new mock packages

var/spack/repos/builtin.mock/packages/parallel-package-a/package.py

@@ -0,0 +1,29 @@
+# Copyright Spack Project Developers. See COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+import time
+
+from llnl.util.filesystem import touch
+
+from spack.package import *
+
+
+class ParallelPackageA(Package):
+    """This is a fake vtk-m package used to demonstrate virtual package providers
+    with dependencies."""
+
+    homepage = "http://www.example.com"
+    has_code = False
+
+    depends_on("parallel-package-b")
+    depends_on("parallel-package-c")
+
+    version("1.0")
+
+    def install(self, spec, prefix):
+        print("I'm building!")
+        time.sleep(2)
+        print("I'm done!")
+
+        touch(prefix.dummy_file)

var/spack/repos/builtin.mock/packages/parallel-package-b/package.py

@@ -0,0 +1,26 @@
+# Copyright Spack Project Developers. See COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+import time
+
+from llnl.util.filesystem import touch
+
+from spack.package import *
+
+
+class ParallelPackageB(Package):
+    """This is a fake vtk-m package used to demonstrate virtual package providers
+    with dependencies."""
+
+    homepage = "http://www.example.com"
+    has_code = False
+
+    version("1.0")
+
+    def install(self, spec, prefix):
+        print("I'm building!")
+        time.sleep(6)
+        print("I'm done!")
+
+        touch(prefix.dummy_file)

var/spack/repos/builtin.mock/packages/parallel-package-c/package.py

@@ -0,0 +1,26 @@
+# Copyright Spack Project Developers. See COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+import time
+
+from llnl.util.filesystem import touch
+
+from spack.package import *
+
+
+class ParallelPackageC(Package):
+    """This is a fake vtk-m package used to demonstrate virtual package providers
+    with dependencies."""
+
+    homepage = "http://www.example.com"
+    has_code = False
+
+    version("1.0")
+
+    def install(self, spec, prefix):
+        print("Package 3 building!")
+        time.sleep(2)
+        print("Ideally shouldnt get here and it should fail")
+
+        touch(prefix.dummy_file)