;:{&quot;top&quot;:&quot;12px&quot;,&quot;left&quot;:&quot;12px&quot;,&quot;bottom&quot;:&quot;12px&quot;,&quot;right&quot;:&quot;12px&quot;},&quot;mobile&quot;:{&quot;top&quot;:&quot;10px&quot;,&quot;left&quot;:&quot;10px&quot;,&quot;bottom&quot;:&quot;10px&quot;,&quot;right&quot;:&quot;10px&quot;}},&quot;copyBtnPosition&quot;:{&quot;desktop&quot;:{&quot;top&quot;:&quot;5px&quot;,&quot;left&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;right&quot;:&quot;15px&quot;},&quot;tablet&quot;:{&quot;top&quot;:&quot;5px&quot;,&quot;left&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;right&quot;:&quot;15px&quot;},&quot;mobile&quot;:{&quot;top&quot;:&quot;5px&quot;,&quot;left&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;right&quot;:&quot;15px&quot;}},&quot;codeBg&quot;:{&quot;color&quot;:&quot;&quot;},&quot;outputOption&quot;:false,&quot;outputText&quot;:&quot;Hello Word !&quot;,&quot;outputColors&quot;:{&quot;color&quot;:&quot;#fff&quot;,&quot;bg&quot;:&quot;#2F446E&quot;},&quot;outputTypo&quot;:{&quot;fontWeight&quot;:400,&quot;fontSize&quot;:{&quot;desktop&quot;:21,&quot;tablet&quot;:17,&quot;mobile&quot;:13},&quot;lineHeight&quot;:1.5,&quot;fontFamily&quot;:&quot;Aleo&quot;},&quot;outputPadding&quot;:{&quot;desktop&quot;:{&quot;top&quot;:&quot;8px&quot;,&quot;left&quot;:&quot;8px&quot;,&quot;bottom&quot;:&quot;8px&quot;,&quot;right&quot;:&quot;8px&quot;},&quot;tablet&quot;:{&quot;top&quot;:&quot;7px&quot;,&quot;left&quot;:&quot;7px&quot;,&quot;bottom&quot;:&quot;7px&quot;,&quot;right&quot;:&quot;7px&quot;},&quot;mobile&quot;:{&quot;top&quot;:&quot;5px&quot;,&quot;left&quot;:&quot;5px&quot;,&quot;bottom&quot;:&quot;5px&quot;,&quot;right&quot;:&quot;5px&quot;}},&quot;outputBorder&quot;:{&quot;color&quot;:&quot;#000&quot;,&quot;style&quot;:&quot;solid&quot;,&quot;width&quot;:&quot;0px&quot;,&quot;radius&quot;:&quot;7px&quot;},&quot;TrpContentRestriction&quot;:{&quot;restriction_type&quot;:&quot;exclude&quot;,&quot;selected_languages&quot;:[],&quot;panel_open&quot;:true}}'\n>\n    <pre class=\"bchCodeData\" style=\"display:none;\">&quot;&lt;dependency&gt;\\n    &lt;groupId&gt;au.com.dius.pact.consumer&lt;\\\/groupId&gt;\\n    &lt;artifactId&gt;junit5&lt;\\\/artifactId&gt;\\n    &lt;version&gt;4.6.17&lt;\\\/version&gt;\\n    &lt;scope&gt;test&lt;\\\/scope&gt;\\n&lt;\\\/dependency&gt;&quot;<\/pre>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Consumer Pact Test:<\/p>\n\n\n<div\n    class=\"align wp-block-bch-code-highlight\"    id=\"bhcCodeHighlight-2\"\n    data-attributes='{&quot;cId&quot;:&quot;87ed8cdf-f&quot;,&quot;lineNumbers&quot;:false,&quot;align&quot;:&quot;&quot;,&quot;language&quot;:&quot;javascript&quot;,&quot;copyBtnOption&quot;:&quot;Text&quot;,&quot;theme&quot;:&quot;default&quot;,&quot;headerPart&quot;:false,&quot;headingTitleTypo&quot;:{&quot;fontWeight&quot;:400,&quot;fontSize&quot;:{&quot;desktop&quot;:18,&quot;tablet&quot;:13,&quot;mobile&quot;:11},&quot;lineHeight&quot;:1.5,&quot;fontFamily&quot;:&quot;Aleo&quot;,&quot;textTransform&quot;:&quot;uppercase&quot;},&quot;codeTypo&quot;:{&quot;desktop&quot;:18,&quot;tablet&quot;:15,&quot;mobile&quot;:14},&quot;clipBoard&quot;:true,&quot;wordWrap&quot;:true,&quot;width&quot;:{&quot;desktop&quot;:&quot;100%&quot;,&quot;tablet&quot;:&quot;100%&quot;,&quot;mobile&quot;:&quot;100%&quot;},&quot;height&quot;:{&quot;desktop&quot