diff --git a/atlassian-runtime-bridge-common/src/test/java/com/github/vzakharchenko/runtime/bridge/common/ProductAdaptersContractTest.java b/atlassian-runtime-bridge-common/src/test/java/com/github/vzakharchenko/runtime/bridge/common/ProductAdaptersContractTest.java
index b7bb4fe..d5bf474 100644
--- a/atlassian-runtime-bridge-common/src/test/java/com/github/vzakharchenko/runtime/bridge/common/ProductAdaptersContractTest.java
+++ b/atlassian-runtime-bridge-common/src/test/java/com/github/vzakharchenko/runtime/bridge/common/ProductAdaptersContractTest.java
@@ -4,17 +4,32 @@
 
 import com.atlassian.connect.spring.AtlassianHost;
 import com.atlassian.connect.spring.AtlassianHostUser;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Nested;
-import org.junit.jupiter.api.Test;
+import java.util.stream.Stream;
+import org.junit.jupiter.api.Named;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
 import org.springframework.web.client.RestTemplate;
 
 /**
  * Contract tests for product adapter interfaces: each exposes addon, current-user, and
- * impersonation {@link RestTemplate} entry points with the expected arguments.
+ * impersonation {@link RestTemplate} entry points with the expected arguments. The same five
+ * assertions run against Jira, Confluence, and Other stubs via {@link ParameterizedTest}.
  */
 class ProductAdaptersContractTest {
 
+  private static final String ADAPTERS_SOURCE = "adapters";
+  private static final String DISPLAY_NAME = "{0}";
+
+  @SuppressWarnings("UnusedMethod") // referenced by @MethodSource(ADAPTERS_SOURCE) via reflection
+  private static Stream<Arguments> adapters() {
+    return Stream.of(
+        Arguments.of(Named.<StubProductAdapterBase>of("Jira", new StubJiraProductAdapter())),
+        Arguments.of(
+            Named.<StubProductAdapterBase>of("Confluence", new StubConfluenceProductAdapter())),
+        Arguments.of(Named.<StubProductAdapterBase>of("Other", new StubOtherProductAdapter())));
+  }
+
   private static AtlassianHost sampleHost() {
     AtlassianHost host = new AtlassianHost();
     host.setInstallationId("inst-1");
@@ -26,178 +41,68 @@ private static AtlassianHostUser sampleUser(AtlassianHost host) {
     return AtlassianHostUser.builder(host).withUserAccountId("ari:cloud:identity::user/1").build();
   }
 
-  @Nested
-  class JiraProductAdapterContract {
-
-    private StubJiraProductAdapter adapter;
-
-    @BeforeEach
-    void createAdapter() {
-      adapter = new StubJiraProductAdapter();
-    }
-
-    @Test
-    void authenticatedAsAddonReturnsConfiguredTemplate() {
-      AtlassianHost host = sampleHost();
-      RestTemplate expected = new RestTemplate();
-      adapter.configureAddon(expected);
-
-      assertThat(adapter.authenticatedAsAddon(host)).isSameAs(expected);
-    }
-
-    @Test
-    void authenticatedAsAddonReceivesHost() {
-      AtlassianHost host = sampleHost();
-      adapter.authenticatedAsAddon(host);
-
-      assertThat(adapter.lastAddonHost).isSameAs(host);
-    }
-
-    @Test
-    void authenticatedAsCurrentUserReturnsConfiguredTemplate() {
-      RestTemplate expected = new RestTemplate();
-      adapter.configureCurrentUser(expected);
-
-      assertThat(adapter.authenticatedAsCurrentUser()).isSameAs(expected);
-    }
-
-    @Test
-    void impersonationReturnsConfiguredTemplate() {
-      AtlassianHost host = sampleHost();
-      AtlassianHostUser user = sampleUser(host);
-      RestTemplate expected = new RestTemplate();
-      adapter.configureImpersonation(expected);
-
-      assertThat(adapter.impersonation(user)).isSameAs(expected);
-    }
+  @ParameterizedTest(name = DISPLAY_NAME)
+  @MethodSource(ADAPTERS_SOURCE)
+  void authenticatedAsAddonReturnsConfiguredTemplate(StubProductAdapterBase adapter) {
+    AtlassianHost host = sampleHost();
+    RestTemplate expected = new RestTemplate();
+    adapter.configureAddon(expected);
 
-    @Test
-    void impersonationReceivesHostUser() {
-      AtlassianHost host = sampleHost();
-      AtlassianHostUser user = sampleUser(host);
-      adapter.impersonation(user);
-
-      assertThat(adapter.lastImpersonationUser).isSameAs(user);
-    }
+    assertThat(adapter.authenticatedAsAddon(host)).isSameAs(expected);
   }
 
-  @Nested
-  class ConfluenceProductAdapterContract {
-
-    private StubConfluenceProductAdapter adapter;
+  @ParameterizedTest(name = DISPLAY_NAME)
+  @MethodSource(ADAPTERS_SOURCE)
+  void authenticatedAsAddonReceivesHost(StubProductAdapterBase adapter) {
+    AtlassianHost host = sampleHost();
+    adapter.authenticatedAsAddon(host);
 
