[test] adding testcases for get method of buffer

test/test_buffer.py

@@ -1,18 +1,19 @@
 import pytest
 import numpy as np
+from IPython import embed
 
-from usbdaq import RingBuffer
+from pyrelacs.dataio.circbuffer import CircBuffer
 
 
 def test_init():
-    buff = RingBuffer(1000, 2)
+    buff = CircBuffer(1000, 2)
 
     assert buff.size == 1000
     assert buff.channel_count == 2
 
 
 def test_hasvalue():
-    buff = RingBuffer(1000, 2)
+    buff = CircBuffer(1000, 2)
 
     assert buff.has_value(0, 0) == False
     assert buff.has_value(-1, 0) == False
@@ -39,18 +40,59 @@ def test_hasvalue():
 
 
 def test_validrange():
-    pass
+    buff = CircBuffer(1000, 2)
 
+    # without any values the range is (0, 0)
+    assert buff.valid_range() == (0, 0)
 
-def test_write():
-    buff = RingBuffer(1000, 2)
+    buff.append(0, 0)
+    assert buff.valid_range() == (0, 1)
 
-    samplecount = 1000
+    for i in range(100):
+        buff.append(i, 0)
+
+    assert buff.valid_range() == (0, 101)
+
+    for i in range(1000):
+        buff.append(i, 0)
+
+    assert buff.valid_range() == (0, 1000)
 
 
 def test_get():
-    pass
+    buff = CircBuffer(1000, 2)
+
+    # with no items written to the buffer
+    with pytest.raises(IndexError):
+        item = buff.get(index=-1)
+
+    buff.append(10, 0)
+    item = buff.get(index=-1)
+    assert item == 10
+
+    # Check if index is not written jet
+    with pytest.raises(IndexError):
+        item = buff.get(index=10)
+
+    for i in range(1000):
+        buff.append(i, 0)
+    item = buff.get(index=-1)
+    # the first item should be 999.0 because of we append a value in the earlier test
+    assert item == 999.0
+
+    with pytest.raises(IndexError):
+        item = buff.get(10001)
 
 
 def test_read():
     pass
+
+
+def test_write():
+    buff = CircBuffer(1000, 2)
+
+    samplecount = 1000
+
+
+if __name__ == "__main__":
+    test_get()