diff --git a/slycot/tests/test_exceptions.py b/slycot/tests/test_exceptions.py
index b370c34e..28614ce5 100644
--- a/slycot/tests/test_exceptions.py
+++ b/slycot/tests/test_exceptions.py
@@ -93,6 +93,55 @@ def test_unhandled_info_iwarn():
     assert wm[1].message.info == 0
 
 
+def test_info_standard_i():
+    """Test the handling of standard "`info = -i`
+
+    Raises
+    ------
+    SlycotError
+        :info = -i: Non-standard msg, info is {info}, -i is -{i}
+    """
+    # No i in check_vars: keep silent
+    raise_if_slycot_error(-1, docstring=test_info_standard_i.__doc__,
+        checkvars={'a': 1})
+    # -i does not match
+    raise_if_slycot_error(-1, docstring=test_info_standard_i.__doc__,
+        checkvars={'i': 2})
+    # -i matches, raise the error
+    with pytest.raises(SlycotError) as ex_info:
+        raise_if_slycot_error(-1, docstring=test_info_standard_i.__doc__,
+            checkvars={'i': 1})
+    assert str(ex_info.value) == "\nNon-standard msg, info is -1, -i is -1"
+
+
+def test_infospec_nameerror():
+    """Test infospec with unknown variable.
+
+    Raises
+    ------
+    SlycotError
+        :info = v: We do not know {v}
+    """
+    with pytest.raises(RuntimeError) as ex_info:
+        raise_if_slycot_error(-1, docstring=test_infospec_nameerror.__doc__,
+            checkvars={'a': 1})
+    assert str(ex_info.value) == "Unknown variable in infospec: info = v"
+
+
+def test_infospec_syntaxerror():
+    """Test invalid infospec.
+
+    Raises
+    ------
+    SlycotError
+        :info i: Invalid expression
+    """
+    with pytest.raises(RuntimeError) as ex_info:
+        raise_if_slycot_error(-1, docstring=test_infospec_syntaxerror.__doc__,
+            checkvars={'i': 1})
+    assert str(ex_info.value) == "Invalid infospec: info i"
+
+
 # Test code for test_xerbla_override
 CODE = """
 import sys