improvement of buildTransform function's coverage

Tests/test_imagecms.py

@@ -698,3 +698,38 @@ def test_deprecation() -> None:
         assert ImageCms.VERSION == "1.0.0 pil"
     with pytest.warns(DeprecationWarning):
         assert isinstance(ImageCms.FLAGS, dict)
+
+def test_buildTransform_flags_non_integer():
+    with pytest.raises(ImageCms.PyCMSError):
+        ImageCms.buildTransform(
+            inputProfile="path/to/input/profile",
+            outputProfile="path/to/output/profile",
+            inMode="RGB",
+            outMode="CMYK",
+            renderingIntent=ImageCms.Intent.PERCEPTUAL,
+            flags="not_an_integer"
+        )
+
+def test_buildTransform_flags_out_of_range():
+    with pytest.raises(ImageCms.PyCMSError):
+        ImageCms.buildTransform(
+            inputProfile="path/to/input/profile",
+            outputProfile="path/to/output/profile",
+            inMode="RGB",
+            outMode="CMYK",
+            renderingIntent=ImageCms.Intent.PERCEPTUAL,
+            flags=999999
+        )
+
+def test_renderingIntent_non_integer():
+    with pytest.raises(ImageCms.PyCMSError) as exc_info:
+        ImageCms.buildTransform(
+            inputProfile="path/to/input/profile",
+            outputProfile="path/to/output/profile",
+            inMode="RGB",
+            outMode="CMYK",
+            renderingIntent="not an integer",
+            flags=0
+        )
+    assert str(exc_info.value) == "renderingIntent must be an integer between 0 and 3"
+