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DRAFT change distance tests to use unittest #280

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DRAFT change distance tests to use unittest #280

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36 changes: 29 additions & 7 deletions pretext/Functions/ProgramDevelopment.ptx
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Original file line number Diff line number Diff line change
Expand Up @@ -31,11 +31,17 @@ def distance(x1, y1, x2, y2):
<p>We import the test module to enable us to write a unit test for the function.</p>
<program xml:id="ch06_distance1" interactive="activecode" language="python">
<code>
import test
import unittest

def distance(x1, y1, x2, y2):
return 0.0

test.testEqual(distance(1, 2, 1, 2), 0)
class TestDistance(unittest.TestCase):
def test_distance(self):
self.assertEqual(distance(1, 2, 1, 2), 0)

x = TestDistance('test_distance'))
x.run()
</code>
</program>
<p>The <c>testEqual</c> function from the test module calls the distance function with sample inputs: (1,2, 1,2).
Expand Down Expand Up @@ -85,17 +91,33 @@ def distance(x1, y1, x2, y2):
we compute and return the result.</p>
<program xml:id="ch06_distancefinal" interactive="activecode" language="python">
<code>
import test
import unittest

def distance(x1, y1, x2, y2):
dx = x2 - x1
dy = y2 - y1
dsquared = dx**2 + dy**2
result = dsquared**0.5
return result

test.testEqual(distance(1,2, 1,2), 0)
test.testEqual(distance(1,2, 4,6), 5)
test.testEqual(distance(0,0, 1,1), 1.41)
class TestDistance(unittest.TestCase):
def test_distance_zero(self):
self.assertEqual(distance(1,2, 1,2), 0)

def test_distance_five(self):
self.assertEqual(distance(1,2, 4,6), 5)

def test_distance_square(self):
self.assertEqual(distance(0,0, 1,1), 1.41)

x = TestDistance('test_distance_zero')
x.run()

x = TestDistance('test_distance_five')
x.run()

x = TestDistance('test_distance_square')
x.run()
</code>
</program>
<note>
Expand All @@ -117,7 +139,7 @@ test.testEqual(distance(0,0, 1,1), 1.41)
<p>Copy line 11 on to line 12. On line 12, change <c>1.41421</c> to <c>1.41</c>. Run. The test fails.</p>
</li>
<li>
<p>Type <c>, 2</c> after 1.41. (The 2 represents the precision of the test &#x2013; how many digits to the right of the decimal that must be correct.) Run.</p>
<p>Change the line to <c>self.assertAlmostEqual(distance(0,0, 1,1), 1.41, places=2)</c>. (The <c>assertAlmostequal</c> and <c>places=2</c> represent the precision of the test &#x2013; how many digits to the right of the decimal that must be correct.) Run.</p>
</li>
</ul>
</p>
Expand Down