fixing InteractiveShell instantiation in test

IPython/extensions/tests/test_rmagic.py

@@ -1,43 +1,41 b''
 import numpy as np
 from IPython.core.interactiveshell import InteractiveShell
 from IPython.extensions import rmagic
 
-ip = None
-def setup():
-    global ip
-    ip = InteractiveShell()
-    ip.magic('load_ext rmagic')
+ip = get_ipython()
+ip.magic('load_ext rmagic')
+
 
 def test_push():
     rm = rmagic.RMagics(ip)
     ip.push({'X':np.arange(5), 'Y':np.array([3,5,4,6,7])})
     ip.run_line_magic('Rpush', 'X Y')
     np.testing.assert_almost_equal(np.asarray(rm.r('X')), ip.user_ns['X'])
     np.testing.assert_almost_equal(np.asarray(rm.r('Y')), ip.user_ns['Y'])
 
 def test_pull():
     rm = rmagic.RMagics(ip)
     rm.r('Z=c(11:20)')
     ip.run_line_magic('Rpull', 'Z')
     np.testing.assert_almost_equal(np.asarray(rm.r('Z')), ip.user_ns['Z'])
     np.testing.assert_almost_equal(ip.user_ns['Z'], np.arange(11,21))
 
 # def test_inline():
 #     rm = rmagic.RMagics(ip)
 #     c = ip.run_line_magic('Rinline', 'lm(Y~X)$coef')
 #     np.testing.assert_almost_equal(c, [3.2, 0.9])
 
 def test_cell_magic():
 
     ip.push({'x':np.arange(5), 'y':np.array([3,5,4,6,7])})
     snippet = '''
     print(summary(a))
     plot(X, Y, pch=23, bg='orange', cex=2)
     plot(Y, X)
     print(summary(X))
     r = resid(a)
     xc = coef(a)
     '''
     ip.run_cell_magic('R', '-i x,y -o r,xc a=lm(y~x)', snippet)
     np.testing.assert_almost_equal(ip.user_ns['xc'], [3.2, 0.9])
     np.testing.assert_almost_equal(ip.user_ns['r'], np.array([-0.2,  0.9, -1. ,  0.1,  0.2]))