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    45. 

  45.   <h1>Source code for flask.testing</h1><div class="highlight"><pre>
    46. 

  46. <span></span><span class="c1"># -*- coding: utf-8 -*-</span>
    47. 

  47. <span class="sd">&quot;&quot;&quot;</span>
    48. 

  48. <span class="sd">    flask.testing</span>
    49. 

  49. <span class="sd">    ~~~~~~~~~~~~~</span>
    50. 

  50. 

  51. <span class="sd">    Implements test support helpers.  This module is lazily imported</span>
    52. 

  52. <span class="sd">    and usually not used in production environments.</span>
    53. 

  53. 

  54. <span class="sd">    :copyright: (c) 2015 by Armin Ronacher.</span>
    55. 

  55. <span class="sd">    :license: BSD, see LICENSE for more details.</span>
    56. 

  56. <span class="sd">&quot;&quot;&quot;</span>
    57. 

  57. 

  58. <span class="kn">from</span> <span class="nn">contextlib</span> <span class="k">import</span> <span class="n">contextmanager</span>
    59. 

  59. <span class="kn">from</span> <span class="nn">werkzeug.test</span> <span class="k">import</span> <span class="n">Client</span><span class="p">,</span> <span class="n">EnvironBuilder</span>
    60. 

  60. <span class="kn">from</span> <span class="nn">flask</span> <span class="k">import</span> <span class="n">_request_ctx_stack</span>
    61. 

  61. 

  62. <span class="k">try</span><span class="p">:</span>
    63. 

  63.     <span class="kn">from</span> <span class="nn">werkzeug.urls</span> <span class="k">import</span> <span class="n">url_parse</span>
    64. 

  64. <span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
    65. 

  65.     <span class="kn">from</span> <span class="nn">urlparse</span> <span class="k">import</span> <span class="n">urlsplit</span> <span class="k">as</span> <span class="n">url_parse</span>
    66. 

  66. 

  67. 

  68. <div class="viewcode-block" id="make_test_environ_builder"><a class="viewcode-back" href="../../flask/flask.html#flask.testing.make_test_environ_builder">[docs]</a><span class="k">def</span> <span class="nf">make_test_environ_builder</span><span class="p">(</span><span class="n">app</span><span class="p">,</span> <span class="n">path</span><span class="o">=</span><span class="s1">&#39;/&#39;</span><span class="p">,</span> <span class="n">base_url</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
    69. 

  69.     <span class="sd">&quot;&quot;&quot;Creates a new test builder with some application defaults thrown in.&quot;&quot;&quot;</span>
    70. 

  70.     <span class="n">http_host</span> <span class="o">=</span> <span class="n">app</span><span class="o">.</span><span class="n">config</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;SERVER_NAME&#39;</span><span class="p">)</span>
    71. 

  71.     <span class="n">app_root</span> <span class="o">=</span> <span class="n">app</span><span class="o">.</span><span class="n">config</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;APPLICATION_ROOT&#39;</span><span class="p">)</span>
    72. 

  72.     <span class="k">if</span> <span class="n">base_url</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
    73. 

  73.         <span class="n">url</span> <span class="o">=</span> <span class="n">url_parse</span><span class="p">(</span><span class="n">path</span><span class="p">)</span>
    74. 

  74.         <span class="n">base_url</span> <span class="o">=</span> <span class="s1">&#39;http://</span><span class="si">%s</span><span class="s1">/&#39;</span> <span class="o">%</span> <span class="p">(</span><span class="n">url</span><span class="o">.</span><span class="n">netloc</span> <span class="ow">or</span> <span class="n">http_host</span> <span class="ow">or</span> <span class="s1">&#39;localhost&#39;</span><span class="p">)</span>
    75. 

  75.         <span class="k">if</span> <span class="n">app_root</span><span class="p">:</span>
    76. 