;:&quot;0px&quot;,&quot;tablet&quot;:&quot;0px&quot;,&quot;mobile&quot;:&quot;0px&quot;},&quot;padding&quot;:{&quot;top&quot;:&quot;0px&quot;,&quot;right&quot;:&quot;0px&quot;,&quot;bottom&quot;:&quot;0px&quot;,&quot;left&quot;:&quot;0px&quot;},&quot;background&quot;:{&quot;color&quot;:&quot;#d3cfcf42&quot;},&quot;headerBg&quot;:{&quot;color&quot;:&quot;#2f446e&quot;},&quot;headerTextColor&quot;:{&quot;color&quot;:&quot;#ffff&quot;},&quot;headerThemeOpt&quot;:&quot;one&quot;,&quot;layout&quot;:{&quot;align&quot;:&quot;left&quot;},&quot;border&quot;:{&quot;color&quot;:&quot;#000&quot;,&quot;style&quot;:&quot;solid&quot;,&quot;width&quot;:&quot;0px&quot;},&quot;shadow&quot;:[{&quot;hOffset&quot;:&quot;0px&quot;,&quot;vOffset&quot;:&quot;0px&quot;,&quot;blur&quot;:&quot;0px&quot;,&quot;spread&quot;:&quot;0px&quot;,&quot;color&quot;:&quot;rgba(0, 0, 0, 0.16)&quot;,&quot;isInset&quot;:false}],&quot;alignment&quot;:&quot;center&quot;,&quot;copyTypo&quot;:{&quot;fontWeight&quot;:400,&quot;fontSize&quot;:{&quot;desktop&quot;:13,&quot;tablet&quot;:13,&quot;mobile&quot;:11},&quot;lineHeight&quot;:1.5,&quot;fontFamily&quot;:&quot;Aleo&quot;},&quot;clipBoardColors&quot;:{&quot;color&quot;:&quot;#fff&quot;,&quot;bg&quot;:&quot;#00000024&quot;},&quot;copyIconSize&quot;:{&quot;desktop&quot;:24,&quot;tablet&quot;:20,&quot;mobile&quot;:18},&quot;copyBtnPadding&quot;:{&quot;desktop&quot;:{&quot;top&quot;:&quot;2px&quot;,&quot;left&quot;:&quot;5px&quot;,&quot;bottom&quot;:&quot;2px&quot;,&quot;right&quot;:&quot;5px&quot;},&quot;tablet&quot;:{&quot;top&quot;:&quot;2px&quot;,&quot;left&quot;:&quot;5px&quot;,&quot;bottom&quot;:&quot;2px&quot;,&quot;right&quot;:&quot;5px&quot;},&quot;mobile&quot;:{&quot;top&quot;:&quot;2px&quot;,&quot;left&quot;:&quot;5px&quot;,&quot;bottom&quot;:&quot;2px&quot;,&quot;right&quot;:&quot;5px&quot;}},&quot;headerPadding&quot;:{&quot;desktop&quot;:{&quot;top&quot;:&quot;14px&quot;,&quot;left&quot;:&quot;14px&quot;,&quot;bottom&quot;:&quot;14px&quot;,&quot;right&quot;:&quot;14px&quot;},&quot;tablet&quot;:{&quot;top&quot;:&quot;12px&quot;,&quot;left&quot;:&quot;12px&quot;,&quot;bottom&quot;:&quot;12px&quot;,&quot;right&quot;:&quot;12px&quot;},&quot;mobile&quot;:{&quot;top&quot;:&quot;10px&quot;,&quot;left&quot;:&quot;10px&quot;,&quot;bottom&quot;:&quot;10px&quot;,&quot;right&quot;:&quot;10px&quot;}},&quot;copyBtnPosition&quot;:{&quot;desktop&quot;:{&quot;top&quot;:&quot;5px&quot;,&quot;left&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;right&quot;:&quot;15px&quot;},&quot;tablet&quot;:{&quot;top&quot;:&quot;5px&quot;,&quot;left&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;right&quot;:&quot;15px&quot;},&quot;mobile&quot;:{&quot;top&quot;:&quot;5px&quot;,&quot;left&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;right&quot;:&quot;15px&quot;}},&quot;codeBg&quot;:{&quot;color&quot;:&quot;&quot;},&quot;outputOption&quot;:false,&quot;outputText&quot;:&quot;Hello Word !