diff --git a/tests/test_dom_traverse.cpp b/tests/test_dom_traverse.cpp
index e42846f..83afec8 100644
--- a/tests/test_dom_traverse.cpp
+++ b/tests/test_dom_traverse.cpp
@@ -1048,14 +1048,14 @@ TEST_XML(dom_unspecified_bool_coverage, "<node attr='value'>text</node>")
 {
 	xml_node node = doc.first_child();
 
-	node(0);
-	node.first_attribute()(0);
-	node.text()(0);
+	static_cast<void (*)(xml_node***)>(node)(0);
+	static_cast<void (*)(xml_attribute***)>(node.first_attribute())(0);
+	static_cast<void (*)(xml_text***)>(node.text())(0);
 
 #ifndef PUGIXML_NO_XPATH
 	xpath_query q(STR("/node"));
 
-	q(0);
-	q.evaluate_node(doc)(0);
+	static_cast<void (*)(xpath_query***)>(q)(0);
+	static_cast<void (*)(xpath_node***)>(q.evaluate_node(doc))(0);
 #endif
 }
diff --git a/tests/test_xpath.cpp b/tests/test_xpath.cpp
index 80115b8..a65ee37 100644
--- a/tests/test_xpath.cpp
+++ b/tests/test_xpath.cpp
@@ -110,7 +110,7 @@ TEST_XML(xpath_sort_attributes, "<node/>")
 	n.append_attribute(STR("attr3"));
 	n.insert_attribute_before(STR("attr1"), n.attribute(STR("attr2")));
 
-	xpath_node_set ns = n.select_nodes(STR("@*"));
+	xpath_node_set ns = n.select_nodes(STR("@* | @*"));
 
 	ns.sort(true);
 	xpath_node_set reverse_sorted = ns;
@@ -122,6 +122,25 @@ TEST_XML(xpath_sort_attributes, "<node/>")
 	xpath_node_set_tester(reverse_sorted, "reverse sorted order failed") % 5 % 4 % 3;
 }
 
+TEST_XML(xpath_sort_attributes_docorder, "<node attr1='' attr2='value' attr4='value' />")
+{
+	xml_node n = doc.child(STR("node"));
+
+	n.first_attribute().set_name(STR("attribute1"));
+	n.insert_attribute_after(STR("attr3"), n.attribute(STR("attr2")));
+
+	xpath_node_set ns = n.select_nodes(STR("@* | @*"));
+
+	ns.sort(true);
+	xpath_node_set reverse_sorted = ns;
+
+	ns.sort(false);
+	xpath_node_set sorted = ns;
+
+	xpath_node_set_tester(sorted, "sorted order failed") % 3 % 4 % 5 % 6;
+	xpath_node_set_tester(reverse_sorted, "reverse sorted order failed") % 6 % 5 % 4 % 3;
+}
+
 TEST(xpath_sort_random_medium)
 {
 	xml_document doc;
@@ -629,4 +648,26 @@ TEST(xpath_allocate_string_out_of_memory)
 	}
 #endif
 }
+
+TEST(xpath_remove_duplicates)
+{
+	xml_document doc;
+
+	for (int i = 0; i < 20; ++i)
+	{
+		doc.append_child(STR("node2"));
+		doc.prepend_child(STR("node1"));
+	}
+
+	xpath_node_set ns = doc.select_nodes(STR("/node2/preceding::* | //node1 | /node() | /* | /node1/following-sibling::*"));
+
+	ns.sort();
+
+	{
+		xpath_node_set_tester tester(ns, "sorted order failed");
+
+		for (int i = 0; i < 40; ++i)
+			tester % (2 + i);
+	}
+}
 #endif
diff --git a/tests/test_xpath_variables.cpp b/tests/test_xpath_variables.cpp
index 39a4f05..728eaa9 100644
--- a/tests/test_xpath_variables.cpp
+++ b/tests/test_xpath_variables.cpp
@@ -276,6 +276,29 @@ TEST(xpath_variables_long_name)
 	CHECK_XPATH_BOOLEAN_VAR(xml_node(), STR("$abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"), &set, true);
 }
 
+TEST(xpath_variables_long_name_out_of_memory)
+{
+	xpath_variable_set set;
+	set.set(STR("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"), true);
+
+	test_runner::_memory_fail_threshold = 4096 + 128;
+
+#ifdef PUGIXML_NO_EXCEPTIONS
+	xpath_query q(STR("$abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"), &set);
+	CHECK(!q);
+#else
+	try
+	{
+		xpath_query q(STR("$abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"), &set);
+
+		CHECK_FORCE_FAIL("Expected exception");
+	}
+	catch (const xpath_exception&)
+	{
+	}
+#endif
+}
+
 TEST_XML(xpath_variables_select, "<node attr='1'/><node attr='2'/>")
 {
 	xpath_variable_set set;