-    @BeforeEach
-    void createAdapter() {
-      adapter = new StubConfluenceProductAdapter();
-    }
-
-    @Test
-    void authenticatedAsAddonReturnsConfiguredTemplate() {
-      AtlassianHost host = sampleHost();
-      RestTemplate expected = new RestTemplate();
-      adapter.configureAddon(expected);
-
-      assertThat(adapter.authenticatedAsAddon(host)).isSameAs(expected);
-    }
-
-    @Test
-    void authenticatedAsAddonReceivesHost() {
-      AtlassianHost host = sampleHost();
-      adapter.authenticatedAsAddon(host);
-
-      assertThat(adapter.lastAddonHost).isSameAs(host);
-    }
-
-    @Test
-    void authenticatedAsCurrentUserReturnsConfiguredTemplate() {
-      RestTemplate expected = new RestTemplate();
-      adapter.configureCurrentUser(expected);
-
-      assertThat(adapter.authenticatedAsCurrentUser()).isSameAs(expected);
-    }
-
-    @Test
-    void impersonationReturnsConfiguredTemplate() {
-      AtlassianHost host = sampleHost();
-      AtlassianHostUser user = sampleUser(host);
-      RestTemplate expected = new RestTemplate();
-      adapter.configureImpersonation(expected);
-
-      assertThat(adapter.impersonation(user)).isSameAs(expected);
-    }
-
-    @Test
-    void impersonationReceivesHostUser() {
-      AtlassianHost host = sampleHost();
-      AtlassianHostUser user = sampleUser(host);
-      adapter.impersonation(user);
-
-      assertThat(adapter.lastImpersonationUser).isSameAs(user);
-    }
+    assertThat(adapter.lastAddonHost).isSameAs(host);
   }
 
-  @Nested
-  class OtherProductAdapterContract {
+  @ParameterizedTest(name = DISPLAY_NAME)
+  @MethodSource(ADAPTERS_SOURCE)
+  void authenticatedAsCurrentUserReturnsConfiguredTemplate(StubProductAdapterBase adapter) {
+    RestTemplate expected = new RestTemplate();
+    adapter.configureCurrentUser(expected);
 
-    private StubOtherProductAdapter adapter;
-
-    @BeforeEach
-    void createAdapter() {
-      adapter = new StubOtherProductAdapter();
-    }
-
-    @Test
-    void authenticatedAsAddonReturnsConfiguredTemplate() {
-      AtlassianHost host = sampleHost();
-      RestTemplate expected = new RestTemplate();
-      adapter.configureAddon(expected);
-
-      assertThat(adapter.authenticatedAsAddon(host)).isSameAs(expected);
-    }
-
-    @Test
-    void authenticatedAsAddonReceivesHost() {
-      AtlassianHost host = sampleHost();
-      adapter.authenticatedAsAddon(host);
-
-      assertThat(adapter.lastAddonHost).isSameAs(host);
-    }
-
-    @Test
-    void authenticatedAsCurrentUserReturnsConfiguredTemplate() {
-      RestTemplate expected = new RestTemplate();
-      adapter.configureCurrentUser(expected);
-
-      assertThat(adapter.authenticatedAsCurrentUser()).isSameAs(expected);
-    }
+    assertThat(adapter.authenticatedAsCurrentUser()).isSameAs(expected);
+  }
 
-    @Test
-    void impersonationReturnsConfiguredTemplate() {
-      AtlassianHost host = sampleHost();
-      AtlassianHostUser user = sampleUser(host);
-      RestTemplate expected = new RestTemplate();
-      adapter.configureImpersonation(expected);
+  @ParameterizedTest(name = DISPLAY_NAME)
+  @MethodSource(ADAPTERS_SOURCE)
+  void impersonationReturnsConfiguredTemplate(StubProductAdapterBase adapter) {
+    AtlassianHost host = sampleHost();
+    AtlassianHostUser user = sampleUser(host);
+    RestTemplate expected = new RestTemplate();
+    adapter.configureImpersonation(expected);
 
-      assertThat(adapter.impersonation(user)).isSameAs(expected);
-    }
+    assertThat(adapter.impersonation(user)).isSameAs(expected);
+  }
 
-    @Test
-    void impersonationReceivesHostUser() {
-      AtlassianHost host = sampleHost();
-      AtlassianHostUser user = sampleUser(host);
-      adapter.impersonation(user);
+  @ParameterizedTest(name = DISPLAY_NAME)
+  @MethodSource(ADAPTERS_SOURCE)
+  void impersonationReceivesHostUser(StubProductAdapterBase adapter) {
+    AtlassianHost host = sampleHost();
+    AtlassianHostUser user = sampleUser(host);
+    adapter.impersonation(user);
 
-      assertThat(adapter.lastImpersonationUser).isSameAs(user);
-    }
+    assertThat(adapter.lastImpersonationUser).isSameAs(user);
   }
 
-  private static class StubProductAdapterBase {
+  private abstract static class StubProductAdapterBase {
     AtlassianHost lastAddonHost;
     AtlassianHostUser lastImpersonationUser;
     private RestTemplate addonClient = new RestTemplate();
     private RestTemplate currentUserClient = new RestTemplate();
     private RestTemplate impersonationClient = new RestTemplate();
 
+    abstract RestTemplate authenticatedAsAddon(AtlassianHost host);
+
+    abstract RestTemplate authenticatedAsCurrentUser();
+
+    abstract RestTemplate impersonation(AtlassianHostUser hostUser);
+
     void configureAddon(RestTemplate template) {
       addonClient = template;
     }