  76.             <span class="n">base_url</span> <span class="o">+=</span> <span class="n">app_root</span><span class="o">.</span><span class="n">lstrip</span><span class="p">(</span><span class="s1">&#39;/&#39;</span><span class="p">)</span>
    77. 

  77.         <span class="k">if</span> <span class="n">url</span><span class="o">.</span><span class="n">netloc</span><span class="p">:</span>
    78. 

  78.             <span class="n">path</span> <span class="o">=</span> <span class="n">url</span><span class="o">.</span><span class="n">path</span>
    79. 

  79.             <span class="k">if</span> <span class="n">url</span><span class="o">.</span><span class="n">query</span><span class="p">:</span>
    80. 

  80.                 <span class="n">path</span> <span class="o">+=</span> <span class="s1">&#39;?&#39;</span> <span class="o">+</span> <span class="n">url</span><span class="o">.</span><span class="n">query</span>
    81. 

  81.     <span class="k">return</span> <span class="n">EnvironBuilder</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="n">base_url</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span></div>
    82. 

  82. 

  83. 

  84. <div class="viewcode-block" id="FlaskClient"><a class="viewcode-back" href="../../flask/flask.html#flask.testing.FlaskClient">[docs]</a><span class="k">class</span> <span class="nc">FlaskClient</span><span class="p">(</span><span class="n">Client</span><span class="p">):</span>
    85. 

  85.     <span class="sd">&quot;&quot;&quot;Works like a regular Werkzeug test client but has some knowledge about</span>
    86. 

  86. <span class="sd">    how Flask works to defer the cleanup of the request context stack to the</span>
    87. 

  87. <span class="sd">    end of a ``with`` body when used in a ``with`` statement.  For general</span>
    88. 

  88. <span class="sd">    information about how to use this class refer to</span>
    89. 

  89. <span class="sd">    :class:`werkzeug.test.Client`.</span>
    90. 

  90. 

  91. <span class="sd">    Basic usage is outlined in the :ref:`testing` chapter.</span>
    92. 

  92. <span class="sd">    &quot;&quot;&quot;</span>
    93. 

  93. 

  94.     <span class="n">preserve_context</span> <span class="o">=</span> <span class="kc">False</span>
    95. 

  95. 

  96.     <span class="nd">@contextmanager</span>
    97. 

  97. <div class="viewcode-block" id="FlaskClient.session_transaction"><a class="viewcode-back" href="../../flask/flask.html#flask.testing.FlaskClient.session_transaction">[docs]</a>    <span class="k">def</span> <span class="nf">session_transaction</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
    98. 

  98.         <span class="sd">&quot;&quot;&quot;When used in combination with a ``with`` statement this opens a</span>
    99. 

  99. <span class="sd">        session transaction.  This can be used to modify the session that</span>
    100. 

  100. <span class="sd">        the test client uses.  Once the ``with`` block is left the session is</span>
    101. 

  101. <span class="sd">        stored back.</span>
    102. 

  102. 

  103. <span class="sd">        ::</span>
    104. 

  104. 

  105. <span class="sd">            with client.session_transaction() as session:</span>
    106. 

  106. <span class="sd">                session[&#39;value&#39;] = 42</span>
    107. 

  107. 

  108. <span class="sd">        Internally this is implemented by going through a temporary test</span>
    109. 

  109. <span class="sd">        request context and since session handling could depend on</span>
    110. 

  110. <span class="sd">        request variables this function accepts the same arguments as</span>
    111. 

  111. <span class="sd">        :meth:`~flask.Flask.test_request_context` which are directly</span>
    112. 

  112. <span class="sd">        passed through.</span>
    113. 

  113. <span class="sd">        &quot;&quot;&quot;</span>
    114. 

  114.         <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">cookie_jar</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
    115. 

  115.             <span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s1">&#39;Session transactions only make sense &#39;</span>
    116. 

  116.                                <span class="s1">&#39;with cookies enabled.&#39;</span><span class="p">)</span>
    117. 

