tests: Raise if wait_for is used without kwargs.

Otherwise wait_for would return immediately because matches is empty so
any(matches) is True.

tests/integration/test_testprocess.py

@@ -136,6 +136,14 @@ class TestWaitFor:
         with pytest.raises(testprocess.WaitForTimeout):
             pyproc.wait_for(data="foobar", timeout=100)
 
+    def test_no_kwargs(self, pyproc):
+        """Using wait_for without kwargs should raise an exception.
+
+        Otherwise it'd match automatically because of the all(matches).
+        """
+        with pytest.raises(TypeError):
+            pyproc.wait_for()
+
 
 class TestEnsureNotLogged:
 

tests/integration/testprocess.py

@@ -254,6 +254,8 @@ class Process(QObject):
                 timeout = 15000
             else:
                 timeout = 5000
+        if not kwargs:
+            raise TypeError("No keyword arguments given!")
         for key in kwargs:
             assert key in self.KEYS