add test for --report argument and features.pilinfo(supported_formats)

Tests/test_features.py

@@ -117,9 +117,10 @@ def test_unsupported_module() -> None:
         features.version_module(module)
 
 
-def test_pilinfo() -> None:
+@pytest.mark.parametrize("supported_formats", (True, False))
+def test_pilinfo(supported_formats) -> None:
     buf = io.StringIO()
-    features.pilinfo(buf)
+    features.pilinfo(buf, supported_formats=supported_formats)
     out = buf.getvalue()
     lines = out.splitlines()
     assert lines[0] == "-" * 68
@@ -148,4 +149,4 @@ def test_pilinfo() -> None:
         + "-" * 68
         + "\n"
     )
-    assert jpeg in out
+    assert supported_formats == (jpeg in out)

Tests/test_main.py

@@ -4,9 +4,15 @@ import os
 import subprocess
 import sys
 
+import pytest
 
-def test_main() -> None:
-    out = subprocess.check_output([sys.executable, "-m", "PIL"]).decode("utf-8")
+
+@pytest.mark.parametrize("report", (False, True))
+def test_main(report) -> None:
+    args = [sys.executable, "-m", "PIL"]
+    if report:
+        args.append("--report")
+    out = subprocess.check_output(args).decode("utf-8")
     lines = out.splitlines()
     assert lines[0] == "-" * 68
     assert lines[1].startswith("Pillow ")
@@ -37,4 +43,4 @@ def test_main() -> None:
         + "-" * 68
         + os.linesep
     )
-    assert jpeg in out
+    assert report == (jpeg not in out)