Add tests for reading edge and vertex data from single input in PG, i…

…mplementation to follow. (#2154)

#2109 describes additional use cases that PropertyGraph needs to support.  This PR adds tests to ensure those are supported.

Authors:
  - Rick Ratzel (https://github.com/rlratzel)

Approvers:
  - Brad Rees (https://github.com/BradReesWork)
  - Alex Barghi (https://github.com/alexbarghi-nv)
  - Vibhu Jawa (https://github.com/VibhuJawa)

URL: #2154

python/cugraph/cugraph/tests/test_property_graph.py

@@ -121,6 +121,40 @@
     ],
 }
 
+
+# CSV file contents used for testing various CSV-based use cases.
+# These are to be used for test_single_csv_multi_vertex_edge_attrs()
+edges_edgeprops_vertexprops_csv = """
+src dst edge_attr1 edge_attr2 src_attr1 src_attr2 dst_attr1 dst_attr2
+0 1 87 "a" 3.1 "v0" 1.3 "v1"
+0 2 88 "b" 3.2 "v0" 1.1 "v2"
+2 1 89 "c" 2.3 "v2" 1.9 "v1"
+"""
+
+vertexprops_csv = """
+vertex attr1 attr2
+0 32 dog
+1 54 fish
+2 87 cat
+3 12 snake
+4 901 gecko
+"""
+
+edgeprops_csv = """
+v_src v_dst edge_id
+0 1 123
+0 2 432
+2 1 789
+"""
+
+edgeid_edgeprops_csv = """
+edge_id attr1 attr2
+123 'PUT' 21.32
+432 'POST' 21.44
+789 'GET' 22.03
+"""
+
+
 # Placeholder for a directed Graph instance. This is not constructed here in
 # order to prevent cuGraph code from running on import, which would prevent
 # proper pytest collection if an exception is raised. See setup_function().
@@ -1498,6 +1532,14 @@ def test_renumber_edges_by_type(dataset1_PropertyGraph):
     assert empty_pG.renumber_edges_by_type() is None
 
 
+@pytest.mark.skip(reason="feature not implemented")
+def test_single_csv_multi_vertex_edge_attrs():
+    """
+    Read an edgelist CSV that contains both edge and vertex attrs
+    """
+    pass
+
+
 # =============================================================================
 # Benchmarks
 # =============================================================================