test: add test files

test/.clang-format

@@ -0,0 +1,7 @@
+---
+Language: Cpp
+BasedOnStyle: Google
+BreakAfterAttributes: Leave
+CommentPragmas: '^ (IWYU pragma:|NOLINT(BEGIN|END|NEXTLINE)?(\(.+\))?:? )'
+DerivePointerAlignment: false
+InsertNewlineAtEOF: true

test/.clang-tidy

@@ -0,0 +1,87 @@
+---
+Checks: '
+  bugprone-*,
+  -bugprone-easily-swappable-parameters,
+  clang-analyzer-*,
+  clang-diagnostic-*,
+  cppcoreguidelines-*,
+  google-*,
+  -google-*googletest*,
+  hicpp-avoid-goto,
+  hicpp-exception-baseclass,
+  misc-header-include-cycle,
+  misc-static-assert,
+  misc-unused-alias-decls,
+  misc-unused-using-decls,
+  modernize-*,
+  performance-*,
+  readability-*,
+  -readability-qualified-auto,
+  -readability-static-accessed-through-instance'
+# AnalyzeTemporaryDtors: false
+FormatStyle: file
+HeaderFilterRegex: '.*'
+CheckOptions:
+  - key:   cppcoreguidelines-avoid-do-while.IgnoreMacros
+    value: true
+  - key:   cppcoreguidelines-narrowing-conversions.IgnoreConversionFromTypes
+    value: 'size_t;ptrdiff_t;size_type;difference_type'
+  - key:   readability-function-cognitive-complexity.IgnoreMacros
+    value: true
+  - key:   readability-identifier-length.MinimumVariableNameLength
+    value: 2
+  - key:   readability-identifier-length.MinimumParameterNameLength
+    value: 2
+# --- Google's naming convention BEGIN ---
+# modified part is marked as comment
+  - key:   readability-identifier-naming.ClassCase
+    value: CamelCase
+  - key:   readability-identifier-naming.ClassMemberCase
+    value: lower_case
+  - key:   readability-identifier-naming.ConstexprVariableCase
+    value: CamelCase
+  - key:   readability-identifier-naming.ConstexprVariablePrefix
+    value: k
+  - key:   readability-identifier-naming.EnumCase
+    value: CamelCase
+  - key:   readability-identifier-naming.EnumConstantCase
+    value: CamelCase
+  - key:   readability-identifier-naming.EnumConstantPrefix
+    value: k
+  - key:   readability-identifier-naming.FunctionCase
+    # value: CamelCase
+    value: lower_case
+  - key:   readability-identifier-naming.GlobalConstantCase
+    value: CamelCase
+  - key:   readability-identifier-naming.GlobalConstantPrefix
+    value: k
+  - key:   readability-identifier-naming.StaticConstantCase
+    value: CamelCase
+  - key:   readability-identifier-naming.StaticConstantPrefix
+    value: k
+  - key:   readability-identifier-naming.StaticVariableCase
+    value: lower_case
+  - key:   readability-identifier-naming.MacroDefinitionCase
+    value: UPPER_CASE
+  - key:   readability-identifier-naming.MacroDefinitionIgnoredRegexp
+    value: '^[A-Z]+(_[A-Z]+)*_$'
+  - key:   readability-identifier-naming.MemberCase
+    value: lower_case
+  - key:   readability-identifier-naming.PrivateMemberSuffix
+    value: _
+  - key:   readability-identifier-naming.PublicMemberSuffix
+    value: ''
+  - key:   readability-identifier-naming.NamespaceCase
+    value: lower_case
+  - key:   readability-identifier-naming.ParameterCase
+    value: lower_case
+  - key:   readability-identifier-naming.TypeAliasCase
+    value: CamelCase
+  - key:   readability-identifier-naming.TypedefCase
+    value: CamelCase
+  - key:   readability-identifier-naming.VariableCase
+    value: lower_case
+  - key:   readability-identifier-naming.IgnoreMainLikeFunctions
+    value: 1
+# --- Google's naming convention END   ---
+...

test/a.cpp

@@ -0,0 +1,4 @@
+class AA {
+ public:
+ public:
+};

test/b.cpp

@@ -0,0 +1,2 @@
+int 
+main() { int a; int b; c=1 }