diff --git a/tests/test_rectilinear_grid.py b/tests/test_rectilinear_grid.py
index 5e4d74f..db7510e 100644
--- a/tests/test_rectilinear_grid.py
+++ b/tests/test_rectilinear_grid.py
@@ -1,22 +1,28 @@
 from uvw import RectilinearGrid, DataArray
 import numpy as np
 
 def test_rectilinear_grid():
-    N = 10
+    N = 3
 
     x = np.linspace(0, 1, N*2)
     y = np.linspace(0, 1, N+2)
     z = np.linspace(0, 1, N)
 
-    rect = RectilinearGrid('test.vtr', (x, y, z))
+    out_name = 'test_rectilinear_grid.vtr'
+    rect = RectilinearGrid(out_name, (x, y, z))
 
     x, y, z = np.meshgrid(x, y, z, indexing='ij')
     r = np.sqrt(x**2 + y**2 + z**2)
     e_r = np.zeros(r.shape + (3,3))
     e_r[0, 0, 0, :, :] = np.array([[0, 1, 0], [1, 0, 0], [0, 1, 1]])
     e_r[-1, 0, 0, :, :] = np.eye(3)
-    print(e_r.shape)
+
     rect.addPointData(DataArray(r, range(3), 'R'))
     rect.addPointData(DataArray(r, range(3), 'R2'))
     rect.addPointData(DataArray(e_r, range(3), 'e_r'))
     rect.write()
+
+    output = open(out_name, 'r')
+    reference = open('test_rectilinear_grid.ref', 'r')
+
+    assert output.read() == reference.read()
diff --git a/tests/test_rectilinear_grid.ref b/tests/test_rectilinear_grid.ref
new file mode 100644
index 0000000..966e98b
--- /dev/null
+++ b/tests/test_rectilinear_grid.ref
@@ -0,0 +1,19 @@
+<?xml version="1.0" ?>
+  <VTKFile byte_order="LittleEndian" type="RectilinearGrid" version="0.1">
+    <RectilinearGrid WholeExtent="0 5 0 4 0 2 ">
+      <Piece Extent="0 5 0 4 0 2 ">
+        <Coordinates>
+          <DataArray Name="x_coordinates" NumberOfComponents="1" format="binary" type="Float64">MAAAAA==AAAAAAAAAACamZmZmZnJP5qZmZmZmdk/NDMzMzMz4z+amZmZmZnpPwAAAAAAAPA/</DataArray>
+          <DataArray Name="y_coordinates" NumberOfComponents="1" format="binary" type="Float64">KAAAAA==AAAAAAAAAAAAAAAAAADQPwAAAAAAAOA/AAAAAAAA6D8AAAAAAADwPw==</DataArray>
+          <DataArray Name="z_coordinates" NumberOfComponents="1" format="binary" type="Float64">GAAAAA==AAAAAAAAAAAAAAAAAADgPwAAAAAAAPA/</DataArray>
+        </Coordinates>
+        <PointData>
+          <DataArray Name="R" NumberOfComponents="1" format="binary" type="Float64">0AIAAA==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</DataArray>
+          <DataArray Name="R2" NumberOfComponents="1" format="binary" type="Float64">0AIAAA==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</DataArray>
+          <DataArray Name="e_r" NumberOfComponents="9" format="binary" type="Float64">UBkAAA==AAAAAAAAAAAAAAAAAADwPwAAAAAAAAAAAAAAAAAA8D8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADwPwAAAAAAAPA/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA8D8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADwPwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAPA/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA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+        </PointData>
+        <CellData/>
+      </Piece>
+    </RectilinearGrid>
+    <AppendedData format="base64">_</AppendedData>
+  </VTKFile>
\ No newline at end of file