Update unit tests

Author: stephane-caron

tests/test_live_plot.py

@@ -57,13 +57,21 @@ def test_add_twice(self):
     def test_send(self):
         plot = self.make_test_plot()
         plot.send("foo", 1.0)
-        self.assertFalse("foo" in plot.series)
-        plot.add_left("foo")
         self.assertTrue("foo" in plot.series)
         plot.send("foo", 2.0)
         plot.send("foo", 3.0)
         self.assertAlmostEqual(plot.series["foo"][-1], 3.0)
 
+    def test_push(self):
+        plot = self.make_test_plot()
+        plot.push("foo", 1.0)
+        self.assertFalse("foo" in plot.series)
+        plot.add_left("foo")
+        self.assertTrue("foo" in plot.series)
+        plot.push("foo", 2.0)
+        plot.push("foo", 3.0)
+        self.assertAlmostEqual(plot.series["foo"][-1], 3.0)
+
     def test_update(self):
         plot = self.make_test_plot()
         plot.add_left("foo")