add calibration test

test/calibration_tests.py

+from tupak.gw import calibration
+import unittest
+import numpy as np
+
+
+class TestBaseClass(unittest.TestCase):
+
+    def setUp(self):
+        self.model = calibration.Recalibrate()
+
+    def tearDown(self):
+        del self.model
+
+    def test_calibration_factor(self):
+        frequency_array = np.linspace(20, 1024, 1000)
+        cal_factor = self.model.get_calibration_factor(frequency_array)
+        assert np.alltrue(cal_factor.real == np.ones_like(frequency_array))
+
+
+class TestCubicSpline(unittest.TestCase):
+
+    def setUp(self):
+        self.model = calibration.CubicSpline(
+            prefix='recalib_', minimum_frequency=20, maximum_frequency=1024,
+            n_points=5)
+        self.parameters = {'recalib_{}_{}'.format(param, ii): 0.0
+                           for ii in range(5)
+                           for param in ['amplitude', 'phase']}
+
+    def tearDown(self):
+        del self.model
+        del self.parameters
+
+    def test_calibration_factor(self):
+        frequency_array = np.linspace(20, 1024, 1000)
+        cal_factor = self.model.get_calibration_factor(frequency_array,
+                                                       **self.parameters)
+        assert np.alltrue(cal_factor.real == np.ones_like(frequency_array))
+
+
+class TestCubicSplineRequiresFourNodes(unittest.TestCase):
+
+    def test_cannot_instantiate_with_too_few_nodes(self):
+        self.assertRaises(ValueError,
+                          lambda: calibration.CubicSpline('test', 1, 10, 3))
+
+    def test_can_instantiate_with_four_few_nodes(self):
+        calibration.CubicSpline('test', 1, 10, 4)
+
+
+if __name__ == '__main__':
+    unittest.main()