  117.         <span class="n">app</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">application</span>
    118. 

  118.         <span class="n">environ_overrides</span> <span class="o">=</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">setdefault</span><span class="p">(</span><span class="s1">&#39;environ_overrides&#39;</span><span class="p">,</span> <span class="p">{})</span>
    119. 

  119.         <span class="bp">self</span><span class="o">.</span><span class="n">cookie_jar</span><span class="o">.</span><span class="n">inject_wsgi</span><span class="p">(</span><span class="n">environ_overrides</span><span class="p">)</span>
    120. 

  120.         <span class="n">outer_reqctx</span> <span class="o">=</span> <span class="n">_request_ctx_stack</span><span class="o">.</span><span class="n">top</span>
    121. 

  121.         <span class="k">with</span> <span class="n">app</span><span class="o">.</span><span class="n">test_request_context</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span> <span class="k">as</span> <span class="n">c</span><span class="p">:</span>
    122. 

  122.             <span class="n">sess</span> <span class="o">=</span> <span class="n">app</span><span class="o">.</span><span class="n">open_session</span><span class="p">(</span><span class="n">c</span><span class="o">.</span><span class="n">request</span><span class="p">)</span>
    123. 

  123.             <span class="k">if</span> <span class="n">sess</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
    124. 

  124.                 <span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s1">&#39;Session backend did not open a session. &#39;</span>
    125. 

  125.                                    <span class="s1">&#39;Check the configuration&#39;</span><span class="p">)</span>
    126. 

  126. 

  127.             <span class="c1"># Since we have to open a new request context for the session</span>
    128. 

  128.             <span class="c1"># handling we want to make sure that we hide out own context</span>
    129. 

  129.             <span class="c1"># from the caller.  By pushing the original request context</span>
    130. 

  130.             <span class="c1"># (or None) on top of this and popping it we get exactly that</span>
    131. 

  131.             <span class="c1"># behavior.  It&#39;s important to not use the push and pop</span>
    132. 

  132.             <span class="c1"># methods of the actual request context object since that would</span>
    133. 

  133.             <span class="c1"># mean that cleanup handlers are called</span>
    134. 

  134.             <span class="n">_request_ctx_stack</span><span class="o">.</span><span class="n">push</span><span class="p">(</span><span class="n">outer_reqctx</span><span class="p">)</span>
    135. 

  135.             <span class="k">try</span><span class="p">:</span>
    136. 

  136.                 <span class="k">yield</span> <span class="n">sess</span>
    137. 

  137.             <span class="k">finally</span><span class="p">:</span>
    138. 

  138.                 <span class="n">_request_ctx_stack</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span>
    139. 

  139. 

  140.             <span class="n">resp</span> <span class="o">=</span> <span class="n">app</span><span class="o">.</span><span class="n">response_class</span><span class="p">()</span>
    141. 

  141.             <span class="k">if</span> <span class="ow">not</span> <span class="n">app</span><span class="o">.</span><span class="n">session_interface</span><span class="o">.</span><span class="n">is_null_session</span><span class="p">(</span><span class="n">sess</span><span class="p">):</span>
    142. 

  142.                 <span class="n">app</span><span class="o">.</span><span class="n">save_session</span><span class="p">(</span><span class="n">sess</span><span class="p">,</span> <span class="n">resp</span><span class="p">)</span>
    143. 

  143.             <span class="n">headers</span> <span class="o">=</span> <span class="n">resp</span><span class="o">.</span><span class="n">get_wsgi_headers</span><span class="p">(</span><span class="n">c</span><span class="o">.</span><span class="n">request</span><span class="o">.</span><span class="n">environ</span><span class="p">)</span>
    144. 

  144.             <span class="bp">self</span><span class="o">.</span><span class="n">cookie_jar</span><span class="o">.</span><span class="n">extract_wsgi</span><span class="p">(</span><span class="n">c</span><span class="o">.</span><span class="n">request</span><span class="o">.</span><span class="n">environ</span><span class="p">,</span> <span class="n">headers</span><span class="p">)</span></div>
    145. 

