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--- cs:fundamental:cs61a:week_1 [2023/09/26 04:36] – [Local Assignment] codinghare
+++ cs:fundamental:cs61a:week_1 [2023/09/26 09:47] – [Testing] codinghare
@@ 行 300: / 行 300: @@
 </code>
 ===Testing===
+==Assertions==
+python 中可以使用 ''assert'' statement 做验证。如果 ''assert'' 返回的对象为 ''True''，那么什么也不会发生。否则，错误会被抛出：
+<code py>
+>>> def fib_test():
+        assert fib(2) == 1, 'The 2nd Fibonacci number should be 1'
+        assert fib(3) == 1, 'The 3rd Fibonacci number should be 1'
+        assert fib(50) == 7778742049, 'Error at the 50th Fibonacci number'
+</code>
+==Doctest==
+//docstring// 中可以包含 test case，用于测试：
+<code py>
+>>> def sum_naturals(n):
+        """Return the sum of the first n natural numbers.
+        >>> sum_naturals(10)
+        >>> sum_naturals(100)
+        """
+        total, k = 0, 1
+        while k <= n:
+            total, k = total + k, k + 1
+        return total
+>>> from doctest import testmod
+>>> testmod()
+TestResults(failed=0, attempted=2)
+</code>

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