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| 1 /* |
| 2 * Copyright 2013 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #include "SkTDStackNester.h" |
| 9 |
| 10 #include "Test.h" |
| 11 #include "TestClassDef.h" |
| 12 |
| 13 /** |
| 14 * Test SkTDStackNester<int>::push(). Pushes the current count onto the stack, |
| 15 * and checks that the count has increased by one. |
| 16 */ |
| 17 static void test_push(skiatest::Reporter* reporter, SkTDStackNester<int>* nester
) { |
| 18 SkASSERT(nester); |
| 19 const int count = nester->count(); |
| 20 // test_pop depends on this value. |
| 21 nester->push(count); |
| 22 REPORTER_ASSERT(reporter, nester->count() == count + 1); |
| 23 } |
| 24 |
| 25 /** |
| 26 * Test SkTDStackNester<int>::pop(). Pops the top element off the stack, and |
| 27 * checks that the new count is one smaller, and that the popped element |
| 28 * matches the new count (as was pushed by test_push). |
| 29 */ |
| 30 static void test_pop(skiatest::Reporter* reporter, SkTDStackNester<int>* nester)
{ |
| 31 SkASSERT(nester); |
| 32 const int count = nester->count(); |
| 33 // This test should not be called with a count <= 0. |
| 34 SkASSERT(count > 0); |
| 35 const int top = nester->top(); |
| 36 int value = -1; |
| 37 nester->pop(&value); |
| 38 REPORTER_ASSERT(reporter, top == value); |
| 39 const int newCount = nester->count(); |
| 40 REPORTER_ASSERT(reporter, newCount == count - 1); |
| 41 // Since test_push always pushes the count prior to the push, value should |
| 42 // always be one less than count. |
| 43 REPORTER_ASSERT(reporter, newCount == value); |
| 44 } |
| 45 |
| 46 /** |
| 47 * Test nest() and unnest(). nest() is called, and it is confirmed that the |
| 48 * count is now zero. Then test_push() is called inc times, followed by a call
to |
| 49 * unnest(). After this call, check that the count has returned to the initial
count, and |
| 50 * that nestingLevel() has returned to its initial value. |
| 51 */ |
| 52 static void test_nest(skiatest::Reporter* reporter, SkTDStackNester<int>* nester
, int inc) { |
| 53 SkASSERT(nester); |
| 54 SkASSERT(inc > 0); |
| 55 const int initialCount = nester->count(); |
| 56 const int initialNesting = nester->nestingLevel(); |
| 57 |
| 58 nester->nest(); |
| 59 REPORTER_ASSERT(reporter, nester->count() == 0); |
| 60 REPORTER_ASSERT(reporter, nester->nestingLevel() == initialNesting + 1); |
| 61 |
| 62 for (int i = 0; i < inc; ++i) { |
| 63 test_push(reporter, nester); |
| 64 } |
| 65 |
| 66 nester->unnest(); |
| 67 REPORTER_ASSERT(reporter, nester->count() == initialCount); |
| 68 REPORTER_ASSERT(reporter, nester->nestingLevel() == initialNesting); |
| 69 } |
| 70 |
| 71 class SkTDStackNesterTester { |
| 72 public: |
| 73 static int GetSlotCount() { |
| 74 return SkTDStackNester<int>::kSlotCount; |
| 75 } |
| 76 }; |
| 77 |
| 78 static void test_stack_nester(skiatest::Reporter* reporter) { |
| 79 SkTDStackNester<int> nester; |
| 80 int count = nester.count(); |
| 81 REPORTER_ASSERT(reporter, 0 == count); |
| 82 REPORTER_ASSERT(reporter, nester.nestingLevel() == 0); |
| 83 REPORTER_ASSERT(reporter, nester.empty()); |
| 84 |
| 85 // Test nesting (with arbitrary number of pushes) from the beginning. |
| 86 test_nest(reporter, &nester, 3); |
| 87 |
| 88 const int slotCount = SkTDStackNesterTester::GetSlotCount(); |
| 89 |
| 90 // Test pushing beyond the boundary of the first Rec. |
| 91 for (; count < 2 * slotCount; ++count) { |
| 92 if (3 == count) { |
| 93 // Test nesting (an arbitrary number of pushes) early on. |
| 94 test_nest(reporter, &nester, 7); |
| 95 } else if (slotCount - 4 == count) { |
| 96 // Test nesting across the boundary of a Rec. |
| 97 test_nest(reporter, &nester, 6); |
| 98 } |
| 99 test_push(reporter, &nester); |
| 100 } |
| 101 |
| 102 // Pop everything off the stack except for the last one, to confirm |
| 103 // that the destructor handles a remaining object. |
| 104 while (nester.count() > 1) { |
| 105 test_pop(reporter, &nester); |
| 106 } |
| 107 } |
| 108 |
| 109 DEF_TEST(TDStackNester, reporter) { |
| 110 test_stack_nester(reporter); |
| 111 } |
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