  145. 

  146. <div class="viewcode-block" id="FlaskClient.open"><a class="viewcode-back" href="../../flask/flask.html#flask.testing.FlaskClient.open">[docs]</a>    <span class="k">def</span> <span class="nf">open</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
    147. 

  147.         <span class="n">kwargs</span><span class="o">.</span><span class="n">setdefault</span><span class="p">(</span><span class="s1">&#39;environ_overrides&#39;</span><span class="p">,</span> <span class="p">{})</span> \
    148. 

  148.             <span class="p">[</span><span class="s1">&#39;flask._preserve_context&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">preserve_context</span>
    149. 

  149. 

  150.         <span class="n">as_tuple</span> <span class="o">=</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s1">&#39;as_tuple&#39;</span><span class="p">,</span> <span class="kc">False</span><span class="p">)</span>
    151. 

  151.         <span class="n">buffered</span> <span class="o">=</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s1">&#39;buffered&#39;</span><span class="p">,</span> <span class="kc">False</span><span class="p">)</span>
    152. 

  152.         <span class="n">follow_redirects</span> <span class="o">=</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s1">&#39;follow_redirects&#39;</span><span class="p">,</span> <span class="kc">False</span><span class="p">)</span>
    153. 

  153.         <span class="n">builder</span> <span class="o">=</span> <span class="n">make_test_environ_builder</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">application</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
    154. 

  154. 

  155.         <span class="k">return</span> <span class="n">Client</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">builder</span><span class="p">,</span>
    156. 

  156.                            <span class="n">as_tuple</span><span class="o">=</span><span class="n">as_tuple</span><span class="p">,</span>
    157. 

  157.                            <span class="n">buffered</span><span class="o">=</span><span class="n">buffered</span><span class="p">,</span>
    158. 

  158.                            <span class="n">follow_redirects</span><span class="o">=</span><span class="n">follow_redirects</span><span class="p">)</span></div>
    159. 

  159. 

  160.     <span class="k">def</span> <span class="nf">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    161. 

  161.         <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">preserve_context</span><span class="p">:</span>
    162. 

  162.             <span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s1">&#39;Cannot nest client invocations&#39;</span><span class="p">)</span>
    163. 

  163.         <span class="bp">self</span><span class="o">.</span><span class="n">preserve_context</span> <span class="o">=</span> <span class="kc">True</span>
    164. 

  164.         <span class="k">return</span> <span class="bp">self</span>
    165. 

  165. 

  166.     <span class="k">def</span> <span class="nf">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">exc_type</span><span class="p">,</span> <span class="n">exc_value</span><span class="p">,</span> <span class="n">tb</span><span class="p">):</span>
    167. 

  167.         <span class="bp">self</span><span class="o">.</span><span class="n">preserve_context</span> <span class="o">=</span> <span class="kc">False</span>
    168. 

  168. 

  169.         <span class="c1"># on exit we want to clean up earlier.  Normally the request context</span>
    170. 

  170.         <span class="c1"># stays preserved until the next request in the same thread comes</span>
    171. 

  171.         <span class="c1"># in.  See RequestGlobals.push() for the general behavior.</span>
    172. 

  172.         <span class="n">top</span> <span class="o">=</span> <span class="n">_request_ctx_stack</span><span class="o">.</span><span class="n">top</span>
    173. 

  173.         <span class="k">if</span> <span class="n">top</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="ow">and</span> <span class="n">top</span><span class="o">.</span><span class="n">preserved</span><span class="p">:</span>
    174. 

  174.             <span class="n">top</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span></div>
    175. 

  175. </pre></div>
    176. 

  176. 

  177.           </div>
    178. 

  178.         </div>
    179. 

  179.       </div>
    180. 

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