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Tests for object finalization semantics, as outlined in PEP 442.
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The base class for all the objects under test, equipped with various
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zNonGCSimpleBase._cleanupc c s^ t �� �L | j�� | j�� dt_zdV | jr<| jd �W ddt_| �� X W dQ R X dS )zI
A context manager to use around all finalization tests.
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disable_gcr r r r � _cleaningr r )r r r r �test. s
zNonGCSimpleBase.testc C s dS )z8
Check the object is sane (non-broken).
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C s^ y*| j s(| j�t| �� | �� | �� W n. tk
rX } z| j�|� W dd}~X Y nX dS )z�
PEP 442 finalizer. Record that this was called, check the
object is in a sane state, and invoke a side effect.
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A side effect called on destruction.
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r r r+ r r r r r r) X s r) c @ s e Zd ZdZdS )�NonGCr N)r
r r r% r r r r r- a s r- c @ s e Zd ZdZdd� ZdS )�NonGCResurrectorr c C s | j �| � dS )zF
Resurrect self by storing self in a class-wide list.
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r r r% r r r r r r. d s r. c @ s e Zd ZdS )�SimpleN)r
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d� Z dS )�TestBasec C s" t jd d � | _g t jd d �< d S )N)r r � old_garbage)r r r r �setUpv s zTestBase.setUpc C s& z| � tjg � W d | `t�� X d S )N)� assertEqualr r r2 r )r r r r �tearDownz s zTestBase.tearDownc C s | � ttj�t|�� d S )N)r4 �sortedr) r )r �idsr r r �assert_del_calls� s zTestBase.assert_del_callsc C s | � ttj�t|�� d S )N)r4 r6 r) r )r r7 r r r �assert_tp_del_calls� s z TestBase.assert_tp_del_callsc C s$ | � tdd� tjD ��t|�� d S )Nc s s | ]}t |�V qd S )N)r )�.0�xr r r � <genexpr>� s z,TestBase.assert_survivors.<locals>.<genexpr>)r4 r6 r) r )r r7 r r r �assert_survivors� s zTestBase.assert_survivorsc C s$ | � tdd� tjD ��t|�� d S )Nc s s | ]}t |�V qd S )N)r )r: r; r r r r< � s z*TestBase.assert_garbage.<locals>.<genexpr>)r4 r6 r r )r r7 r r r �assert_garbage� s zTestBase.assert_garbagec C s t j�� d S )N)r) r r )r r r r �clear_survivors� s zTestBase.clear_survivorsN)
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r r r3 r5 r8 r9 r= r> r? r r r r r1 t s r1 c @ s0 e Zd ZdZdd� Zdd� Zdd� Zdd � Zd
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Test finalization without refcycles.
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|� d � t�� | �|� | � g � W d Q R X d S )N) r) r r/ r �weakref�refr r r8 r= �assertIs)r �sr7 �wrr r r � test_simple� s
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z"SimpleFinalizationTest.test_non_gcc C s~ t �� �l t� }| �t�|�� t|�g}~t�� | �|� | � |� | �
� t�� | �|d � | � |� W d Q R X d S )N� ) r) r r. rI r rJ r r r8 r= r? )r rD r7 r r r �test_non_gc_resurrect� s
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r r r r r r rS � s rS c @ s e Zd Zdd� ZdS )�SuicidalSelfCyclec C s
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Explicitly break the reference cycle.
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r r r r r r r rT � s rT c @ s( e Zd ZdZdd� Zdd� Zdd� ZdS ) �SelfCycleFinalizationTestzX
Test finalization of an object having a single cyclic reference to
itself.
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|� d � t�� | �|� | � g � W d Q R X d S )N) r) r rR r rA rB r r r8 r= rC )r rD r7 rE r r r rF � s
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z-SelfCycleFinalizationTest.test_simple_suicideN)r
r r r$ rF rH rV r r r r rU � s rU c s$ e Zd Zdd� Z� fdd�Z� ZS )� ChainedBasec C s d| _ || _| |_d S )NF)�suicided�left�right)r rY r r r �chain& s zChainedBase.chainc s� t � �� | jr.| jd ks t�| jd ks�t�nT| j}|jrJ|jd ksXt�n|j| ksXt�| j}|jrt|jd ks�t�n|j| ks�t�d S )N)rO r rX rY r, rZ )r rY rZ )rP r r r + s
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r r r r r r r] ? s r] c @ s e Zd Zdd� ZdS )�SuicidalChainedc C s d| _ d| _d| _dS )z7
Explicitly break the reference cycle.
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r r r r r r r r^ B s r^ c @ sh e Zd ZdZdd� Zdd� Zdd� Zdd � Zd
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Test finalization of a cyclic chain. These tests are similar in
spirit to the self-cycle tests above, but the collectable object
graph isn't trivial anymore.
