Merge #537

537: tests: add a test for clear on message based resources r=MatthieuDartiailh a=MatthieuDartiailh

- [x] Executed ``black . && isort -c . && flake8`` with no errors


Co-authored-by: MatthieuDartiailh <marul@laposte.net>

azure-pipelines.yml

@@ -46,7 +46,7 @@ steps:
     echo Install pytest and co
     pip install pytest pytest-azurepipelines pytest-cov
     echo Run pytest
-    python -X dev -m pytest --pyargs pyvisa --cov pyvisa --cov-report xml
+    python -X dev -m pytest --pyargs pyvisa --cov pyvisa --cov-report xml -v
   displayName: 'Run tests'
 
 - script: |

pyvisa/testsuite/keysight_assisted_tests/messagebased_resource_utils.py

@@ -205,6 +205,18 @@ def test_write_raw_read_raw(self):
         self.instr.write_raw(b"SEND\n")
         assert self.instr.read_raw(size=2) == b"test\n"
 
+    def test_clear(self):
+        """Test clearing the incoming buffer.
+
+        """
+        self.instr.write_raw(b"RECEIVE\n")
+        self.instr.write_raw(b"test\n")
+        self.instr.write_raw(b"SEND\n")
+        self.instr.clear()
+        self.instr.timeout = 10
+        with pytest.raises(errors.VisaIOError):
+            self.instr.read_raw()
+
     def test_write_read(self):
         """Test writing and reading.