&quot;,&quot;outputColors&quot;:{&quot;color&quot;:&quot;#fff&quot;,&quot;bg&quot;:&quot;#2F446E&quot;},&quot;outputTypo&quot;:{&quot;fontWeight&quot;:400,&quot;fontSize&quot;:{&quot;desktop&quot;:21,&quot;tablet&quot;:17,&quot;mobile&quot;:13},&quot;lineHeight&quot;:1.5,&quot;fontFamily&quot;:&quot;Aleo&quot;},&quot;outputPadding&quot;:{&quot;desktop&quot;:{&quot;top&quot;:&quot;8px&quot;,&quot;left&quot;:&quot;8px&quot;,&quot;bottom&quot;:&quot;8px&quot;,&quot;right&quot;:&quot;8px&quot;},&quot;tablet&quot;:{&quot;top&quot;:&quot;7px&quot;,&quot;left&quot;:&quot;7px&quot;,&quot;bottom&quot;:&quot;7px&quot;,&quot;right&quot;:&quot;7px&quot;},&quot;mobile&quot;:{&quot;top&quot;:&quot;5px&quot;,&quot;left&quot;:&quot;5px&quot;,&quot;bottom&quot;:&quot;5px&quot;,&quot;right&quot;:&quot;5px&quot;}},&quot;outputBorder&quot;:{&quot;color&quot;:&quot;#000&quot;,&quot;style&quot;:&quot;solid&quot;,&quot;width&quot;:&quot;0px&quot;,&quot;radius&quot;:&quot;7px&quot;},&quot;TrpContentRestriction&quot;:{&quot;restriction_type&quot;:&quot;exclude&quot;,&quot;selected_languages&quot;:[],&quot;panel_open&quot;:true}}'\n>\n    <pre class=\"bchCodeData\" style=\"display:none;\">&quot;import static org.junit.jupiter.api.Assertions.assertEquals;\\n\\nimport au.com.dius.pact.consumer.MockServer;\\nimport au.com.dius.pact.consumer.dsl.PactBuilder;\\nimport au.com.dius.pact.consumer.junit5.PactConsumerTestExt;\\nimport au.com.dius.pact.consumer.junit5.PactTestFor;\\nimport au.com.dius.pact.core.model.V4Pact;\\nimport au.com.dius.pact.core.model.annotations.Pact;\\nimport java.io.IOException;\\nimport java.net.HttpURLConnection;\\nimport java.net.URL;\\nimport org.junit.jupiter.api.Test;\\nimport org.junit.jupiter.api.extension.ExtendWith;\\n\\n@PactTestFor(providerName = \\&quot;PetStore\\&quot;, port = \\&quot;8081\\&quot;)\\n@ExtendWith(PactConsumerTestExt.class)\\nclass ConsumerPactTest {\\n\\n  @Pact(consumer = \\&quot;MyConsumer\\&quot;)\\n  public V4Pact createPact(PactBuilder builder) {\\n    return builder\\n        .usingLegacyDsl()\\n        .given(\\&quot; a pet with id 1 exists\\&quot;)\\n        .uponReceiving(\\&quot;a request for pet with id 1\\&quot;)\\n            .path(\\&quot;\\\/api\\\/v3\\\/pet\\\/1\\&quot;)\\n            .method(\\&quot;GET\\&quot;)\\n        .willRespondWith()\\n            .status(200)\\n        .body(\\&quot;{\\\\n\\&quot;\\n            + \\&quot;  \\\\\\&quot;id\\\\\\&quot;: 1,\\\\n\\&quot;\\n            + \\&quot;  \\\\\\&quot;name\\\\\\&quot;: \\\\\\&quot;Cat 1\\\\\\&quot;,\\\\n\\&quot;\\n            + \\&quot;  \\\\\\&quot;status\\\\\\&quot;: \\\\\\&quot;available\\\\\\&quot;\\\\n\\&quot;\\n            + \\&quot;}\\&quot;)\\n        .toPact(V4Pact.class);\\n  }\\n\\n  @Test\\n  void testConsumerInteraction(MockServer mockServer) throws IOException {\\n    URL url = new URL(mockServer.getUrl() + \\&quot;\\\/api\\\/v3\\\/pet\\\/1\\&quot;);\\n    HttpURLConnection connection = (HttpURLConnection) url.openConnection();\\n    connection.setRequestMethod(\\&quot;GET\\&quot;);\\n\\n    assertEquals(200, connection.getResponseCode());\\n  }\\n}&quot;<\/pre>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Dieser Test erzeugt eine Pact-Datei, die als Vertrag f\u00fcr den Provider dient.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Provider verifiziert den Vertrag<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Auch hier braucht es eine neue Abh\u00e4ngigkeit (Maven)<\/p>\n\n\n<div\n    class=\"align wp-block-bch-code-highlight\"    id=\"bhcCodeHighlight-3\"\n    