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<listcomp>U s z:CycleChainFinalizationTest.build_chain.<locals>.<listcomp>� )�range�lenr[ )r �classes�nodes�ir r r � build_chainT s z&CycleChainFinalizationTest.build_chainc C s� t |�}t�� �x | �|�}dd� |D �}dd� |D �}~t�� | �|� | �g � | �dd� |D �d g| � t�� | �|� W d Q R X d S )Nc S s g | ] }t |��qS r )r )r: rD r r r r` ^ s zKCycleChainFinalizationTest.check_non_resurrecting_chain.<locals>.<listcomp>c S s g | ]}t �|��qS r )rA rB )r: rD r r r r` _ s c S s g | ]
}|� �qS r r )r: rE r r r r` d s ) rc r) r rg r r r8 r= r4 )r rd �Nre r7 �wrsr r r � check_non_resurrecting_chainZ s
z7CycleChainFinalizationTest.check_non_resurrecting_chainc C s� t |�}t�� �� | �|�}t |�}dd� |D �}dd� |D �}dd� |D �}~t�� | �|� | �|� | �dd� |D �d g| � | � � t�� | �|� | �g � W d Q R X d S )Nc S s g | ] }t |��qS r )r )r: rD r r r r` m s zGCycleChainFinalizationTest.check_resurrecting_chain.<locals>.<listcomp>c S s g | ]}t |t�rt|��qS r )�
isinstancer0 r )r: rD r r r r` n s c S s g | ]}t �|��qS r )rA rB )r: rD r r r r` o s c S s g | ]
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rc r) r rg r r r8 r= r4 r? )r rd rh re r7 Z survivor_idsri r r r �check_resurrecting_chainh s
z3CycleChainFinalizationTest.check_resurrecting_chainc C s | � tgd � d S )N� )rj r\ )r r r r �test_homogenous{ s z*CycleChainFinalizationTest.test_homogenousc C s | � tgd � d S )Nrm )rl r] )r r r r �test_homogenous_resurrect~ s z4CycleChainFinalizationTest.test_homogenous_resurrectc C s | � tgd � d S )Nrm )rj r^ )r r r r �test_homogenous_suicidal� s z3CycleChainFinalizationTest.test_homogenous_suicidalc C s | � ttgd � d S )NrL )rj r^ r\ )r r r r � test_heterogenous_suicidal_one� s z9CycleChainFinalizationTest.test_heterogenous_suicidal_onec C s | � tgd tgd � d S )NrL )rj r^ r\ )r r r r � test_heterogenous_suicidal_two� s z9CycleChainFinalizationTest.test_heterogenous_suicidal_twoc C s | � ttgd � d S )NrL )rl r] r\ )r r r r � test_heterogenous_resurrect_one� s z:CycleChainFinalizationTest.test_heterogenous_resurrect_onec C s | � tttgd � d S )NrL )rl r] r\ r^ )r r r r � test_heterogenous_resurrect_two� s z:CycleChainFinalizationTest.test_heterogenous_resurrect_twoc C s( | � tgd tgd tgd � d S )NrL )rl r] r\ r^ )r r r r �!test_heterogenous_resurrect_three� s z<CycleChainFinalizationTest.test_heterogenous_resurrect_threeN)r
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rP } z| j�|� W d d }~X Y nX d S )N)r r r r r r! r )r r" r r r r# � s zLegacyBase.__del__c
C s^ y*| j s(| j�t| �� | �� | �� W n. tk
rX } z| j�|� W dd}~X Y nX dS )zJ
Legacy (pre-PEP 442) finalizer, mapped to a tp_del slot.
N)r r r r r r r! r )r r" r r r �
__tp_del__� s zLegacyBase.__tp_del__N)r
r r r# rw r r r r rv � s
rv c @ s e Zd ZdS )�LegacyN)r
r r r r r r rx � s rx c @ s e Zd Zdd� ZdS )�LegacyResurrectorc C s | j �| � dS )zF
Resurrect self by storing self in a class-wide list.
N)r r )r r r r r � s z LegacyResurrector.side_effectN)r
r r r r r r r ry � s ry c @ s e Zd ZdS )�LegacySelfCycleN)r
r r r r r r rz � s rz c s8 e Zd ZdZ� fdd�Zdd� Zdd� Zdd � Z� ZS )
�LegacyFinalizationTestz5
Test finalization of objects with a tp_del.
c s t j�� t �� t� �� d S )N)r r r r rO r5 )r )rP r r r5 � s
z LegacyFinalizationTest.tearDownc C s� t �� �r t� }t|�g}t�|�}~t�� | �|� | � |� | �
g � | � |� d � t�� | �|� | � |� W d Q R X d S )N) r) r rx r rA rB r r r8 r9 r= rC )r rD r7 rE r r r � test_legacy� s
z"LegacyFinalizationTest.test_legacyc C s� t �� �� t� }t|�g}t�|�}~t�� | �|� | � |� | �
|� | � |� d � | � � t�� | �|� | � |d � | �
|� W d Q R X | � |� d � d S )NrL )
r) r ry r rA rB r r r8 r9 r= rC r? )r rD r7 rE r r r �test_legacy_resurrect� s
z,LegacyFinalizationTest.test_legacy_resurrectc C s� t �� �l t� }t|�g}t�|�}~t�� | �g � | � g � | �
g � | � |� | � |� d � d tj
d _W d Q R X | � g � | �|� d � d S )Nr )r) r rz r rA rB r r r8 r9 r= r> rG r rC )r rD r7 rE r r r �test_legacy_self_cycle� s
z-LegacyFinalizationTest.test_legacy_self_cycle) r
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r{ �__main__)%r$ r' r ZunittestrA Z _testcapir � ImportErrorr r r r) r- r. r/ r0 r1 ZTestCaser@ rN rR rS rT rU rW r\ r] r^ r_ rv rx ry rz Z cpython_onlyr{ r
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