Remove the special case for TinyMatrix<1> output for consistency

It has now the same behavior as TinyVector

src/algebra/TinyMatrix.hpp

@@ -121,9 +121,6 @@ class [[nodiscard]] TinyMatrix
   PUGS_INLINE
   constexpr friend std::ostream& operator<<(std::ostream& os, const TinyMatrix& A)
   {
-    if constexpr (N == 1) {
-      os << A(0, 0);
-    } else {
     os << '[';
     for (size_t i = 0; i < N; ++i) {
       os << '(' << A(i, 0);
@@ -133,7 +130,7 @@ class [[nodiscard]] TinyMatrix
       os << ')';
     }
     os << ']';
-    }
+
     return os;
   }
 

tests/test_TinyMatrix.cpp

@@ -220,7 +220,7 @@ TEST_CASE("TinyMatrix", "[algebra]")
   SECTION("checking for matrices output")
   {
     REQUIRE(Catch::Detail::stringify(A) == "[(1,2,3)(4,5,6)(7,8,9)]");
-    REQUIRE(Catch::Detail::stringify(TinyMatrix<1, int>(7)) == "7");
+    REQUIRE(Catch::Detail::stringify(TinyMatrix<1, int>(7)) == "[(7)]");
   }
 
 #ifndef NDEBUG