Adding tempfile helper

tests/HelpersTest.cpp

@@ -1,10 +1,5 @@
-#ifdef CLI_SINGLE_FILE
+#include "app_helper.hpp"
-#include "CLI11.hpp"
-#else
-#include "CLI/CLI.hpp"
-#endif
 
-#include "gtest/gtest.h"
 #include <cstdio>
 #include <fstream>
 
@@ -50,6 +45,31 @@ TEST(Validators, FileNotExists) {
     EXPECT_TRUE(CLI::NonexistentPath(myfile));
 }
 
+// Yes, this is testing an app_helper :)
+TEST(AppHelper, TempfileCreated) {
+    std::string name = "TestFileNotUsed.txt";
+    {
+    TempFile myfile{name};
+
+    EXPECT_FALSE(CLI::ExistingFile(myfile));
+    
+    bool ok = static_cast<bool>(std::ofstream(myfile.c_str()).put('a')); // create file
+    EXPECT_TRUE(ok);
+    EXPECT_TRUE(CLI::ExistingFile(name));
+    }
+    EXPECT_FALSE(CLI::ExistingFile(name));
+}
+
+TEST(AppHelper, TempfileNotCreated) {
+    std::string name = "TestFileNotUsed.txt";
+    {
+    TempFile myfile{name};
+
+    EXPECT_FALSE(CLI::ExistingFile(myfile));
+    }
+    EXPECT_FALSE(CLI::ExistingFile(name));
+}
+
 TEST(Split, StringList) {
 
     std::vector<std::string> results {"a", "long", "--lone", "-q"};

tests/IniTest.cpp

@@ -1,10 +1,4 @@
-#ifdef CLI_SINGLE_FILE
+#include "app_helper.hpp"
-#include "CLI11.hpp"
-#else
-#include "CLI/CLI.hpp"
-#endif
-
-#include "gtest/gtest.h"
 
 #include <cstdio>
 #include <sstream>

tests/app_helper.hpp

@@ -24,4 +24,21 @@ struct TApp : public ::testing::Test {
 };
 
 
+class TempFile {
+    std::string _name;
 
+public:
+
+    TempFile(std::string name) : _name(name) {
+        if(!CLI::NonexistentPath(_name))
+            throw std::runtime_error(_name);
+
+    }
+
+    ~TempFile() {
+        std::remove(_name.c_str()); // Doesn't matter if returns 0 or not
+    }
+
+    operator const std::string& () const {return _name;}
+    const char * c_str() const {return _name.c_str();}
+};