Merge IWYU from core

test/core/parsertests.cpp

@@ -1,8 +1,15 @@
-#include "parsertests.h"
-#include "handlermacros.h"
-#include "yaml-cpp/yaml.h"
 #include <iostream>
 
+#include "handlermacros.h"
+#include "parsertests.h"  // IWYU pragma: keep
+#include "teststruct.h"
+#include "yaml-cpp/parser.h"
+
+namespace YAML {
+class Exception;
+class ParserException;
+}  // namespace YAML
+
 namespace Test {
 namespace Parser {
 TEST NoEndOfMapFlow() {

test/core/spectests.cpp

@@ -1,9 +1,10 @@
-#include "spectests.h"
-#include "handlermacros.h"
-#include "specexamples.h"
-#include "yaml-cpp/yaml.h"
 #include <cassert>
 
+#include "handlermacros.h"
+#include "specexamples.h"  // IWYU pragma: keep
+#include "spectests.h"  // IWYU pragma: keep
+#include "yaml-cpp/yaml.h"  // IWYU pragma: keep
+
 namespace Test {
 namespace Spec {
 // 2.1

test/emittertests.cpp

@@ -1,8 +1,9 @@
-#include "tests.h"
-#include "handlermacros.h"
-#include "yaml-cpp/yaml.h"
 #include <iostream>
 
+#include "teststruct.h"
+#include "yaml-cpp/eventhandler.h"
+#include "yaml-cpp/yaml.h"  // IWYU pragma: keep
+
 namespace Test {
 namespace Emitter {
 ////////////////////////////////////////////////////////////////////////////////////////////////////////

test/ostream_wrapper_test.cpp

@@ -1,8 +1,8 @@
-#include "yaml-cpp/ostream_wrapper.h"
-
+#include <stddef.h>
 #include <sstream>
 
 #include "gtest/gtest.h"
+#include "yaml-cpp/ostream_wrapper.h"
 
 namespace {
 TEST(OstreamWrapperTest, BufferNoWrite) {

test/spectests.cpp

@@ -1,7 +1,12 @@
-#include "spectests.h"
-#include "yaml-cpp/yaml.h"
 #include <iostream>
 
+#include "spectests.h"
+#include "yaml-cpp/yaml.h"  // IWYU pragma: keep
+
+namespace YAML {
+class Exception;
+}  // namespace YAML
+
 namespace Test {
 namespace {
 void RunSpecTest(TEST (*test)(), const std::string& index,

test/tests.cpp

@@ -1,13 +1,13 @@
-#include "tests.h"
+#include <fstream>
+#include <iostream>
+#include <sstream>
+#include <vector>
+
 #include "emittertests.h"
 #include "nodetests.h"
 #include "parsertests.h"
 #include "spectests.h"
-#include "yaml-cpp/yaml.h"
-#include <fstream>
-#include <sstream>
-#include <vector>
-#include <iostream>
+#include "tests.h"
 
 namespace Test {
 void RunAll() {