data-attributes='{&quot;cId&quot;:&quot;606a03cd-c&quot;,&quot;codeBg&quot;:{&quot;color&quot;:&quot;#F3F3F3&quot;},&quot;align&quot;:&quot;&quot;,&quot;language&quot;:&quot;javascript&quot;,&quot;lineNumbers&quot;:true,&quot;copyBtnOption&quot;:&quot;Text&quot;,&quot;theme&quot;:&quot;default&quot;,&quot;headerPart&quot;:false,&quot;headingTitleTypo&quot;:{&quot;fontWeight&quot;:400,&quot;fontSize&quot;:{&quot;desktop&quot;:18,&quot;tablet&quot;:13,&quot;mobile&quot;:11},&quot;lineHeight&quot;:1.5,&quot;fontFamily&quot;:&quot;Aleo&quot;,&quot;textTransform&quot;:&quot;uppercase&quot;},&quot;codeTypo&quot;:{&quot;desktop&quot;:18,&quot;tablet&quot;:15,&quot;mobile&quot;:14},&quot;clipBoard&quot;:true,&quot;wordWrap&quot;:true,&quot;width&quot;:{&quot;desktop&quot;:&quot;100%&quot;,&quot;tablet&quot;:&quot;100%&quot;,&quot;mobile&quot;:&quot;100%&quot;},&quot;height&quot;:{&quot;desktop&quot;:&quot;0px&quot;,&quot;tablet&quot;:&quot;0px&quot;,&quot;mobile&quot;:&quot;0px&quot;},&quot;padding&quot;:{&quot;top&quot;:&quot;0px&quot;,&quot;right&quot;:&quot;0px&quot;,&quot;bottom&quot;:&quot;0px&quot;,&quot;left&quot;:&quot;0px&quot;},&quot;background&quot;:{&quot;color&quot;:&quot;#d3cfcf42&quot;},&quot;headerBg&quot;:{&quot;color&quot;:&quot;#2f446e&quot;},&quot;headerTextColor&quot;:{&quot;color&quot;:&quot;#ffff&quot;},&quot;headerThemeOpt&quot;:&quot;one&quot;,&quot;layout&quot;:{&quot;align&quot;:&quot;left&quot;},&quot;border&quot;:{&quot;color&quot;:&quot;#000&quot;,&quot;style&quot;:&quot;solid&quot;,&quot;width&quot;:&quot;0px&quot;},&quot;shadow&quot;:[{&quot;hOffset&quot;:&quot;0px&quot;,&quot;vOffset&quot;:&quot;0px&quot;,&quot;blur&quot;:&quot;0px&quot;,&quot;spread&quot;:&quot;0px&quot;,&quot;color&quot;:&quot;rgba(0, 0, 0, 0.16)&quot;,&quot;isInset&quot;:false}],&quot;alignment&quot;:&quot;center&quot;,&quot;copyTypo&quot;:{&quot;fontWeight&quot;:400,&quot;fontSize&quot;:{&quot;desktop&quot;:13,&quot;tablet&quot;:13,&quot;mobile&quot;:11},&quot;lineHeight&quot;:1.5,&quot;fontFamily&quot;:&quot;Aleo&quot;},&quot;clipBoardColors&quot;:{&quot;color&quot;:&quot;#fff&quot;,&quot;bg&quot;:&quot;#00000024&quot;},&quot;copyIconSize&quot;:{&quot;desktop&quot;:24,&quot;tablet&quot;:20,&quot;mobile&quot;:18},&quot;copyBtnPadding&quot;:{&quot;desktop&quot;:{&quot;top&quot;:&quot;2px&quot;,&quot;left&quot;:&quot;5px&quot;,&quot;bottom&quot;:&quot;2px&quot;,&quot;right&quot;:&quot;5px&quot;},&quot;tablet&quot;:{&quot;top&quot;:&quot;2px&quot;,&quot;left&quot;:&quot;5px&quot;,&quot;bottom&quot;:&quot;2px&quot;,&quot;right&quot;:&quot;5px&quot;},&quot;mobile&quot;:{&quot;top&quot;:&quot;2px&quot;,&quot;left&quot;:&quot;5px&quot;,&quot;bottom&quot;:&quot;2px&quot;,&quot;right&quot;:&quot;5px&quot;}},&quot;headerPadding&quot;:{&quot;desktop&quot;:{&quot;top&quot;:&quot;14px&quot;,&quot;left&quot;:&quot;14px&quot;,&quot;bottom&quot;:&quot;14px&quot;,&quot;right&quot;:&quot;14px&quot;},&quot;tablet&quot;:{&quot;top&quot;:&quot;12px&quot;,&quot;left&quot;:&quot;12px&quot;,&quot;bottom&quot;:&quot;12px&quot;,&quot;right&quot;:&quot;12px&quot;},&quot;mobile&quot;:{&quot;top&quot;:&quot;10px&quot;,&quot;left&quot;:&quot;10px&quot;,&quot;bottom&quot;:&quot;10px&quot;,&quot;right&quot;:&quot;10px&quot;}},&quot;copyBtnPosition&quot;:{&quot;desktop&quot;:{&quot;top&quot;:&quot;5px&quot;,&quot;left&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;right&quot;:&quot;15px&quot;},&quot;tablet&quot;:{&quot;top&quot;:&quot;5px&quot;,&quot;left&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;right&quot;:&quot;15px&quot;},&quot;mobile&quot;:{&quot;top&quot;:&quot;5px&quot;,&quot;left&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;right&quot;:&quot;15px&quot;}},&quot;outputOption&quot;:false,&quot;outputText&quot;:&quot;Hello Word !