diff --git a/README.rst b/README.rst
index 8ec204a..39f3beb 100644
--- a/README.rst
+++ b/README.rst
@@ -1,13 +1,13 @@
 |ScreenShot|
 
 pyGameMath |Build Status| |Code Health| |Codacy Badge|
-======================================================
+====================================================
 
 | This is a math library written in python for 2D/3D game development
   which is also compatible with pypy. I made it while I was learning
   more about the math used in graphics development and for personal use
   in OpenGL related projects.
-| It’s still a work in progress.
+| It’s still a work in progress. Test cases edit.
 
 Dependencies:
 -------------
@@ -137,4 +137,4 @@ Legendre Polynomial (Experimental, not complete):
 .. |Code Health| image:: https://landscape.io/github/explosiveduck/pyGameMath/master/landscape.svg?style=flat
    :target: https://landscape.io/github/explosiveduck/pyGameMath/master
 .. |Codacy Badge| image:: https://api.codacy.com/project/badge/907e4230379f40a8bedcfc0a9a0ed43c
-   :target: https://www.codacy.com
\ No newline at end of file
+   :target: https://www.codacy.com
diff --git a/gem/vector.py b/gem/vector.py
index cdfea44..c22c0cb 100644
--- a/gem/vector.py
+++ b/gem/vector.py
@@ -111,7 +111,7 @@ def magnitude(size, vecA):
 def normalize(size, vecA):
     length = magnitude(size, vecA)
     temp = zero_vector(size)
-    if length is not 0:
+    if length != 0:
         for i in sm.range(size):
             temp[i] = vecA[i] / length
     return temp
diff --git a/test.py b/test.py
new file mode 100644
index 0000000..c4cc58c
--- /dev/null
+++ b/test.py
@@ -0,0 +1,57 @@
+import pytest
+import math
+from gem import matrix
+
+
+
+
+
+
+def test_fun():
+    b=[[0.0, 0.0, 0.0, 0.0, 0.0],
+    [0.0, 0.0, 0.0, 0.0, 0.0],
+    [0.0, 0.0, 0.0, 0.0, 0.0],
+    [0.0, 0.0, 0.0, 0.0, 0.0],
+    [0.0, 0.0, 0.0, 0.0, 0.0]]
+    assert matrix.zero_matrix(5)==b
+def test_fun1():
+    a=[[0.0, 0.0, 0.0],
+    [0.0, 0.0, 0.0],
+    [0.0, 0.0, 0.0]]
+    assert matrix.zero_matrix(3)==a  
+def test_fun2():
+    a=[[0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0],
+ [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0],
+ [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0],
+ [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0],
+ [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0],
+ [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0],
+ [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]]
+    assert matrix.zero_matrix(7)==a   
+
+
+
+
+def test_fun3():
+    b=[[1.0, 0.0, 0.0, 0.0, 0.0],
+ [0.0, 1.0, 0.0, 0.0, 0.0],
+ [0.0, 0.0, 1.0, 0.0, 0.0],
+ [0.0, 0.0, 0.0, 1.0, 0.0],
+ [0.0, 0.0, 0.0, 0.0, 1.0]]
+    assert matrix.identity(5)==b
+def test_fun4():
+    b=[[1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 1.0]]
+    assert matrix.identity(3)==b
+def test_fun5():
+    b=[[1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0],
+ [0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0],
+ [0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0],
+ [0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0],
+ [0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0],
+ [0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0],
+ [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0]]
+    assert matrix.identity(7)==b
+
+
+
+
diff --git a/test_noman.py b/test_noman.py
new file mode 100644
index 0000000..100a9f0
--- /dev/null
+++ b/test_noman.py
@@ -0,0 +1,48 @@
+import pytest
+from gem import matrix
+
+
+
+
+def test_function():
+    b=[[1.0, 0.0, 0.0, 0.0, 0.0],
+ [0.0, 1.0, 0.0, 0.0, 0.0],
+ [0.0, 0.0, 1.0, 0.0, 0.0],
+ [0.0, 0.0, 0.0, 1.0, 0.0],
+ [0.0, 0.0, 0.0, 0.0, 1.0]]
+    a=matrix.identity(5)
+    
+    assert matrix.transpose(a)==b
+def test_function1():
+    b=[[1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 1.0]]
+    a=matrix.identity(3)
+    
+    assert matrix.transpose(a)==b
+def test_function2():
+    b=[[1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0],
+ [0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0],
+ [0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0],
+ [0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0],
+ [0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0],
+ [0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0],
+ [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0]]
+    a=matrix.identity(7)
+    
+    assert matrix.transpose(a)==b
+
+
+
+
+
+def test_function3():
+  
+    a=matrix.identity(3)
+    
+    assert matrix.inverse3(a)==a
+def test_function5():
+   
+    a=matrix.identity(4)
+    
+    assert matrix.inverse4(a)==a
+
+    
\ No newline at end of file