diff --git a/test/airthmetic.cpp b/test/arithmetic.cpp
similarity index 100%
rename from test/airthmetic.cpp
rename to test/arithmetic.cpp
diff --git a/test/functions.cpp b/test/functions.cpp
index 3342589..5c42735 100644
--- a/test/functions.cpp
+++ b/test/functions.cpp
@@ -30,29 +30,73 @@ int main() {
     );
 
     _TEST_ASSERT(
-        _TEST_NO_EXCEPTION(holds_alternative<monostate>(execute("double a(int b, double c, int d) { return b+c+d; };"))),
+        _TEST_NO_EXCEPTION(holds_alternative<monostate>(execute(R"(
+            double a(int b, double c, int d) {
+                return b+c+d;
+            }
+            )"))),
         "Déclaration de fonction",
         true
     );
 
     _TEST_ASSERT(
-        _TEST_IS_EXCEPTION(execute("int a(int b) { int c(int d) {return d;} return c(b); };"), ErrorType::NestedFunction),
+        _TEST_IS_EXCEPTION(execute(R"(
+                int a(int b) {
+                    int c(int d) {
+                        return d;
+                    }
+                    return c(b);
+                };
+                )"),
+                ErrorType::NestedFunction
+            ),
         "Fonctions imbriquées",
         true
     );
 
 
     _TEST_ASSERT(
-        _TEST_NO_EXCEPTION(get<int>(execute("int sum(int a, int b) {return a+b;}; sum(20, 7);")) == 27),
+        _TEST_NO_EXCEPTION(get<int>(execute(R"(
+            int sum(int a, int b) {
+                return a+b;
+            }
+            sum(20, 7);
+            )")) == 27),
         "Exécution de fonction",
         true
     );
 
     _TEST_ASSERT(
-        _TEST_NO_EXCEPTION(get<int>(execute("int recurse(int a) {if (a < 27) {return recurse(a+1);} else {return a;}}; recurse(0);")) == 27),
+        _TEST_NO_EXCEPTION(get<int>(execute(R"(
+            int recurse(int a) {
+                if (a < 27)
+                    return recurse(a+1);
+                else
+                    return a;
+            };
+            recurse(0);
+            )")) == 27),
         "Fonction récursive",
         true
     );
 
+    _TEST_ASSERT(
+        _TEST_NO_EXCEPTION(get<int>(execute(R"(
+            int x(int a);
+            int y(int a) {
+                return x(a);
+            }
+            int x(int a) {
+                if (a < 75) {
+                    return y(a+1);
+                }
+                return a;
+            }
+            x(0);
+            )")) == 75),
+        "Fonctions mutuellement récursives",
+        true
+    );
+
     return 0;
 }
\ No newline at end of file