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_more.cpp

@@ -0,0 +1,21 @@
+// Unit tests to exercise Mat extra branches
+#include "gtest/gtest.h"
+#include "omath/linear_algebra/mat.hpp"
+
+using omath::Mat;
+
+TEST(MatMore, InitListAndMultiply)
+{
+    Mat<3,3,float> m{{{1.f,2.f,3.f}, {0.f,1.f,4.f}, {5.f,6.f,0.f}}};
+    // multiply by scalar and check element
+    auto r = m * 1.f;
+    EXPECT_EQ(r.at(0,0), m.at(0,0));
+    EXPECT_EQ(r.at(1,2), m.at(1,2));
+}
+
+TEST(MatMore, Determinant)
+{
+    Mat<2,2,double> m{{{1.0,2.0},{2.0,4.0}}}; // singular
+    double det = m.determinant();
+    EXPECT_DOUBLE_EQ(det, 0.0);
+}