Fix calculation algorithm

tests/test_speed_calculator.py

@@ -12,14 +12,14 @@ from pytchat.processors.speed_calculator import SpeedCalculator
 parser = Parser()
 
 def test_speed_1(mocker):
-    '''test speed normal
+    '''test speed calculation with normal json.
     test json has 15 chatdata, duration is 30 seconds,
     so the speed of chatdata is 30 chats/minute.
     '''
 
-    processor = SpeedCalculator(capacity=30,video_id="")
+    processor = SpeedCalculator(capacity=30)
 
-    _json = _open_file("tests/testdata/speed/speedtest1.json")
+    _json = _open_file("tests/testdata/speed/speedtest_normal.json")
 
     _, chatdata = parser.parse(json.loads(_json))
     data = {
@@ -31,13 +31,27 @@ def test_speed_1(mocker):
     assert 30 == ret
 
 def test_speed_2(mocker):
-    '''test speed with no valid chat data
-    
+    '''test speed calculation with no valid chat data.
     '''
+    processor = SpeedCalculator(capacity=30)
 
-    processor = SpeedCalculator(capacity=30,video_id="")
+    _json = _open_file("tests/testdata/speed/speedtest_undefined.json")
 
-    _json = _open_file("tests/testdata/speed/speedtest_none.json")
+    _, chatdata = parser.parse(json.loads(_json))
+    data = {
+        "video_id" : "",
+        "timeout" : 10,
+        "chatdata" : chatdata
+    }
+    ret = processor.process([data])
+    assert 0 == ret
+    
+def test_speed_3(mocker):
+    '''test speed calculation with empty data.
+    '''
+    processor = SpeedCalculator(capacity=30)
+
+    _json = _open_file("tests/testdata/speed/speedtest_empty.json")
 
     _, chatdata = parser.parse(json.loads(_json))
     data = {
@@ -52,3 +66,4 @@ def test_speed_2(mocker):
 def _open_file(path):
     with open(path,mode ='r',encoding = 'utf-8') as f:
         return f.read()
+_put_chatdata