Temp (#123)

* Coverage

* added fixes

* removed spacing

* removed junk

* removed print

* removed coverage

* removed useless stuff

* fix

---------

Co-authored-by: Saikari <lin@sz.cn.eu.org>

tests/general/unit_test_mat_coverage_extra.cpp

@@ -0,0 +1,24 @@
+// Added to exercise Mat initializer-list exception branches and determinant fallback
+#include <gtest/gtest.h>
+#include <omath/linear_algebra/mat.hpp>
+
+using namespace omath;
+
+TEST(MatCoverageExtra, InitListRowsMismatchThrows) {
+    // Rows mismatch: provide 3 rows for a 2x2 Mat
+    EXPECT_THROW((Mat<2,2>{ {1,2}, {3,4}, {5,6} }), std::invalid_argument);
+}
+
+TEST(MatCoverageExtra, InitListColumnsMismatchThrows) {
+    // Columns mismatch: second row has wrong number of columns
+    EXPECT_THROW((Mat<2,2>{ {1,2}, {3} }), std::invalid_argument);
+}
+
+TEST(MatCoverageExtra, DeterminantFallbackIsCallable) {
+    // Call determinant for 1x1 and 2x2 matrices to cover determinant paths
+    Mat<1,1> m1{{3.14f}};
+    EXPECT_FLOAT_EQ(m1.determinant(), 3.14f);
+
+    Mat<2,2> m2{{{1.0f,2.0f},{3.0f,4.0f}}};
+    EXPECT_FLOAT_EQ(m2.determinant(), -2.0f);
+}