&quot;,&quot;outputColors&quot;:{&quot;color&quot;:&quot;#fff&quot;,&quot;bg&quot;:&quot;#2F446E&quot;},&quot;outputTypo&quot;:{&quot;fontWeight&quot;:400,&quot;fontSize&quot;:{&quot;desktop&quot;:21,&quot;tablet&quot;:17,&quot;mobile&quot;:13},&quot;lineHeight&quot;:1.5,&quot;fontFamily&quot;:&quot;Aleo&quot;},&quot;outputPadding&quot;:{&quot;desktop&quot;:{&quot;top&quot;:&quot;8px&quot;,&quot;left&quot;:&quot;8px&quot;,&quot;bottom&quot;:&quot;8px&quot;,&quot;right&quot;:&quot;8px&quot;},&quot;tablet&quot;:{&quot;top&quot;:&quot;7px&quot;,&quot;left&quot;:&quot;7px&quot;,&quot;bottom&quot;:&quot;7px&quot;,&quot;right&quot;:&quot;7px&quot;},&quot;mobile&quot;:{&quot;top&quot;:&quot;5px&quot;,&quot;left&quot;:&quot;5px&quot;,&quot;bottom&quot;:&quot;5px&quot;,&quot;right&quot;:&quot;5px&quot;}},&quot;outputBorder&quot;:{&quot;color&quot;:&quot;#000&quot;,&quot;style&quot;:&quot;solid&quot;,&quot;width&quot;:&quot;0px&quot;,&quot;radius&quot;:&quot;7px&quot;},&quot;TrpContentRestriction&quot;:{&quot;restriction_type&quot;:&quot;exclude&quot;,&quot;selected_languages&quot;:[],&quot;panel_open&quot;:true}}'\n>\n    <pre class=\"bchCodeData\" style=\"display:none;\">&quot;&lt;dependency&gt;\\n    &lt;groupId&gt;au.com.dius.pact.provider&lt;\\\/groupId&gt;\\n    &lt;artifactId&gt;junit5&lt;\\\/artifactId&gt;\\n    &lt;version&gt;4.6.17&lt;\\\/version&gt;\\n    &lt;scope&gt;test&lt;\\\/scope&gt;\\n&lt;\\\/dependency&gt;&quot;<\/pre>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Provider Pact Test:<\/p>\n\n\n<div\n    class=\"align wp-block-bch-code-highlight\"    id=\"bhcCodeHighlight-4\"\n    data-attributes='{&quot;cId&quot;:&quot;4253d832-b&quot;,&quot;codeBg&quot;:{&quot;color&quot;:&quot;#F3F3F3&quot;},&quot;align&quot;:&quot;&quot;,&quot;language&quot;:&quot;javascript&quot;,&quot;lineNumbers&quot;:true,&quot;copyBtnOption&quot;:&quot;Text&quot;,&quot;theme&quot;:&quot;default&quot;,&quot;headerPart&quot;:false,&quot;headingTitleTypo&quot;:{&quot;fontWeight&quot;:400,&quot;fontSize&quot;:{&quot;desktop&quot;:18,&quot;tablet&quot;:13,&quot;mobile&quot;:11},&quot;lineHeight&quot;:1.5,&quot;fontFamily&quot;:&quot;Aleo&quot;,&quot;textTransform&quot;:&quot;uppercase&quot;},&quot;codeTypo&quot;:{&quot;desktop&quot;:18,&quot;tablet&quot;:15,&quot;mobile&quot;:14},&quot;clipBoard&quot;:true,&quot;wordWrap&quot;:true,&quot;width&quot;:{&quot;desktop&quot;:&quot;100%&quot;,&quot;tablet&quot;:&quot;100%&quot;,&quot;mobile&quot;:&quot;100%&quot;},&quot;height&quot;:{&quot;desktop&quot;:&quot;0px&quot;,&quot;tablet&quot;:&quot;0px&quot;,&quot;mobile&quot;:&quot;0px&quot;},&quot;padding&quot;:{&quot;top&quot;:&quot;0px&quot;,&quot;right&quot;:&quot;0px&quot;,&quot;bottom&quot;:&quot;0px&quot;,&quot;left&quot;:&quot;0px&quot;},&quot;background&quot;:{&quot;color&quot;:&quot;#d3cfcf42&quot;},&quot;headerBg&quot;:{&quot;color&quot;:&quot;#2f446e&quot;},&quot;headerTextColor&quot;:{&quot;color&quot;:&quot;#ffff&quot;},&quot;headerThemeOpt&quot;:&quot;one&quot;,&quot;layout&quot;:{&quot;align&quot;:&quot;left&quot;},&quot;border&quot;:{&quot;color&quot;:&quot;#000&quot;,&quot;style&quot;:&quot;solid&quot;,&quot;width&quot;:&quot;0px&quot;},&quot;shadow&quot;:[{&quot;hOffset&quot;:&quot;0px&quot;,&quot;vOffset&quot;:&quot;0px&quot;,&quot;blur&quot;:&quot;0px&quot;,&quot;spread&quot;:&quot;0px&quot;,&quot;color&quot;:&quot;rgba(0, 