harden and speed up path op unit tests

tests/PathOpsCubicLineIntersectionTest.cpp

Index: tests/PathOpsCubicLineIntersectionTest.cpp
diff --git a/tests/PathOpsCubicLineIntersectionTest.cpp b/tests/PathOpsCubicLineIntersectionTest.cpp
index 245f8a667450c6bc02a5260c4ca2a6838f9730d2..2f52b3b1f214311a8e0a5c9b9affccfb1b4c1d57 100644
--- a/tests/PathOpsCubicLineIntersectionTest.cpp
+++ b/tests/PathOpsCubicLineIntersectionTest.cpp
@@ -4,6 +4,7 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+#include "PathOpsTestCommon.h"
 #include "SkIntersections.h"
 #include "SkPathOpsCubic.h"
 #include "SkPathOpsLine.h"
@@ -32,7 +33,9 @@ static const size_t lineCubicTests_count = SK_ARRAY_COUNT(lineCubicTests);
 
 static void testOne(skiatest::Reporter* reporter, int iIndex) {
     const SkDCubic& cubic = lineCubicTests[iIndex].cubic;
+    SkASSERT(ValidCubic(cubic));
     const SkDLine& line = lineCubicTests[iIndex].line;
+    SkASSERT(ValidLine(line));
     SkReduceOrder reduce1;
     SkReduceOrder reduce2;
     int order1 = reduce1.reduce(cubic, SkReduceOrder::kNo_Quadratics,