diff --git a/tests/test_xpath_functions.cpp b/tests/test_xpath_functions.cpp
index 9cf8164..1ab4d71 100644
--- a/tests/test_xpath_functions.cpp
+++ b/tests/test_xpath_functions.cpp
@@ -688,6 +688,9 @@ TEST(xpath_function_arguments)
 
 	// whitespace after function name
 	CHECK_XPATH_BOOLEAN(c, "true ()", true);
+
+	// too many arguments
+	CHECK_XPATH_FAIL("round(1, 2, 3, 4, 5, 6)");
 }
 
 TEST_XML_FLAGS(xpath_string_value, "<node><c1>pcdata</c1><c2><child/></c2><c3 attr='avalue'/><c4><?target pivalue?></c4><c5><!--comment--></c5><c6><![CDATA[cdata]]></c6></node>", parse_default | parse_pi | parse_comments)
diff --git a/tests/test_xpath_parse.cpp b/tests/test_xpath_parse.cpp
index cce3085..38032ea 100644
--- a/tests/test_xpath_parse.cpp
+++ b/tests/test_xpath_parse.cpp
@@ -37,6 +37,7 @@ TEST(xpath_number_error)
 TEST(xpath_variables)
 {
 	CHECK_XPATH_FAIL("$var"); // not implemented
+	CHECK_XPATH_FAIL("$1");
 }
 
 TEST(xpath_empty_expression)
@@ -49,4 +50,36 @@ TEST(xpath_lexer_error)
 	CHECK_XPATH_FAIL("!");
 }
 
+TEST(xpath_unmatched_braces)
+{
+	CHECK_XPATH_FAIL("node[");
+	CHECK_XPATH_FAIL("node[1");
+	CHECK_XPATH_FAIL("node[]]");
+	CHECK_XPATH_FAIL("node(");
+	CHECK_XPATH_FAIL("node(()");
+	CHECK_XPATH_FAIL("(node)[1");
+	CHECK_XPATH_FAIL("(1");
+}
+
+TEST(xpath_incorrect_step)
+{
+	CHECK_XPATH_FAIL("child::1");
+	CHECK_XPATH_FAIL("something::*");
+}
+
+TEST(xpath_semantics_error)
+{
+	CHECK_XPATH_FAIL("1[1]");
+	CHECK_XPATH_FAIL("1 | 1");
+}
+
+TEST(xpath_semantics_posinv) // coverage for contains()
+{
+	xpath_query("(node)[substring(1, 2, 3)]");
+	xpath_query("(node)[concat(1, 2, 3, 4)]");
+	xpath_query("(node)[count(foo)]");
+	xpath_query("(node)[local-name()]");
+	xpath_query("(node)[(node)[1]]");
+}
+
 #endif