Added if else tests for parsing

tests/parser/if_else.cpp

@@ -0,0 +1,32 @@
+#include <gtest/gtest.h>
+
+#include "dragon/parser.h"
+#include "dragon/token.h"
+#include "dragon/lexer.h"
+
+struct IfElseTestParam {
+    std::string code;   
+    std::string to_string_result;
+};
+
+class IfElseTests : public ::testing::TestWithParam<IfElseTestParam> {};
+
+TEST_P(IfElseTests, HandlesIfElse) {
+    IfElseTestParam param = GetParam();
+
+    Parser parser(Lexer(param.code).lex());
+    auto nodes = parser.parse();
+
+    EXPECT_EQ(nodes[0].to_string(), param.to_string_result) << "Expected " << param.to_string_result << ", got " << nodes[0].to_string();
+}
+
+INSTANTIATE_TEST_SUITE_P(
+    IfElseVariations,
+    IfElseTests,
+    ::testing::Values(
+        IfElseTestParam{"if true { print(5) }", "IfElseNode"},
+        IfElseTestParam{"if true==true { print(5) } else { print(10) }", "IfElseNode"},
+        IfElseTestParam{"if true { print(5) } else if false { print(10) }", "IfElseNode"},
+        IfElseTestParam{"if true { print(5) } else if false { print(10) } else { print(15) }", "IfElseNode"}
+    )
+);