Implement the Stream Expansion scenario

tests/integration/example.test.env.yaml

@@ -65,7 +65,8 @@ testdata:
     module: testmodule
     branch: test-no-components-branch
   stream_expansion:
-    # For this scenario it's necessary to use testmodule2 as a module and it doesn't make sense
-    # reusing a former build
+    # testmodule2 buildrequires and requires 2 streams from testmodule.
+    # These are expected to be built already.
+    # For this scenario reusing former builds doesn't make sense.
     module: testmodule2
     branch: test-stream-expans-branch

tests/integration/test_stream_expansion.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# SPDX-License-Identifier: MIT
+
+
+def test_stream_expansion(pkg_util, scenario, repo, koji):
+    """
+
+    Submit the testmodule2 build with `rhpkg-stage module-build`
+        The produced builds can be cancelled after the test cases have been verified to save on
+        resources and time
+
+    Checks:
+     * Verify two module builds were generated from this build submission
+
+    """
+    repo.bump()
+    builds = pkg_util.run()
+
+    assert len(builds) == 2
+    for build in builds:
+        pkg_util.cancel(build)