I have a context aware block I've created

    /**
     * Provide a context aware block.
     *
     * @Block(
     *   id = "my_context_aware_block",
     *   admin_label = @Translation("My context aware block"),
     *   category = @Translation("Display some node information"),
     *   context = {
     *     "node" = @ContextDefinition(
     *       "entity:node",
     *       label = @Translation("Current Node")
     *     )
     *   }
     * )
     */

It references the current node in the build method.

    $node = $this->getContextValue('node');

Everything works as expected in my "live" environment. The issue I am encountering is that my functional test is NOT displaying the block when it IS in a context in which it should show. (I haven't bothered testing a context in which the block is not supposed to show.)

      public function testSomeStuff() {
        // Create a piece of content
        $node = $this->drupalCreateNode(array(
          'title' => t('My sample node'),
          'type' => 'a_valid_node_type',
        ));
        $node->save();
    
        // Place the block in the sidebar
        $this->drupalPlaceBlock('my_context_aware_block');
    
        $this->drupalGet('node/' . $node->id());
    
        // Note: Whether I check the page content or the response, I don't see
        //       the block there. I am showing examples of both just for the
        //       sake of providing detail in this question.
        $this->assertContains('force phpunit to fail so that I can manually look at the text content', $this->getTextContent());
        $this->assertSession()->responseContains('some valid markup that appears in the block');
      }

I have even tested setting
  

    protected $profile = 'standard';

and the block still doesn't appear when I'm viewing the node I created [$this->drupalGet('node/' . $node->id());].

This is on Drupal 8.2.5.

I am inside of /drupal/root/directory/core running PHPUnit from the command line as such

    sudo -u www-data ../vendor/bin/phpunit ../modules/custom/my_module/tests/src/Functional/MyFunctionalTest.php

Have I discovered a bug or is there something I am missing and doing wrong?