Add tests for ``Printer`` classes which are not covered yet implicitly through ``test_writer``

1 files changed, 32 insertions, 0 deletions

diff --git a/tests/pyreverse/test_printer.py b/tests/pyreverse/test_printer.py
new file mode 100644
index 000000000..d67107dbd
--- /dev/null
+++ b/tests/pyreverse/test_printer.py
@@ -0,0 +1,32 @@
+# Copyright (c) 2021 Andreas Finkler <andi.finkler@gmail.com>
+
+# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+# For details: https://github.com/PyCQA/pylint/blob/master/LICENSE
+
+from typing import Type
+
+import pytest
+
+from pylint.pyreverse.dot_printer import DotPrinter
+from pylint.pyreverse.printer import Layout, Printer
+from pylint.pyreverse.vcg_printer import VCGPrinter
+
+
+@pytest.mark.parametrize(
+    "layout, printer_class, expected_content, line_index",
+    [
+        (Layout.TOP_TO_BOTTOM, DotPrinter, "rankdir=TB", -2),
+        (Layout.BOTTOM_TO_TOP, DotPrinter, "rankdir=BT", -2),
+        (Layout.LEFT_TO_RIGHT, DotPrinter, "rankdir=LR", -2),
+        (Layout.RIGHT_TO_LEFT, DotPrinter, "rankdir=RL", -2),
+        (Layout.TOP_TO_BOTTOM, VCGPrinter, "orientation:top_to_bottom", -1),
+        (Layout.BOTTOM_TO_TOP, VCGPrinter, "orientation:bottom_to_top", -1),
+        (Layout.LEFT_TO_RIGHT, VCGPrinter, "orientation:left_to_right", -1),
+        (Layout.RIGHT_TO_LEFT, VCGPrinter, "orientation:right_to_left", -1),
+    ],
+)
+def test_explicit_layout(
+    layout: Layout, printer_class: Type[Printer], expected_content: str, line_index: int
+) -> None:
+    printer = printer_class(title="unittest", layout=layout)
+    assert printer.lines[line_index].strip() == expected_content