diff --git a/tests/03_matrix.cpp b/tests/03_matrix.cpp
index 1e3c32e..60096f1 100644
--- a/tests/03_matrix.cpp
+++ b/tests/03_matrix.cpp
@@ -305,8 +305,41 @@ TEST_CASE("[Matrix] Calculating a cofactor of a 3x3 matrix", "[Matrix]")
         {6, -1,  5}
     };
 
-    REQUIRE(a.minor(0, 0) == -12.0);
-    REQUIRE(a.cofactor(0, 0) == -12.0);
-    REQUIRE(a.minor(1, 0) == 25.0);
-    REQUIRE(a.cofactor(1, 0) == -25.0);
+    REQUIRE(a.minor(0, 0) == -12);
+    REQUIRE(a.cofactor(0, 0) == -12);
+    REQUIRE(a.minor(1, 0) == 25);
+    REQUIRE(a.cofactor(1, 0) == -25);
+}
+
+/* ------------------------------------------------------------------------- */
+
+TEST_CASE("[Matrix] Calculating the determinant of a 3x3 matrix", "[Matrix]")
+{
+    Matrix a = {
+        { 1, 2,  6},
+        {-5, 8, -4},
+        { 2, 6,  4}
+    };
+
+    REQUIRE(a.cofactor(0, 0) == 56);
+    REQUIRE(a.cofactor(0, 1) == 12);
+    REQUIRE(a.cofactor(0, 2) == -46);
+    REQUIRE(a.determinant() == -196);
+}
+
+/* ------------------------------------------------------------------------- */
+
+TEST_CASE("[Matrix] Calculating the determinant of a 4x4 matrix", "[Matrix]")
+{
+    Matrix a = {
+        {-2, -8, 3,  5},
+        {-3,  1, 7,  3},
+        {-6,  7, 7, -9}
+    };
+
+    REQUIRE(a.cofactor(0, 0) == 690);
+    REQUIRE(a.cofactor(0, 1) == 447);
+    REQUIRE(a.cofactor(0, 2) == 210);
+    REQUIRE(a.cofactor(0, 3) == 51);
+    REQUIRE(a.determinant() == -4071);
 }