Add integration tests for the CA providers

These tests will fail if the directory URLs are changed, or if a
relevant part of the directory changes. If one of the tests should fail,
acme4j will need to be updated to the new directory URL or structure.

acme4j-it/src/test/java/org/shredzone/acme4j/it/ProviderIT.java

@@ -0,0 +1,101 @@
+/*
+ * acme4j - Java ACME client
+ *
+ * Copyright (C) 2024 Richard "Shred" Körber
+ *   http://acme4j.shredzone.org
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ *
+ * This program 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.
+ */
+package org.shredzone.acme4j.it;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatNoException;
+
+import java.net.MalformedURLException;
+import java.net.URL;
+
+import org.junit.jupiter.api.Test;
+import org.shredzone.acme4j.Session;
+import org.shredzone.acme4j.connector.Resource;
+import org.shredzone.acme4j.exception.AcmeException;
+
+/**
+ * A very simple test to check if all provider URIs are still pointing to a directory
+ * resource.
+ * <p>
+ * If one of these tests fails, it could be an indicator that the corresponding directory
+ * URL has been changed on CA side, or that EAR or auto-renewal features have been
+ * changed.
+ * <p>
+ * These integration tests require a network connection.
+ */
+public class ProviderIT {
+
+    /**
+     * Test Let's Encrypt
+     */
+    @Test
+    public void testLetsEncrypt() throws AcmeException, MalformedURLException {
+        var session = new Session("acme://letsencrypt.org");
+        assertThat(session.getMetadata().getWebsite()).hasValue(new URL("https://letsencrypt.org"));
+        assertThatNoException().isThrownBy(() -> session.resourceUrl(Resource.NEW_ACCOUNT));
+        assertThat(session.getMetadata().isExternalAccountRequired()).isFalse();
+        assertThat(session.getMetadata().isAutoRenewalEnabled()).isFalse();
+
+        var sessionStage = new Session("acme://letsencrypt.org/staging");
+        assertThat(sessionStage.getMetadata().getWebsite()).hasValue(new URL("https://letsencrypt.org/docs/staging-environment/"));
+        assertThatNoException().isThrownBy(() -> sessionStage.resourceUrl(Resource.NEW_ACCOUNT));
+        assertThat(sessionStage.getMetadata().isExternalAccountRequired()).isFalse();
+        assertThat(sessionStage.getMetadata().isAutoRenewalEnabled()).isFalse();
+    }
+
+    /**
+     * Test Pebble
+     */
+    @Test
+    public void testPebble() throws AcmeException, MalformedURLException {
+        var session = new Session("acme://pebble");
+        assertThat(session.getMetadata().getWebsite()).isEmpty();
+        assertThatNoException().isThrownBy(() -> session.resourceUrl(Resource.NEW_ACCOUNT));
+        assertThat(session.getMetadata().isExternalAccountRequired()).isFalse();
+        assertThat(session.getMetadata().isAutoRenewalEnabled()).isFalse();
+    }
+
+    /**
+     * Test ssl.com
+     */
+    @Test
+    public void testSslCom() throws AcmeException, MalformedURLException {
+        var session = new Session("acme://ssl.com");
+        assertThat(session.getMetadata().getWebsite()).hasValue(new URL("https://www.ssl.com"));
+        assertThatNoException().isThrownBy(() -> session.resourceUrl(Resource.NEW_ACCOUNT));
+        assertThat(session.getMetadata().isExternalAccountRequired()).isFalse();
+        assertThat(session.getMetadata().isAutoRenewalEnabled()).isFalse();
+
+        var sessionStage = new Session("acme://ssl.com/staging");
+        assertThat(sessionStage.getMetadata().getWebsite()).hasValue(new URL("https://www.ssl.com"));
+        assertThatNoException().isThrownBy(() -> sessionStage.resourceUrl(Resource.NEW_ACCOUNT));
+        assertThat(sessionStage.getMetadata().isExternalAccountRequired()).isFalse();
+        assertThat(sessionStage.getMetadata().isAutoRenewalEnabled()).isFalse();
+    }
+
+    /**
+     * Test ZeroSSL
+     */
+    @Test
+    public void testZeroSsl() throws AcmeException, MalformedURLException {
+        var session = new Session("acme://zerossl.com");
+        assertThat(session.getMetadata().getWebsite()).hasValue(new URL("https://zerossl.com"));
+        assertThatNoException().isThrownBy(() -> session.resourceUrl(Resource.NEW_ACCOUNT));
+        assertThat(session.getMetadata().isExternalAccountRequired()).isTrue();
+        assertThat(session.getMetadata().isAutoRenewalEnabled()).isFalse();
+
+        // ZeroSSL has no documented staging server (as of February 2024)
+    }
+
+}