Add reg test for http://crbug.com/348821

BUG=348821
R=reed@google.com, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/189373008

git-svn-id: http://skia.googlecode.com/svn/trunk@13852 2bbb7eff-a529-9590-31e7-b0007b416f81

2 files changed, 22 insertions, 0 deletions

diff --git a/gyp/tests.gypi b/gyp/tests.gypi
index cd0e111626..a036dbd4d8 100644
--- a/gyp/tests.gypi
+++ b/gyp/tests.gypi
@@ -55,6 +55,7 @@
     '../tests/ColorFilterTest.cpp',
     '../tests/ColorPrivTest.cpp',
     '../tests/ColorTest.cpp',
+    '../tests/DashPathEffectTest.cpp',
     '../tests/DataRefTest.cpp',
     '../tests/DeferredCanvasTest.cpp',
     '../tests/DequeTest.cpp',
diff --git a/tests/DashPathEffectTest.cpp b/tests/DashPathEffectTest.cpp
new file mode 100644
index 0000000000..1e53058de8
--- /dev/null
+++ b/tests/DashPathEffectTest.cpp
@@ -0,0 +1,21 @@
+#include "Test.h"
+
+#include "SkDashPathEffect.h"
+#include "SkWriteBuffer.h"
+
+// crbug.com/348821 was rooted in SkDashPathEffect refusing to flatten and unflatten itself when
+// fInitialDashLength < 0 (a signal the effect is nonsense).  Here we test that it flattens.
+
+DEF_TEST(DashPathEffectTest_crbug_348821, r) {
+    SkScalar intervals[] = { 1.76934361e+36f, 2.80259693e-45f };  // Values from bug.
+    const int count = 2;
+    SkScalar phase = SK_ScalarInfinity;  // Used to force the bad fInitialDashLength = -1 path.
+    SkAutoTUnref<SkDashPathEffect> dash(SkDashPathEffect::Create(intervals, count, phase));
+
+    // NULL -> refuses to work with flattening framework.
+    REPORTER_ASSERT(r, dash->getFactory() != NULL);
+
+    SkWriteBuffer buffer;
+    buffer.writeFlattenable(dash);
+    REPORTER_ASSERT(r, buffer.bytesWritten() > 12);  // We'd write 12 if broken, >=40 if not.
+}