0, 0, 0.16)&quot;,&quot;isInset&quot;:false}],&quot;alignment&quot;:&quot;center&quot;,&quot;copyTypo&quot;:{&quot;fontWeight&quot;:400,&quot;fontSize&quot;:{&quot;desktop&quot;:13,&quot;tablet&quot;:13,&quot;mobile&quot;:11},&quot;lineHeight&quot;:1.5,&quot;fontFamily&quot;:&quot;Aleo&quot;},&quot;clipBoardColors&quot;:{&quot;color&quot;:&quot;#fff&quot;,&quot;bg&quot;:&quot;#00000024&quot;},&quot;copyIconSize&quot;:{&quot;desktop&quot;:24,&quot;tablet&quot;:20,&quot;mobile&quot;:18},&quot;copyBtnPadding&quot;:{&quot;desktop&quot;:{&quot;top&quot;:&quot;2px&quot;,&quot;left&quot;:&quot;5px&quot;,&quot;bottom&quot;:&quot;2px&quot;,&quot;right&quot;:&quot;5px&quot;},&quot;tablet&quot;:{&quot;top&quot;:&quot;2px&quot;,&quot;left&quot;:&quot;5px&quot;,&quot;bottom&quot;:&quot;2px&quot;,&quot;right&quot;:&quot;5px&quot;},&quot;mobile&quot;:{&quot;top&quot;:&quot;2px&quot;,&quot;left&quot;:&quot;5px&quot;,&quot;bottom&quot;:&quot;2px&quot;,&quot;right&quot;:&quot;5px&quot;}},&quot;headerPadding&quot;:{&quot;desktop&quot;:{&quot;top&quot;:&quot;14px&quot;,&quot;left&quot;:&quot;14px&quot;,&quot;bottom&quot;:&quot;14px&quot;,&quot;right&quot;:&quot;14px&quot;},&quot;tablet&quot;:{&quot;top&quot;:&quot;12px&quot;,&quot;left&quot;:&quot;12px&quot;,&quot;bottom&quot;:&quot;12px&quot;,&quot;right&quot;:&quot;12px&quot;},&quot;mobile&quot;:{&quot;top&quot;:&quot;10px&quot;,&quot;left&quot;:&quot;10px&quot;,&quot;bottom&quot;:&quot;10px&quot;,&quot;right&quot;:&quot;10px&quot;}},&quot;copyBtnPosition&quot;:{&quot;desktop&quot;:{&quot;top&quot;:&quot;5px&quot;,&quot;left&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;right&quot;:&quot;15px&quot;},&quot;tablet&quot;:{&quot;top&quot;:&quot;5px&quot;,&quot;left&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;right&quot;:&quot;15px&quot;},&quot;mobile&quot;:{&quot;top&quot;:&quot;5px&quot;,&quot;left&quot;:&quot;&quot;,&quot;bottom&quot;:&quot;&quot;,&quot;right&quot;:&quot;15px&quot;}},&quot;outputOption&quot;:false,&quot;outputText&quot;:&quot;Hello Word !&quot;,&quot;outputColors&quot;:{&quot;color&quot;:&quot;#fff&quot;,&quot;bg&quot;:&quot;#2F446E&quot;},&quot;outputTypo&quot;:{&quot;fontWeight&quot;:400,&quot;fontSize&quot;:{&quot;desktop&quot;:21,&quot;tablet&quot;:17,&quot;mobile&quot;:13},&quot;lineHeight&quot;:1.5,&quot;fontFamily&quot;:&quot;Aleo&quot;},&quot;outputPadding&quot;:{&quot;desktop&quot;:{&quot;top&quot;:&quot;8px&quot;,&quot;left&quot;:&quot;8px&quot;,&quot;bottom&quot;:&quot;8px&quot;,&quot;right&quot;:&quot;8px&quot;},&quot;tablet&quot;:{&quot;top&quot;:&quot;7px&quot;,&quot;left&quot;:&quot;7px&quot;,&quot;bottom&quot;:&quot;7px&quot;,&quot;right&quot;:&quot;7px&quot;},&quot;mobile&quot;:{&quot;top&quot;:&quot;5px&quot;,&quot;left&quot;:&quot;5px&quot;,&quot;bottom&quot;:&quot;5px&quot;,&quot;right&quot;:&quot;5px&quot;}},&quot;outputBorder&quot;:{&quot;color&quot;:&quot;#000&quot;,&quot;style&quot;:&quot;solid&quot;,&quot;width&quot;:&quot;0px&quot;,&quot;radius&quot;:&quot;7px&quot;},&quot;TrpContentRestriction&quot;:{&quot;restriction_type&quot;:&quot;exclude&quot;,&quot;selected_languages&quot;:[],&quot;panel_open&quot;:true}}'\n>\n    <pre class=\"bchCodeData\" style=\"display:none;\">&quot;import au.com.dius.pact.provider.junit5.PactVerificationContext;\\nimport au.com.dius.pact.provider.junit5.PactVerificationInvocationContextProvider;\\nimport au.com.dius.pact.provider.junit5.PactVerification;\\nimport au.com.dius.pact.provider.junitsupport.Provider;\\nimport org.junit.jupiter.api.BeforeEach;\\nimport org.junit.jupiter.api.TestTemplate;\\nimport org.junit.jupiter.api.extension.ExtendWith;\\n\\n@Provider(\\&quot;PetStore\\&quot;)\\nclass ProviderPactTest {\\n\\n    @BeforeEach\\n    void before(PactVerificationContext context) {\\n        context.setTarget(new HttpTestTarget(\\&quot;localhost\\&quot;, 8080));\\n    }\\n\\n    @TestTemplate\\n    @ExtendWith(PactVerificationInvocationContextProvider.class)\\n    @PactVerification\\n    void pactVerificationTestTemplate(PactVerificationContext context) {\\n        context.verifyInteraction();\\n    }\\n}&quot;<\/pre>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Der Austausch des Vertrags und die (hoffentlich) erfolgreiche Verifikation des Vertrags durch den Provider werden durch den Pact Broker verwaltet.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Herausforderungen und Implementierungsaspekte<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Die Einf\u00fchrung von Contract Testing bringt spezifische Herausforderungen mit sich, die sorgf\u00e4ltige Planung erfordern. Eine zentrale Herausforderung liegt in der korrekten Definition der Vertr\u00e4ge: Sie m\u00fcssen spezifisch genug sein, um echte Inkompatibilit\u00e4ten zu erkennen, aber flexibel genug, um unwichtige \u00c4nderungen zu tolerieren. Zu restriktive Vertr\u00e4ge k\u00f6nnen zu falschen Alarmen f\u00fchren, w\u00e4hrend zu permissive Vertr\u00e4ge wichtige Breaking Changes \u00fcbersehen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Die organisatorische Dimension stellt eine weitere Herausforderung dar. Contract Testing erfordert enge Zusammenarbeit zwischen Consumer- und Provider-Teams, da Vertrags\u00e4nderungen koordiniert werden m\u00fcssen. Das kann besonders in gro\u00dfen Organisationen mit vielen autonomen Teams komplex werden. Die Einrichtung und Wartung der Contract-Testing-Infrastruktur, einschlie\u00dflich Broker-Services und CI\/CD-Integration, erfordert zus\u00e4tzliche technische Expertise.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ein h\u00e4ufiger Fallstrick liegt in der Behandlung von Contract-Test-Fehlern. Anders als normale Unit-Test-Fehler sollten Contract-Test-Fehler nicht automatisch den Build abbrechen, sondern vielmehr einen Kommunikationsprozess zwischen den beteiligten Teams ansto\u00dfen.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Unsere Referenzen<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Contract Testing mit Pact kommt bereits in mehreren unserer Projekte erfolgreich zum Einsatz \u2013 insbesondere im Umfeld verteilter Energiesysteme. In einem aktuellen Projekt wurde Pact in die bestehende CI\/CD-Pipeline integriert, um Schnittstellen zwischen mehreren Microservices automatisiert abzusichern.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Auch in fr\u00fcheren Projekten haben wir Pact als Tool zur Qualit\u00e4tssicherung serviceorientierter Architekturen eingesetzt. Dabei standen vor allem Use Cases im Fokus, bei denen eine enge Abstimmung zwischen Consumer- und Provider-Systemen essenziell war, da der Provider eine zentrale Komponente mit vielen Abh\u00e4ngigkeiten darstellte.