diff --git a/acme4j-client/src/main/java/org/shredzone/acme4j/Session.java b/acme4j-client/src/main/java/org/shredzone/acme4j/Session.java
index dc244a6e..cf67d34a 100644
--- a/acme4j-client/src/main/java/org/shredzone/acme4j/Session.java
+++ b/acme4j-client/src/main/java/org/shredzone/acme4j/Session.java
@@ -99,6 +99,26 @@ public class Session {
             .orElseThrow(() -> new IllegalArgumentException("No ACME provider found for " + localServerUri));
     }
 
+    /**
+     * Creates a new {@link Session} using the given {@link AcmeProvider}.
+     * <p>
+     * This constructor should only be used for testing purposes.
+     *
+     * @param serverUri
+     *         {@link URI} of the ACME server
+     * @param provider
+     *         {@link AcmeProvider} to be used
+     * @since 2.8
+     */
+    public Session(URI serverUri, AcmeProvider provider) {
+        this.serverUri = Objects.requireNonNull(serverUri, "serverUri");
+        this.provider = Objects.requireNonNull(provider, "provider");
+
+        if (!provider.accepts(serverUri)) {
+            throw new IllegalArgumentException("Provider does not accept " + serverUri);
+        }
+    }
+
     /**
      * Logs into an existing account.
      *
diff --git a/acme4j-client/src/test/java/org/shredzone/acme4j/SessionTest.java b/acme4j-client/src/test/java/org/shredzone/acme4j/SessionTest.java
index 38aa539e..346680e6 100644
--- a/acme4j-client/src/test/java/org/shredzone/acme4j/SessionTest.java
+++ b/acme4j-client/src/test/java/org/shredzone/acme4j/SessionTest.java
@@ -34,6 +34,7 @@ import org.mockito.ArgumentMatchers;
 import org.shredzone.acme4j.connector.Resource;
 import org.shredzone.acme4j.exception.AcmeException;
 import org.shredzone.acme4j.provider.AcmeProvider;
+import org.shredzone.acme4j.provider.GenericAcmeProvider;
 import org.shredzone.acme4j.toolbox.TestUtils;
 
 /**
@@ -63,12 +64,23 @@ public class SessionTest {
         assertThat(session2, not(nullValue()));
         assertThat(session2.getServerUri(), is(serverUri));
 
+        Session session3 = new Session(serverUri, new GenericAcmeProvider());
+        assertThat(session3, not(nullValue()));
+        assertThat(session3.getServerUri(), is(serverUri));
+
         try {
             new Session("#*aBaDuRi*#");
             fail("accepted bad URI in constructor");
         } catch (IllegalArgumentException ex) {
             // expected
         }
+
+        try {
+            new Session(URI.create("acme://invalid"), new GenericAcmeProvider());
+            fail("Provider accepted unsupported URI");
+        } catch (IllegalArgumentException ex) {
+            // expected
+        }
     }
 
     /**
@@ -189,7 +201,7 @@ public class SessionTest {
 
     /**
      * Asserts that the {@link Session} returns correct
-     * {@link Session#resourceUri(Resource)} and {@link Session#getMetadata()}.
+     * {@link Session#resourceUrl(Resource)} and {@link Session#getMetadata()}.
      *
      * @param session
      *            {@link Session} to assert