tests: add StringUtils test

Author: LeoKle

src/tests/CMakeLists.txt

@@ -2,8 +2,10 @@ IF(BUILD_TESTING)
     FIND_PACKAGE(GTest REQUIRED)
 
     ADD_EXECUTABLE(tests
-        test_test.cpp
+        utils/test_StringUtils.cpp
+        test_main.cpp
     )
+    
     TARGET_LINK_LIBRARIES(tests PRIVATE
         vACDM 
         GTest::gtest_main

src/tests/test_main.cpp

@@ -0,0 +1,6 @@
+#include <gtest/gtest.h>
+
+int main(int argc, char **argv) {
+    ::testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}

src/tests/test_test.cpp

@@ -0,0 +1,41 @@
+#include <gtest/gtest.h>
+
+#include "utils/String.h"
+
+using namespace vacdm::utils;
+
+namespace utils::tests {
+TEST(StringUtilTest, Test_findIcao_base) {
+    // Test case: only ICAO code
+    EXPECT_EQ(String::findIcao("EDDK"), "EDDK");
+    EXPECT_EQ(String::findIcao("EDDF"), "EDDF");
+
+    // Test case: ICAO code not in uppercase
+    EXPECT_EQ(String::findIcao("eddk"), "");
+
+    // Test case: input is too short
+    EXPECT_EQ(String::findIcao("JFK"), "");
+
+    // Test case: no ICAO code in input
+    EXPECT_EQ(String::findIcao("This is a test"), "");
+
+    // Test case: empty string
+    EXPECT_EQ(String::findIcao(""), "");
+
+    // Test case: spaces before and after words
+    EXPECT_EQ(String::findIcao("  EDDK  "), "EDDK");
+    EXPECT_EQ(String::findIcao("  KLAX   "), "KLAX");
+}
+
+TEST(StringUtilTest, Test_findIcao_operators) {
+    /* tests the findIcao function based on airport names defined inside individual vACDM operators EuroScope packages*/
+
+    // most only use ICAOs
+    EXPECT_EQ(String::findIcao("EDDK"), "EDDK");
+    EXPECT_EQ(String::findIcao("LPPT"), "LPPT");
+
+    // some additionally include names
+    EXPECT_EQ(String::findIcao("EGLL London Heathrow"), "EGLL");
+    EXPECT_EQ(String::findIcao("EGKK London Gatwick"), "EGKK");
+}
+}  // namespace utils::tests