1 files changed, 53 insertions, 0 deletions
diff --git a/tests/pyreverse/test_printer.py b/tests/pyreverse/test_printer.py
new file mode 100644
index 000000000..e2b72b22c
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+++ b/tests/pyreverse/test_printer.py
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+# Copyright (c) 2021 Daniël van Noord <13665637+DanielNoord@users.noreply.github.com>
+# 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/main/LICENSE
+
+from typing import Type
+
+import pytest
+
+from pylint.pyreverse.dot_printer import DotPrinter
+from pylint.pyreverse.plantuml_printer import PlantUmlPrinter
+from pylint.pyreverse.printer import Layout, NodeType, 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),
+        (Layout.TOP_TO_BOTTOM, PlantUmlPrinter, "top to bottom direction", -1),
+        (Layout.LEFT_TO_RIGHT, PlantUmlPrinter, "left to right direction", -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
+
+
+@pytest.mark.parametrize(
+    "layout, printer_class",
+    [(Layout.BOTTOM_TO_TOP, PlantUmlPrinter), (Layout.RIGHT_TO_LEFT, PlantUmlPrinter)],
+)
+def test_unsupported_layout(layout: Layout, printer_class: Type[Printer]):
+    with pytest.raises(ValueError):
+        printer_class(title="unittest", layout=layout)
+
+
+class TestPlantUmlPrinter:
+    printer = PlantUmlPrinter(title="unittest", layout=Layout.TOP_TO_BOTTOM)
+
+    def test_node_without_properties(self) -> None:
+        self.printer.emit_node(name="test", type_=NodeType.CLASS)
+        assert self.printer.lines[-2:] == ['class "test" as test {\n', "}\n"]