Add error message if test suite cannot be found (#3585)

* 🚸 add error message if test suite cannot be found

Fixes #3584

tests/src/make_test_data_available.hpp

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <cstdio>   // fopen, fclose, FILE
+#include <memory> // unique_ptr
+#include <test_data.hpp>
+#include <doctest.h>
+
+namespace utils
+{
+
+inline bool check_testsuite_downloaded()
+{
+    std::unique_ptr<std::FILE, decltype(&std::fclose)> file(std::fopen(TEST_DATA_DIRECTORY "/README.md", "r"), &std::fclose);
+    return file != nullptr;
+}
+
+TEST_CASE("check test suite is downloaded")
+{
+    REQUIRE_MESSAGE(utils::check_testsuite_downloaded(), "Test data not found in '" TEST_DATA_DIRECTORY "'. Please execute target 'download_test_data' before running this test suite. See <https://github.com/nlohmann/json#execute-unit-tests> for more information.");
+}
+
+}  // namespace utils

tests/src/unit-binary_formats.cpp

@@ -12,7 +12,7 @@
 using nlohmann::json;
 
 #include <fstream>
-#include <test_data.hpp>
+#include "make_test_data_available.hpp"
 
 TEST_CASE("Binary Formats" * doctest::skip())
 {

tests/src/unit-bjdata.cpp

@@ -16,7 +16,7 @@ using nlohmann::json;
 #include <iostream>
 #include <fstream>
 #include <set>
-#include <test_data.hpp>
+#include "make_test_data_available.hpp"
 #include "test_utils.hpp"
 
 namespace

tests/src/unit-bson.cpp

@@ -13,7 +13,7 @@ using nlohmann::json;
 
 #include <fstream>
 #include <sstream>
-#include <test_data.hpp>
+#include "make_test_data_available.hpp"
 #include "test_utils.hpp"
 
 TEST_CASE("BSON")

tests/src/unit-cbor.cpp

@@ -16,7 +16,7 @@ using nlohmann::json;
 #include <iomanip>
 #include <iostream>
 #include <set>
-#include <test_data.hpp>
+#include "make_test_data_available.hpp"
 #include "test_utils.hpp"
 
 namespace

tests/src/unit-inspection.cpp

@@ -13,7 +13,7 @@ using nlohmann::json;
 
 #include <fstream>
 #include <sstream>
-#include <test_data.hpp>
+#include "make_test_data_available.hpp"
 
 TEST_CASE("object inspection")
 {

tests/src/unit-json_patch.cpp

@@ -12,7 +12,7 @@
 using nlohmann::json;
 
 #include <fstream>
-#include <test_data.hpp>
+#include "make_test_data_available.hpp"
 
 TEST_CASE("JSON patch")
 {

tests/src/unit-msgpack.cpp

@@ -15,7 +15,7 @@ using nlohmann::json;
 #include <sstream>
 #include <iomanip>
 #include <set>
-#include <test_data.hpp>
+#include "make_test_data_available.hpp"
 #include "test_utils.hpp"
 
 namespace

tests/src/unit-regression1.cpp

@@ -19,7 +19,7 @@ using nlohmann::json;
 #include <sstream>
 #include <list>
 #include <cstdio>
-#include <test_data.hpp>
+#include "make_test_data_available.hpp"
 
 #ifdef JSON_HAS_CPP_17
     #include <variant>

tests/src/unit-testsuites.cpp

@@ -12,7 +12,7 @@
 using nlohmann::json;
 
 #include <fstream>
-#include <test_data.hpp>
+#include "make_test_data_available.hpp"
 
 TEST_CASE("compliance tests from json.org")
 {

tests/src/unit-ubjson.cpp

@@ -14,7 +14,7 @@ using nlohmann::json;
 #include <iostream>
 #include <fstream>
 #include <set>
-#include <test_data.hpp>
+#include "make_test_data_available.hpp"
 #include "test_utils.hpp"
 
 namespace

tests/src/unit-unicode1.cpp

@@ -16,7 +16,7 @@ using nlohmann::json;
 #include <fstream>
 #include <sstream>
 #include <iomanip>
-#include <test_data.hpp>
+#include "make_test_data_available.hpp"
 
 TEST_CASE("Unicode (1/5)" * doctest::skip())
 {

tests/src/unit-unicode2.cpp

@@ -18,7 +18,7 @@ using nlohmann::json;
 #include <sstream>
 #include <iostream>
 #include <iomanip>
-#include <test_data.hpp>
+#include "make_test_data_available.hpp"
 
 // this test suite uses static variables with non-trivial destructors
 DOCTEST_CLANG_SUPPRESS_WARNING_PUSH

tests/src/unit-unicode3.cpp

@@ -18,7 +18,7 @@ using nlohmann::json;
 #include <sstream>
 #include <iostream>
 #include <iomanip>
-#include <test_data.hpp>
+#include "make_test_data_available.hpp"
 
 // this test suite uses static variables with non-trivial destructors
 DOCTEST_CLANG_SUPPRESS_WARNING_PUSH

tests/src/unit-unicode4.cpp

@@ -18,7 +18,7 @@ using nlohmann::json;
 #include <sstream>
 #include <iostream>
 #include <iomanip>
-#include <test_data.hpp>
+#include "make_test_data_available.hpp"
 
 // this test suite uses static variables with non-trivial destructors
 DOCTEST_CLANG_SUPPRESS_WARNING_PUSH

tests/src/unit-unicode5.cpp

@@ -18,7 +18,7 @@ using nlohmann::json;
 #include <sstream>
 #include <iostream>
 #include <iomanip>
-#include <test_data.hpp>
+#include "make_test_data_available.hpp"
 
 // this test suite uses static variables with non-trivial destructors
 DOCTEST_CLANG_SUPPRESS_WARNING_PUSH