documentation: Writing Unit and Rendering Tests

site/dev/contrib/tests.md

Index: site/dev/contrib/tests.md
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+Writing Unit and Rendering Tests
+================================
+
+Writing a Unit Test
+-------------------
+
+1.  Add a file `tests/NewUnitTest.cpp`:
+
+    <!--?prettify lang=cc?-->
+
+        /*
+         * Copyright ........
+         *
+         * Use of this source code is governed by a BSD-style license
+         * that can be found in the LICENSE file.
+         */
+        #include "Test.h"
+        DEF_TEST(NewUnitTest, reporter) {
+            if (1 + 1 != 2) {
+                ERRORF(reporter, "%d + %d != %d", 1, 1, 2);
+            }
+            bool lifeIsGood = true;
+            REPORTER_ASSERT(reporter, lifeIsGood);
+        }
+
+2.  Add a line to `gyp/tests.gypi`:
+
+        '../tests/NewUnitTest.cpp',
+
+3.  Recompile and run test:
+
+        ./gyp_skia
+        ninja -C out/Debug dm
+        out/Debug/dm --match NewUnitTest
+
+Writing a Rendering Test
+------------------------
+
+1.  Add a file `gm/newgmtest.cpp`:
+
+    <!--?prettify lang=cc?-->
+
+        /*
+         * Copyright ........
+         *
+         * Use of this source code is governed by a BSD-style license
+         * that can be found in the LICENSE file.
+         */
+        #include "gm.h"
+        DEF_SIMPLE_GM(newgmtest, canvas, 128, 128) {
+            canvas->clear(SK_ColorWHITE);
+            SkPaint p;
+            p.setStrokeWidth(2);
+            canvas->drawLine(16, 16, 112, 112, p);
+        }
+
+2.  Add a line to `gyp/gmslides.gypi`:
+
+        '../gm/newgmtest.cpp',
+
+3.  Recompile and run test:
+
+        ./gyp_skia
+        ninja -C out/Debug dm
+        out/Debug/dm --match newgmtest