From f80eab61dd26d52187befae8d97a59e1849d0e4f Mon Sep 17 00:00:00 2001
From: Jesper Friis <jesper.friis@sintef.no>
Date: Thu, 29 Feb 2024 22:31:13 +0100
Subject: [PATCH 1/2] Added test for literal triples.

---
 docs/api_reference/testutils.md |  3 +++
 tests/test_triplestore.py       | 46 +++++++++++++++++++++++++++++++++
 tripper/testutils.py            | 12 +++++++++
 3 files changed, 61 insertions(+)
 create mode 100644 docs/api_reference/testutils.md
 create mode 100644 tripper/testutils.py

diff --git a/docs/api_reference/testutils.md b/docs/api_reference/testutils.md
new file mode 100644
index 00000000..ffbfd7dd
--- /dev/null
+++ b/docs/api_reference/testutils.md
@@ -0,0 +1,3 @@
+# testutils
+
+::: tripper.testutils
diff --git a/tests/test_triplestore.py b/tests/test_triplestore.py
index c10f6b4b..66259722 100644
--- a/tests/test_triplestore.py
+++ b/tests/test_triplestore.py
@@ -275,3 +275,49 @@ def test_backend_sparqlwrapper_methods() -> None:
             (EX.a, SKOS.prefLabel, Literal("An a class.", lang="en")),
         ]
     )
+
+
+# if True:
+def test_find_literal_triples() -> None:
+    """Test finding literals."""
+    from tripper import RDF, XSD, Literal, Triplestore
+    from tripper.testutils import ontodir
+
+    ts = Triplestore("rdflib")
+    FAM = ts.bind("ex", "http://onto-ns.com/ontologies/examples/family#")
+    ts.parse(ontodir / "family.ttl")
+    ts.add_triples(
+        [
+            (FAM.Ola, RDF.type, FAM.Son),
+            (FAM.Ola, FAM.hasName, Literal("Ola")),
+            (FAM.Ola, FAM.hasAge, Literal(18)),
+            (FAM.Ola, FAM.hasWeight, Literal(68.5)),
+            (FAM.Kari, RDF.type, FAM.Dauther),
+            (FAM.Kari, FAM.hasName, Literal("Kari")),
+            (FAM.Kari, FAM.hasAge, Literal(18)),
+            (FAM.Kari, FAM.hasWeight, Literal(66.2)),
+            (FAM.Per, RDF.type, FAM.Father),
+            (FAM.Per, FAM.hasName, Literal("Per")),
+            (FAM.Per, FAM.hasAge, Literal(49)),
+            (FAM.Per, FAM.hasWeight, Literal(83.8)),
+            (FAM.Per, FAM.hasChild, FAM.Ola),
+            (FAM.Per, FAM.hasChild, FAM.Kari),
+        ]
+    )
+    assert set(
+        ts.subjects(
+            predicate=FAM.hasAge,
+            object=Literal(18, datatype=XSD.integer),
+        )
+    ) == set([FAM.Ola, FAM.Kari])
+
+    assert set(
+        ts.triples(
+            predicate=FAM.hasName,
+            object=Literal("Per", datatype=XSD.string),
+        )
+    ) == set(
+        [
+            (FAM.Per, FAM.hasName, Literal("Per")),
+        ]
+    )
diff --git a/tripper/testutils.py b/tripper/testutils.py
new file mode 100644
index 00000000..2ac5be64
--- /dev/null
+++ b/tripper/testutils.py
@@ -0,0 +1,12 @@
+"""Motule primarly intended to be imported by tests.
+
+It defines some directories and some utility functions that can be used
+with or without conftest.
+"""
+
+from pathlib import Path
+
+rootdir = Path(__file__).resolve().parent.parent
+testdir = rootdir / "tests"
+ontodir = testdir / "ontologies"
+outdir = testdir / "output"

From 498a47a25f9fc8262b84f21830b1fb4556333273 Mon Sep 17 00:00:00 2001
From: Jesper Friis <jesper.friis@sintef.no>
Date: Sun, 3 Mar 2024 12:44:12 +0100
Subject: [PATCH 2/2] Skip test_find_literal_triples() if rdflib is not
 installed.

---
 tests/test_triplestore.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tests/test_triplestore.py b/tests/test_triplestore.py
index 66259722..463ecbe4 100644
--- a/tests/test_triplestore.py
+++ b/tests/test_triplestore.py
@@ -280,6 +280,8 @@ def test_backend_sparqlwrapper_methods() -> None:
 # if True:
 def test_find_literal_triples() -> None:
     """Test finding literals."""
+    pytest.importorskip("rdflib")
+
     from tripper import RDF, XSD, Literal, Triplestore
     from tripper.testutils import ontodir