More testing.

test/matrixAssignment.cpp

@@ -26,7 +26,30 @@ int main()
     Matrix3f m2(data);
     m2.print();
 
+    for(int i=0; i<9; i++) {
+        assert(fabs(data[i] - m2.data()[i]) < 1e-6f);
+    }
+
+    float data_times_2[9] = {2, 4, 6, 8, 10, 12, 14, 16, 18};
+    Matrix3f m3(data_times_2);
+
     assert(m == m2);
+    assert(!(m == m3));
+
+    m2 *= 2;
+    assert(m2 == m3);
+
+    m2 /= 2;
+    m2 -= 1;
+    float data_minus_1[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
+    assert(Matrix3f(data_minus_1) == m2);
+
+    m2 += 1;
+    assert(Matrix3f(data) == m2);
+
+    m3 -= m2;
+
+    assert(m3 == m2);
 
     return 0;
 }