diff --git a/test/src/test_common.c b/test/src/test_common.c
index 7afd42f..f4e0449 100644
--- a/test/src/test_common.c
+++ b/test/src/test_common.c
@@ -10,12 +10,20 @@ void
 test_rand_mat4(mat4 dest) {
   int i, j;
 
+  glm_mat4_copy(GLM_MAT4_IDENTITY, dest);
+  
   srand((unsigned int)time(NULL));
-  for (i = 0; i < 4; i++) {
-    for (j = 0; j < 4; j++) {
-      dest[i][j] = drand48();
-    }
-  }
+
+  /* random position */
+  dest[3][0] = drand48();
+  dest[3][0] = drand48();
+  dest[3][0] = drand48();
+  
+  /* random rotatation around random axis with random angle */
+  glm_rotate(dest, drand48(), (vec3){drand48(), drand48(), drand48()});
+  
+  /* random scale */
+  glm_scale(dest, (vec3){drand48(), drand48(), drand48()});
 }
 
 void
@@ -27,7 +35,7 @@ test_assert_mat4_eq(mat4 m1, mat4 m2) {
   for (i = 0; i < m; i++) {
     for (j = 0; j < n; j++) {
       for (k = 0; k < m; k++)
-        assert_true(fabsf(m1[i][j] - m2[i][j]) <= 0.0001);
+        assert_true(fabsf(m1[i][j] - m2[i][j]) <= FLT_EPSILON);
     }
   }
 #undef m