bug 955957 - pt 0 - add a simple unit test for gfxSkipChars functionality. r=roc

gfx/tests/gtest/TestSkipChars.cpp

@@ -0,0 +1,139 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+
+#include "gfxSkipChars.h"
+
+static bool
+TestConstructor()
+{
+  gfxSkipChars skipChars;
+
+  EXPECT_TRUE(skipChars.GetOriginalCharCount() == 0) <<
+    "[1] Make sure the gfxSkipChars was properly initialized with constructor";
+
+  return true;
+}
+
+static bool
+TestLength()
+{
+  gfxSkipCharsBuilder builder;
+
+  builder.KeepChars(100);
+
+  EXPECT_TRUE(builder.GetCharCount() == 100) <<
+    "[1] Check length after keeping chars";
+
+  builder.SkipChars(50);
+
+  EXPECT_TRUE(builder.GetCharCount() == 150) <<
+    "[2] Check length after skipping chars";
+
+  builder.SkipChars(50);
+
+  EXPECT_TRUE(builder.GetCharCount() == 200) <<
+    "[3] Check length after skipping more chars";
+
+  builder.KeepChar();
+
+  EXPECT_TRUE(builder.GetCharCount() == 201) <<
+    "[4] Check length after keeping a final char";
+
+  return true;
+}
+
+static bool
+TestIterator()
+{
+  // Test a gfxSkipChars that starts with kept chars
+  gfxSkipCharsBuilder builder1;
+
+  builder1.KeepChars(9);
+  builder1.SkipChar();
+  builder1.KeepChars(9);
+  builder1.SkipChar();
+  builder1.KeepChars(9);
+
+  gfxSkipChars skipChars;
+  skipChars.TakeFrom(&builder1);
+
+  EXPECT_TRUE(skipChars.GetOriginalCharCount() == 29) <<
+    "[1] Check length";
+
+  gfxSkipCharsIterator iter(skipChars);
+
+  EXPECT_TRUE(iter.GetOriginalOffset() == 0) <<
+    "[2] Check initial original offset";
+  EXPECT_TRUE(iter.GetSkippedOffset() == 0) <<
+    "[3] Check initial skipped offset";
+
+  uint32_t expectSkipped1[] =
+  {  0,  1,  2,  3,  4,  5,  6,  7,  8,  9,
+     9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+    18, 19, 20, 21, 22, 23, 24, 25, 26, 27 };
+
+  for (uint32_t i = 0; i < mozilla::ArrayLength(expectSkipped1); i++) {
+    EXPECT_TRUE(iter.ConvertOriginalToSkipped(i) == expectSkipped1[i]) <<
+      "[4] Check mapping of original to skipped for " << i;
+  }
+
+  uint32_t expectOriginal1[] =
+  {  0,  1,  2,  3,  4,  5,  6,  7,  8,
+    10, 11, 12, 13, 14, 15, 16, 17, 18,
+    20, 21, 22, 23, 24, 25, 26, 27, 28 };
+
+  for (uint32_t i = 0; i < mozilla::ArrayLength(expectOriginal1); i++) {
+    EXPECT_TRUE(iter.ConvertSkippedToOriginal(i) == expectOriginal1[i]) <<
+      "[5] Check mapping of skipped to original for " << i;
+  }
+
+  // Test a gfxSkipChars that starts with skipped chars
+  gfxSkipCharsBuilder builder2;
+
+  builder2.SkipChars(9);
+  builder2.KeepChar();
+  builder2.SkipChars(9);
+  builder2.KeepChar();
+  builder2.SkipChars(9);
+
+  skipChars.TakeFrom(&builder2);
+
+  EXPECT_TRUE(skipChars.GetOriginalCharCount() == 29) <<
+    "[6] Check length";
+
+  gfxSkipCharsIterator iter2(skipChars);
+
+  EXPECT_TRUE(iter2.GetOriginalOffset() == 0) <<
+    "[7] Check initial original offset";
+  EXPECT_TRUE(iter2.GetSkippedOffset() == 0) <<
+    "[8] Check initial skipped offset";
+
+  uint32_t expectSkipped2[] =
+  {  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+     1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
+     2,  2,  2,  2,  2,  2,  2,  2,  2,  2 };
+
+  for (uint32_t i = 0; i < mozilla::ArrayLength(expectSkipped2); i++) {
+    EXPECT_TRUE(iter2.ConvertOriginalToSkipped(i) == expectSkipped2[i]) <<
+      "[9] Check mapping of original to skipped for " << i;
+  }
+
+  uint32_t expectOriginal2[] = { 9, 19, 29 };
+
+  for (uint32_t i = 0; i < mozilla::ArrayLength(expectOriginal2); i++) {
+    EXPECT_TRUE(iter2.ConvertSkippedToOriginal(i) == expectOriginal2[i]) <<
+      "[10] Check mapping of skipped to original for " << i;
+  }
+
+  return true;
+}
+
+TEST(Gfx, gfxSkipChars) {
+  TestConstructor();
+  TestLength();
+  TestIterator();
+}

gfx/tests/gtest/moz.build

@@ -15,6 +15,7 @@ UNIFIED_SOURCES += [
     'TestColorNames.cpp',
     'TestLayers.cpp',
     'TestRegion.cpp',
+    'TestSkipChars.cpp',
     # Hangs on linux in ApplyGdkScreenFontOptions
     #'gfxFontSelectionTest.cpp',
     'TestTextures.cpp',