Unittest assertion failure after the console print "assertion failure" problem-CodePudding

My code:

 
The import unittest 
Import from DDT DDT, data 


@ DDT 
The class TestDdt (unittest. TestCase) : 
Def setUp (self) : 
Print (" setUp once before each test case execution ") 

Def tearDown (self) : 
Print (" tearDown after each test case execution is to perform a ") 

@ data (1, 2) 
Def test_single_element (self value) : 
"" "
Test a single set of element 
: return: 
"" "
Print (value) 
Value, self. AssertEqual (1) 


If __name__=="__main__ ': 
Unittest. The main ()

Results:

 setUp before each test case execution performs a 
1 
TearDown after each test case execution is executed a 
The setUp before each test case execution performs a 
2 
TearDown after each test case execution is executed a 


1!=2 

Expectations: 
 2Practice: 1 

Traceback (the most recent call last) : 
The File "F: \ PyCharm \ PyCharm Community Edition 2020.2 \ plugins \ python - ce, helpers, PyCharm \ teamcity \ diff_tools py", line 32, in _patched_equals 
Old (self, first, second, MSG) 
The File "C: \ Users \ LJX \ AppData \ Local \ designed \ Python \ Python38 \ lib \ unittest \ case py", line 912, in assertEqual 
Assertion_func (first, second, MSG=MSG) 
The File "C: \ Users \ LJX \ AppData \ Local \ designed \ Python \ Python38 \ lib \ unittest \ case py", line 905, in _baseAssertEqual 
Raise the self. FailureException (MSG) 
AssertionError: 2!=1 

During handling of the above exception, another exception occurred: 

Traceback (the most recent call last) : 
File "C: \ Users \ LJX \ AppData \ Local \ Python38 \ lib \ \ designed \ Python unittest \ case py", 60, the line in testPartExecutor 
Yield 
File "C: \ Users \ LJX \ AppData \ Local \ Python38 \ lib \ \ designed \ Python unittest \ case py", line 676, in the run 
Self. _callTestMethod (testMethod) 
The File "C: \ Users \ LJX \ AppData \ Local \ designed \ Python \ Python38 \ lib \ unittest \ case py", line 633, in _callTestMethod 
Method () 
The File "E: \ pythonProject_1 \ venv \ lib \ site - packages \ DDT. Py", line 182, wrapper in 
Return func (self, * args, * * kwargs) 
The File "E: \ pythonProject_1 \ Excel_operation \ for_ddt py", line 20, in test_single_element 
Value, self. AssertEqual (1) 



Ran 2 tests in 0.006 s 

FAILED (failures=1) 

Process is over, exit code 1 

Assertion failure 

Assertion failure 

Assertion failure

Here asserted a success, a failure, but why to print the assertions failed 3 times?