oliverdavies.uk/content/node.066297b1-ab00-4769-afe1-d3831ed2a654.json

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    "title": [
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            "value": "Writing assertions first"
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            "value": "\n          <p>As well as <a href=\"\/daily\/2024\/06\/03\/writing-comments-first\">writing comments first<\/a>, when writing tests, I sometimes like to write my tests backwards and start by writing the assertions first.<\/p>\n\n<p>I know what I want to assert in the test, so it's an easy place to start.<\/p>\n\n<p>I'll run it, see the error, fix it and continue working backwards.<\/p>\n\n<p>For example, I could start with this:<\/p>\n\n<pre><code class=\"php\">public function testOnlyPostNodesAreShown(): void {\n  $assert = $this-&gt;assertSession();\n  $assert-&gt;pageTextContains('Post one');\n  $assert-&gt;pageTextContains('Post two');\n  $assert-&gt;pageTextNotContains('This is not a post');\n}\n<\/code><\/pre>\n\n<p>This test will fail when I run it, but it makes me think about what I need to do to fix the error and how to do so in the best way.<\/p>\n\n<p>In this case, I need to make a request to the page that should render the text:<\/p>\n\n<pre><code class=\"php\">public function testOnlyPostNodesAreShown(): void {\n  $this-&gt;drupalGet('\/blog');\n\n  $assert = $this-&gt;assertSession();\n  $assert-&gt;pageTextContains('Post one');\n  $assert-&gt;pageTextContains('Post two');\n  $assert-&gt;pageTextNotContains('This is not a post');\n}\n<\/code><\/pre>\n\n<p>This will still fail, as I also need to create the required posts:<\/p>\n\n<pre><code class=\"php\">public function testOnlyPostNodesAreShown(): void {\n  PostBuilder::create()-&gt;setTitle('Post one')-&gt;getPost();\n  PostBuilder::create()-&gt;setTitle('Post two')-&gt;getPost();\n\n  $this-&gt;createNode([\n    'title' =&gt; 'This is not a post',\n    'type' =&gt; 'page',\n  ]);\n\n  $this-&gt;drupalGet('\/blog');\n\n  $assert = $this-&gt;assertSession();\n  $assert-&gt;pageTextContains('Post one');\n  $assert-&gt;pageTextContains('Post two');\n  $assert-&gt;pageTextNotContains('This is not a post');\n}\n<\/code><\/pre>\n\n<p>Now the test passes.<\/p>\n\n<p>Doing test-driven development keeps my code clean and minimal, and I find this approach keeps my test clean, too.<\/p>\n\n        ",
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            "processed": "\n          <p>As well as <a href=\"http:\/\/default\/daily\/2024\/06\/03\/writing-comments-first\">writing comments first<\/a>, when writing tests, I sometimes like to write my tests backwards and start by writing the assertions first.<\/p>\n\n<p>I know what I want to assert in the test, so it's an easy place to start.<\/p>\n\n<p>I'll run it, see the error, fix it and continue working backwards.<\/p>\n\n<p>For example, I could start with this:<\/p>\n\n<pre><code class=\"php\">public function testOnlyPostNodesAreShown(): void {\n  $assert = $this-&gt;assertSession();\n  $assert-&gt;pageTextContains('Post one');\n  $assert-&gt;pageTextContains('Post two');\n  $assert-&gt;pageTextNotContains('This is not a post');\n}\n<\/code><\/pre>\n\n<p>This test will fail when I run it, but it makes me think about what I need to do to fix the error and how to do so in the best way.<\/p>\n\n<p>In this case, I need to make a request to the page that should render the text:<\/p>\n\n<pre><code class=\"php\">public function testOnlyPostNodesAreShown(): void {\n  $this-&gt;drupalGet('\/blog');\n\n  $assert = $this-&gt;assertSession();\n  $assert-&gt;pageTextContains('Post one');\n  $assert-&gt;pageTextContains('Post two');\n  $assert-&gt;pageTextNotContains('This is not a post');\n}\n<\/code><\/pre>\n\n<p>This will still fail, as I also need to create the required posts:<\/p>\n\n<pre><code class=\"php\">public function testOnlyPostNodesAreShown(): void {\n  PostBuilder::create()-&gt;setTitle('Post one')-&gt;getPost();\n  PostBuilder::create()-&gt;setTitle('Post two')-&gt;getPost();\n\n  $this-&gt;createNode([\n    'title' =&gt; 'This is not a post',\n    'type' =&gt; 'page',\n  ]);\n\n  $this-&gt;drupalGet('\/blog');\n\n  $assert = $this-&gt;assertSession();\n  $assert-&gt;pageTextContains('Post one');\n  $assert-&gt;pageTextContains('Post two');\n  $assert-&gt;pageTextNotContains('This is not a post');\n}\n<\/code><\/pre>\n\n<p>Now the test passes.<\/p>\n\n<p>Doing test-driven development keeps my code clean and minimal, and I find this approach keeps my test clean, too.<\/p>\n\n        ",
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