fix typo

mgovers · mgovers · commit bc6188376778 · 2025-10-08T08:51:32.000+02:00
Signed-off-by: Martijn Govers &lt;Martijn.Govers@Alliander.com&gt;
diff --git a/tests/cpp_unit_tests/test_iterator_facade.cpp b/tests/cpp_unit_tests/test_iterator_facade.cpp
@@ -38,7 +38,7 @@ template <typename UnderlyingType> class BaseTestIterator : public IteratorFacad
         return *this;
     }
     friend constexpr auto operator-(BaseTestIterator const& first, BaseTestIterator const& second) -> difference_type {
-        return second.it_ - first.it_;
+        return first.it_ - second.it_;
     }
 
   private:
@@ -92,6 +92,8 @@ TEST_CASE_TEMPLATE("Test IteratorFacade", T, TestIdxVectorIterator, TestIdxVecto
         auto const it4 = TestIterator{vec.begin() + 15};
         dist = it2 - it4;
         CHECK(dist == 10);
+        dist = it4 - it2;
+        CHECK(dist == -10);
     }
     if constexpr (std::is_same_v<TestIterator, TestIdxVectorIterator>) {
         SUBCASE("Mutate elements") {

Original file line number	Diff line number	Diff line change
`@@ -38,7 +38,7 @@ template <typename UnderlyingType> class BaseTestIterator : public IteratorFacad`
`38`	`38`	`return *this;`
`39`	`39`	`}`
`40`	`40`	`friend constexpr auto operator-(BaseTestIterator const& first, BaseTestIterator const& second) -> difference_type {`
`41`		`- return second.it_ - first.it_;`
	`41`	`+ return first.it_ - second.it_;`
`42`	`42`	`}`
`43`	`43`
`44`	`44`	`private:`
`@@ -92,6 +92,8 @@ TEST_CASE_TEMPLATE("Test IteratorFacade", T, TestIdxVectorIterator, TestIdxVecto`
`92`	`92`	`auto const it4 = TestIterator{vec.begin() + 15};`
`93`	`93`	`dist = it2 - it4;`
`94`	`94`	`CHECK(dist == 10);`
	`95`	`+ dist = it4 - it2;`
	`96`	`+ CHECK(dist == -10);`
`95`	`97`	`}`
`96`	`98`	`if constexpr (std::is_same_v<TestIterator, TestIdxVectorIterator>) {`
`97`	`99`	`SUBCASE("Mutate elements") {`