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Um unsere Expertise im Bereich Contract Testing weiter auszubauen, befasst sich derzeit unser Circle Qualit\u00e4tssicherung intensiv mit dem Thema. Der Fokus liegt dabei auf Best Practices f\u00fcr Pact im Enterprise-Umfeld.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Fazit<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Contract Testing ist zwar kein Allheilmittel, doch es hat sich als unverzichtbarer Baustein f\u00fcr den Aufbau robuster und skalierbarer Softwarelandschaften etabliert. Gerade in modernen, verteilten Architekturen, in denen zahlreiche Microservices und APIs miteinander interagieren, sorgt Contract Testing f\u00fcr ein hohes Ma\u00df an Zuverl\u00e4ssigkeit und Transparenz. Es schlie\u00dft die L\u00fccke zwischen klassischen Unit- und Integrationstests, indem es gezielt die Kommunikation und die gegenseitigen Erwartungen einzelner Services absichert.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Durch die fr\u00fchzeitige Erkennung von Integrationsproblemen, die unmittelbare R\u00fcckmeldung bei \u00c4nderungen und die nahtlose Einbindung in CI\/CD-Pipelines wird Contract Testing zu einem echten Enabler f\u00fcr Continuous Delivery und agile Entwicklung. Teams k\u00f6nnen eigenst\u00e4ndig und dennoch abgestimmt arbeiten, was Innovation und Geschwindigkeit f\u00f6rdert, ohne Kompromisse bei der Qualit\u00e4t einzugehen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Wer heute auf nachhaltige Softwarequalit\u00e4t, schnelle Release-Zyklen und zufriedene User setzt, kommt an Contract Testing kaum vorbei. Es ist ein Werkzeug, das nicht nur technische Sicherheit schafft, sondern auch die Zusammenarbeit und das Vertrauen zwischen Entwicklungsteams st\u00e4rkt.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In der heutigen dynamischen Softwareentwicklung sind Microservices, APIs und modulare Architekturen allgegenw\u00e4rtig. Sie bilden das Fundament flexibler, skalierbarer und wartbarer Systeme. Diese Technologien erm\u00f6glichen es Teams, schnell auf Marktanforderungen zu reagieren und innovative L\u00f6sungen zu entwickeln. Gleichzeitig entstehen neue Herausforderungen, insbesondere wenn mehrere Services miteinander kommunizieren m\u00fcssen. Mit jeder zus\u00e4tzlichen Schnittstelle steigt die Komplexit\u00e4t der [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":557,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[5],"tags":[],"class_list":["post-550","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-softwareentwicklung"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Contract Testing \u2013 Die Herausforderung moderner Schnittstellen - IT Sonix - Ihr Partner f\u00fcr individuelle Softwarel\u00f6sungen<\/title>\n<meta name=\"description\" content=\"it Sonix Blog: Contract Testing \u2013 Die Herausforderung moderner Schnittstellen\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/itsonix.eu\/en\/blog\/contract-testing-the-challenge-of-modern-interfaces\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Contract Testing \u2013 Die Herausforderung moderner Schnittstellen - 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