harden and speed up path op unit tests

tests/PathOpsDPointTest.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+#include "PathOpsTestCommon.h"
 #include "SkPathOpsPoint.h"
 #include "Test.h"
 
 static const SkDPoint tests[] = {
     {0, 0},
     {1, 0},
     {0, 1},
     {2, 1},
     {1, 2},
     {1, 1},
     {2, 2}
 };
 
 static const size_t tests_count = SK_ARRAY_COUNT(tests);
 
 static void PathOpsDPointTest(skiatest::Reporter* reporter) {
     for (size_t index = 0; index < tests_count; ++index) {
         const SkDPoint& pt = tests[index];
+        SkASSERT(ValidPoint(pt));
         SkDPoint p = pt;
         REPORTER_ASSERT(reporter, p == pt);
         REPORTER_ASSERT(reporter, !(pt != pt));
         SkDVector v = p - pt;
         p += v;
         REPORTER_ASSERT(reporter, p == pt);
         p -= v;
         REPORTER_ASSERT(reporter, p == pt);
         REPORTER_ASSERT(reporter, p.approximatelyEqual(pt));
         SkPoint sPt = pt.asSkPoint();
         p.set(sPt);
         REPORTER_ASSERT(reporter, p == pt);
         REPORTER_ASSERT(reporter, p.approximatelyEqual(sPt));
         REPORTER_ASSERT(reporter, p.roughlyEqual(pt));
         REPORTER_ASSERT(reporter, p.moreRoughlyEqual(pt));
         p.fX = p.fY = 0;
         REPORTER_ASSERT(reporter, p.fX == 0 && p.fY == 0);
         REPORTER_ASSERT(reporter, p.approximatelyZero());
         REPORTER_ASSERT(reporter, pt.distanceSquared(p) == pt.fX * pt.fX + pt.fY * pt.fY);
         REPORTER_ASSERT(reporter, approximately_equal(pt.distance(p),
                 sqrt(pt.fX * pt.fX + pt.fY * pt.fY)));
     }
 }
 
 #include "TestClassDef.h"
 DEFINE_TESTCLASS_SHORT(PathOpsDPointTest)