Add one more test to increase code coverage

pygmt/clib/session.py

@@ -620,6 +620,8 @@ def call_module(self, module: str, args: str | list[str]):
 
  Raises
  ------
+ GMTInvalidInput
+ If the ``args`` argument is not a string or a list of strings.
  GMTCLibError
  If the returned status code of the function is non-zero.
  """

pygmt/tests/test_clib.py

@@ -165,6 +165,15 @@ def test_call_module_empty_argument():
  lib.call_module("defaults", [])
 
 
+def test_call_module_invalid_argument_type():
+ """
+ call_module only accepts a string or a list of strings as module arguments.
+ """
+ with clib.Session() as lib:
+ with pytest.raises(GMTInvalidInput):
+ lib.call_module("get", ("FONT_TITLE", "FONT_TAG"))
+
+
 def test_call_module_invalid_arguments():
  """
  call_module should fail for invalid module arguments.