Update tests to work with the earlier consumption of stdin etc.

Note: this adds an element to vulture's whitelist that vulture
mistakenly identified as unused.

scripts/dev/run_vulture.py

@@ -82,6 +82,7 @@ def whitelist_generator():  # noqa
     yield 'qutebrowser.utils.jinja.Loader.get_source'
     yield 'qutebrowser.utils.log.QtWarningFilter.filter'
     yield 'qutebrowser.browser.pdfjs.is_available'
+    yield 'qutebrowser.misc.guiprocess.spawn_output'
     yield 'QEvent.posted'
     yield 'log_stack'  # from message.py
     yield 'propagate'  # logging.getLogger('...).propagate = False

tests/unit/misc/test_guiprocess.py

@@ -19,7 +19,6 @@
 
 """Tests for qutebrowser.misc.guiprocess."""
 
-import json
 import logging
 
 import pytest
@@ -27,6 +26,7 @@ from PyQt5.QtCore import QProcess, QIODevice
 
 from qutebrowser.misc import guiprocess
 from qutebrowser.utils import usertypes
+from qutebrowser.browser import qutescheme
 
 
 @pytest.fixture()
@@ -60,7 +60,7 @@ def test_start(proc, qtbot, message_mock, py_proc):
         proc.start(*argv)
 
     assert not message_mock.messages
-    assert bytes(proc._proc.readAll()).rstrip() == b'test'
+    assert qutescheme.spawn_output == proc.spawn_format(0, 0, stdout="test")
 
 
 def test_start_verbose(proc, qtbot, message_mock, py_proc):
@@ -77,7 +77,24 @@ def test_start_verbose(proc, qtbot, message_mock, py_proc):
     assert msgs[1].level == usertypes.MessageLevel.info
     assert msgs[0].text.startswith("Executing:")
     assert msgs[1].text == "Testprocess exited successfully."
-    assert bytes(proc._proc.readAll()).rstrip() == b'test'
+    assert qutescheme.spawn_output == proc.spawn_format(0, 0, stdout="test")
+
+
+def test_start_output(proc, qtbot, message_mock, py_proc):
+    """Test starting a process verbosely."""
+    proc.verbose = True
+
+    with qtbot.waitSignals([proc.started, proc.finished], timeout=10000,
+                           order='strict'):
+        argv = py_proc("import sys; print('test'); sys.exit(0)")
+        proc.start(*argv)
+
+    msgs = message_mock.messages
+    assert msgs[0].level == usertypes.MessageLevel.info
+    assert msgs[1].level == usertypes.MessageLevel.info
+    assert msgs[0].text.startswith("Executing:")
+    assert msgs[1].text == "Testprocess exited successfully."
+    assert qutescheme.spawn_output == proc.spawn_format(0, 0, stdout="test")
 
 
 def test_start_env(monkeypatch, qtbot, py_proc):
@@ -99,10 +116,9 @@ def test_start_env(monkeypatch, qtbot, py_proc):
                            order='strict'):
         proc.start(*argv)
 
-    data = bytes(proc._proc.readAll()).decode('utf-8')
-    ret_env = json.loads(data)
-    assert 'QUTEBROWSER_TEST_1' in ret_env
-    assert 'QUTEBROWSER_TEST_2' in ret_env
+    data = qutescheme.spawn_output
+    assert 'QUTEBROWSER_TEST_1' in data
+    assert 'QUTEBROWSER_TEST_2' in data
 
 
 @pytest.mark.qt_log_ignore('QIODevice::read.*: WriteOnly device')