Unit test for Line algorithm

TestMaxDepth test checks the linear (lin) algorithm such that it arranges
child layout nodes along a linear path.

Change-Id: Ibf6f654d2f68f31a1c1a0f57044b411add954fa0
Reviewed-on: https://gerrit.libreoffice.org/55080Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Jan Holesovsky <kendy@collabora.com>

sd/qa/unit/import-tests-smartart.cxx

@@ -165,6 +165,10 @@ void SdImportTestSmartArt::testMaxDepth()
     uno::Reference<text::XText> xText1(xShapeGroup->getByIndex(1), uno::UNO_QUERY_THROW);
     CPPUNIT_ASSERT_EQUAL(OUString("second"), xText1->getString());
 
+    uno::Reference<drawing::XShape> xShape0(xShapeGroup->getByIndex(0), uno::UNO_QUERY_THROW);
+    uno::Reference<drawing::XShape> xShape1(xShapeGroup->getByIndex(1), uno::UNO_QUERY_THROW);
+    CPPUNIT_ASSERT_EQUAL(xShape0->getPosition().Y , xShape1->getPosition().Y); // Confirms shapes are in same Y axis-level.
+
     xDocShRef->DoClose();
 }