add hasInclude tests

Author: ludviggunne

test/testpreprocessor.cpp

@@ -292,6 +292,8 @@ class TestPreprocessor : public TestFixture {
         TEST_CASE(testMissingIncludeMixed);
         TEST_CASE(testMissingIncludeCheckConfig);
 
+        TEST_CASE(hasInclude);
+
         TEST_CASE(limitsDefines);
 
         TEST_CASE(hashCalculation);
@@ -2567,6 +2569,23 @@ class TestPreprocessor : public TestFixture {
                       "test.c:11:0: information: Include file: <" + missing4 + "> not found. Please note: Cppcheck does not need standard library headers to get proper results. [missingIncludeSystem]\n", errout_str());
     }
 
+    void hasInclude() {
+        const char code[] = "#if __has_include(<directory/non-existent-header.h>)\n123\n#endif";
+        Settings settings;
+
+        settings.standards.setStd("c++11");
+        ASSERT_EQUALS("", PreprocessorHelper::getcode(settings, *this, code, "", "test.cpp"));
+        ASSERT_EQUALS("[test.cpp:1:0]: (error) failed to evaluate #if condition, division/modulo by zero [preprocessorErrorDirective]\n", errout_str());
+
+        settings.standards.setStd("c++17");
+        ASSERT_EQUALS("", PreprocessorHelper::getcode(settings, *this, code, "", "test.cpp"));
+        ASSERT_EQUALS("", errout_str());
+
+        settings.standards.setStd("gnu++11");
+        ASSERT_EQUALS("", PreprocessorHelper::getcode(settings, *this, code, "", "test.cpp"));
+        ASSERT_EQUALS("", errout_str());
+    }
+
     void limitsDefines() {
         // #11928 / #10045
         const char code[] = "void f(long l) {\n"