Add MinidumpContextWriter test

minidump/minidump_context_writer_test.cc

Index: minidump/minidump_context_writer_test.cc
diff --git a/minidump/minidump_context_writer_test.cc b/minidump/minidump_context_writer_test.cc
new file mode 100644
index 0000000000000000000000000000000000000000..559b2e3f72d74e8ea941ecafc5be1a3b7036a378
--- /dev/null
+++ b/minidump/minidump_context_writer_test.cc
@@ -0,0 +1,102 @@
+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "minidump/minidump_context_writer.h"
+
+#include <stdint.h>
+
+#include "gtest/gtest.h"
+#include "minidump/minidump_context.h"
+#include "minidump/minidump_context_test_util.h"
+#include "util/file/string_file_writer.h"
+
+namespace crashpad {
+namespace test {
+namespace {
+
+TEST(MinidumpContextWriter, MinidumpContextX86Writer) {
+  StringFileWriter file_writer;
+
+  {
+    // Make sure that a context writer that’s untouched writes a zeroed-out
+    // context.
+    SCOPED_TRACE("zero");
+
+    MinidumpContextX86Writer context_writer;
+
+    EXPECT_TRUE(context_writer.WriteEverything(&file_writer));
+    ASSERT_EQ(sizeof(MinidumpContextX86), file_writer.string().size());
+
+    const MinidumpContextX86* observed =
+        reinterpret_cast<const MinidumpContextX86*>(&file_writer.string()[0]);
+    ExpectMinidumpContextX86(0, observed);
+  }
+
+  {
+    SCOPED_TRACE("nonzero");
+
+    file_writer.Reset();
+    const uint32_t kSeed = 0x8086;
+
+    MinidumpContextX86Writer context_writer;
+    InitializeMinidumpContextX86(context_writer.context(), kSeed);
+
+    EXPECT_TRUE(context_writer.WriteEverything(&file_writer));
+    ASSERT_EQ(sizeof(MinidumpContextX86), file_writer.string().size());
+
+    const MinidumpContextX86* observed =
+        reinterpret_cast<const MinidumpContextX86*>(&file_writer.string()[0]);
+    ExpectMinidumpContextX86(kSeed, observed);
+  }
+}
+
+TEST(MinidumpContextWriter, MinidumpContextAMD64Writer) {
+  StringFileWriter file_writer;
+
+  {
+    // Make sure that a context writer that’s untouched writes a zeroed-out
+    // context.
+    SCOPED_TRACE("zero");
+
+    MinidumpContextAMD64Writer context_writer;
+
+    EXPECT_TRUE(context_writer.WriteEverything(&file_writer));
+    ASSERT_EQ(sizeof(MinidumpContextAMD64), file_writer.string().size());
+
+    const MinidumpContextAMD64* observed =
+        reinterpret_cast<const MinidumpContextAMD64*>(&file_writer.string()[0]);
+    ExpectMinidumpContextAMD64(0, observed);
+  }
+
+  {
+    SCOPED_TRACE("nonzero");
+
+    file_writer.Reset();
+    const uint32_t kSeed = 0x808664;
+
+    MinidumpContextAMD64Writer context_writer;
+    InitializeMinidumpContextAMD64(context_writer.context(), kSeed);
+
+    EXPECT_TRUE(context_writer.WriteEverything(&file_writer));
+    ASSERT_EQ(sizeof(MinidumpContextAMD64), file_writer.string().size());
+
+    const MinidumpContextAMD64* observed =
+        reinterpret_cast<const MinidumpContextAMD64*>(&file_writer.string()[0]);
+    ExpectMinidumpContextAMD64(kSeed, observed);
+  }
+}
+
+}  // namespace
+}  // namespace test
+}  // namespace crashpad