O[U]StringBuffer::appendUninitialized unit tests

Change-Id: I55f0a5bd01a3e250764e1eb34d674b535b85b56f

sal/CppunitTest_sal_rtl_oustringbuffer.mk

@@ -11,6 +11,7 @@ $(eval $(call gb_CppunitTest_CppunitTest,sal_rtl_oustringbuffer))
 
 $(eval $(call gb_CppunitTest_add_exception_objects,sal_rtl_oustringbuffer,\
     sal/qa/rtl/oustringbuffer/test_oustringbuffer_appendchar \
+    sal/qa/rtl/oustringbuffer/test_oustringbuffer_appenduninitialized \
     sal/qa/rtl/oustringbuffer/test_oustringbuffer_noadditional \
     sal/qa/rtl/oustringbuffer/test_oustringbuffer_tostring \
     sal/qa/rtl/oustringbuffer/test_oustringbuffer_utf32 \

sal/qa/OStringBuffer/rtl_OStringBuffer.cxx

@@ -15967,6 +15967,50 @@ namespace rtl_OStringBuffer
         CPPUNIT_TEST( append_035 );
         CPPUNIT_TEST_SUITE_END();
     };
+
+    class AppendUninitialized: public CppUnit::TestFixture {
+    private:
+        void testEmpty();
+
+        void testNonEmpty();
+
+        void testZero();
+
+        CPPUNIT_TEST_SUITE(AppendUninitialized);
+        CPPUNIT_TEST(testEmpty);
+        CPPUNIT_TEST(testNonEmpty);
+        CPPUNIT_TEST(testZero);
+        CPPUNIT_TEST_SUITE_END();
+    };
+
+    void AppendUninitialized::testEmpty() {
+        OStringBuffer s;
+        CPPUNIT_ASSERT_EQUAL(sal_Int32(0), s.getLength());
+        char * p = s.appendUninitialized(5);
+        CPPUNIT_ASSERT_EQUAL(
+            static_cast<void const *>(s.getStr()),
+            static_cast<void const *>(p));
+        CPPUNIT_ASSERT_EQUAL(sal_Int32(5), s.getLength());
+    }
+
+    void AppendUninitialized::testNonEmpty() {
+        OStringBuffer s("ab");
+        CPPUNIT_ASSERT_EQUAL(sal_Int32(2), s.getLength());
+        char * p = s.appendUninitialized(5);
+        CPPUNIT_ASSERT_EQUAL(
+            static_cast<void const *>(s.getStr() + 2),
+            static_cast<void const *>(p));
+        CPPUNIT_ASSERT_EQUAL(sal_Int32(7), s.getLength());
+    }
+
+    void AppendUninitialized::testZero() {
+        OStringBuffer s;
+        char * p = s.appendUninitialized(0);
+        CPPUNIT_ASSERT_EQUAL(
+            static_cast<void const *>(s.getStr()),
+            static_cast<void const *>(p));
+        CPPUNIT_ASSERT_EQUAL(sal_Int32(0), s.getLength());
+    }
 } // namespace rtl_OStringBuffer
 
 CPPUNIT_TEST_SUITE_REGISTRATION(rtl_OStringBuffer::ctors);
@@ -15996,6 +16040,7 @@ CPPUNIT_TEST_SUITE_REGISTRATION(rtl_OStringBuffer::append_008_float);
 CPPUNIT_TEST_SUITE_REGISTRATION(rtl_OStringBuffer::append_008_Float_Negative);
 CPPUNIT_TEST_SUITE_REGISTRATION(rtl_OStringBuffer::append_009_double);
 CPPUNIT_TEST_SUITE_REGISTRATION(rtl_OStringBuffer::append_009_Double_Negative);
+CPPUNIT_TEST_SUITE_REGISTRATION(rtl_OStringBuffer::AppendUninitialized);
 CPPUNIT_TEST_SUITE_REGISTRATION(rtl_OStringBuffer::remove);
 
 CPPUNIT_PLUGIN_IMPLEMENT();

sal/qa/rtl/oustringbuffer/test_oustringbuffer_appenduninitialized.cxx

+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * 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 <sal/config.h>
+
+#include <cppunit/TestAssert.h>
+#include <cppunit/TestFixture.h>
+#include <cppunit/extensions/HelperMacros.h>
+#include <rtl/ustrbuf.hxx>
+#include <sal/types.h>
+
+namespace {
+
+class Test: public CppUnit::TestFixture {
+private:
+    void testEmpty();
+
+    void testNonEmpty();
+
+    void testZero();
+
+    CPPUNIT_TEST_SUITE(Test);
+    CPPUNIT_TEST(testEmpty);
+    CPPUNIT_TEST(testNonEmpty);
+    CPPUNIT_TEST(testZero);
+    CPPUNIT_TEST_SUITE_END();
+};
+
+void Test::testEmpty() {
+    OUStringBuffer s;
+    CPPUNIT_ASSERT_EQUAL(sal_Int32(0), s.getLength());
+    sal_Unicode * p = s.appendUninitialized(5);
+    CPPUNIT_ASSERT_EQUAL(
+        static_cast<void const *>(s.getStr()), static_cast<void const *>(p));
+    CPPUNIT_ASSERT_EQUAL(sal_Int32(5), s.getLength());
+}
+
+void Test::testNonEmpty() {
+    OUStringBuffer s("ab");
+    CPPUNIT_ASSERT_EQUAL(sal_Int32(2), s.getLength());
+    sal_Unicode * p = s.appendUninitialized(5);
+    CPPUNIT_ASSERT_EQUAL(
+        static_cast<void const *>(s.getStr() + 2),
+        static_cast<void const *>(p));
+    CPPUNIT_ASSERT_EQUAL(sal_Int32(7), s.getLength());
+}
+
+void Test::testZero() {
+    OUStringBuffer s;
+    sal_Unicode * p = s.appendUninitialized(0);
+    CPPUNIT_ASSERT_EQUAL(
+        static_cast<void const *>(s.getStr()), static_cast<void const *>(p));
+    CPPUNIT_ASSERT_EQUAL(sal_Int32(0), s.getLength());
+}
+
+CPPUNIT_TEST_SUITE_REGISTRATION(Test);
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */