Don’t allow paragraphs without class attribute

All paragraphs should have class="govuk-body", or be otherwise
custom-styled. This commit adds some extra checks to our test fixture
that looks for paragraphs that don’t have any styling. Our test coverage
is pretty good, so this should check almost all pages, and prevent
regressions.

I’ve done this in such a way that it can be extended for other elements
(e.g. links) in the future.

app/templates/views/uploads/choose-file.html

@@ -14,7 +14,7 @@
       {% call banner_wrapper(type='dangerous') %}
         <h1 class="banner-title">{{ error.title }}</h1>
         {% if error.detail %}
-          <p>{{ error.detail | safe }}</p>
+          <p class="govuk-body">{{ error.detail | safe }}</p>
         {% endif %}
       {% endcall %}
     {% else %}
@@ -22,11 +22,11 @@
         'Upload a letter',
         back_link=url_for('main.uploads', service_id=current_service.id)
     ) }}
-    <p>Upload a single letter as a PDF and we’ll print, pack and post it for you.</p>
-    <p>You can use this feature if you send a lot of one-off letters or if our reusable letter templates do not meet your needs.</p>
+    <p class="govuk-body">Upload a single letter as a PDF and we’ll print, pack and post it for you.</p>
+    <p class="govuk-body">You can use this feature if you send a lot of one-off letters or if our reusable letter templates do not meet your needs.</p>
     {% endif %}
 
-  <p>
+  <p class="govuk-body">
     {{ file_upload(
       form.file,
       action=url_for('main.upload_letter', service_id=current_service.id),
@@ -37,9 +37,9 @@
 
   <h2 class="heading-medium">Your file must meet our letter specification</h2>
 
-  <p>The content of your letter must appear inside the printable area.</p>
+  <p class="govuk-body">The content of your letter must appear inside the printable area.</p>
 
-  <p>Your file must be:</p>
+  <p class="govuk-body">Your file must be:</p>
 
     <ul class="list list-bullet">
       <li>a PDF</li>
@@ -48,7 +48,7 @@
       <li>smaller than 2MB</li>
     </ul>
 
-  <p>To help you set up your letter, you can download our <a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.letter_spec') }}">letter specification document (PDF)</a>.</p>
+  <p class="govuk-body">To help you set up your letter, you can download our <a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.letter_spec') }}">letter specification document (PDF)</a>.</p>
   </div>
 </div>
 {% endblock %}

app/templates/views/uploads/contact-list/column-errors.html

@@ -29,7 +29,7 @@
         <h1 class='banner-title' data-module="track-error" data-error-type="Too many rows" data-error-label="{{ upload_id }}">
           Your file has too many rows
         </h1>
-        <p>
+        <p class="govuk-body">
           Notify can store files up to
           {{ "{:,}".format(recipients.max_rows) }} rows in size. Your
           file has {{ "{:,}".format(recipients|length) }} rows.
@@ -42,7 +42,7 @@
           {{ 'this' if recipients|length == 1 else 'these' }}
           {{ recipient_count_label(recipients|length, recipients.template_type) }}
         </h1>
-        <p>
+        <p class="govuk-body">
           In <a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.trial_mode_new') }}">trial mode</a> you can only
           send to yourself and members of your team
         </p>

app/templates/views/uploads/contact-list/row-errors.html

@@ -27,14 +27,14 @@
         <h1 class='banner-title' data-module="track-error" data-error-type="Bad rows" data-error-label="{{ upload_id }}">
           There’s a problem with {{ original_file_name }}
         </h1>
-        <p>
+        <p class="govuk-body">
           You need to {{ row_errors[0] }}.
         </p>
       {% else %}
         <h1 class='banner-title' data-module="track-error" data-error-type="Bad rows" data-error-label="{{ upload_id }}">
           There are some problems with {{ original_file_name }}
         </h1>
-        <p>
+        <p class="govuk-body">
           You need to:
         </p>
         <ul class="list-bullet">

app/templates/views/uploads/contact-list/too-many-columns.html

@@ -29,7 +29,7 @@
         <h1 class='banner-title' data-module="track-error" data-error-type="No rows" data-error-label="{{ upload_id }}">
           Your file is missing some rows
         </h1>
-        <p>
+        <p class="govuk-body">
           It needs at least one row of data
           {%- if template_type %}.{% else %}, in a column called ‘email address’ or ‘phone number’.{% endif %}
         </p>
@@ -39,7 +39,7 @@
         <h1 class='banner-title' data-module="track-error" data-error-type="Too many rows" data-error-label="{{ upload_id }}">
           Your file needs a column called ‘email address’ or ‘phone number’.
         </h1>
-        <p>
+        <p class="govuk-body">
           Right now it has 1 column called ‘{{ recipients._raw_column_headers[0] }}’.
         </p>
 
@@ -48,10 +48,10 @@
         <h1 class='banner-title' data-module="track-error" data-error-type="Too many rows" data-error-label="{{ upload_id }}">
           Your file has too many columns
         </h1>
-        <p>
+        <p class="govuk-body">
           It needs to have 1 column, called ‘email address’ or ‘phone number’.
         </p>
-        <p>
+        <p class="govuk-body">
           Right now it has {{ recipients._raw_column_headers|length }} columns called {{ recipients._raw_column_headers | formatted_list }}.
         </p>
 

app/templates/views/uploads/contact-list/upload.html

@@ -13,7 +13,7 @@
     {% call banner_wrapper(type='dangerous') %}
       <h1 class="banner-title">{{ error.title }}</h1>
       {% if error.detail %}
-        <p>{{ error.detail | safe }}</p>
+        <p class="govuk-body">{{ error.detail | safe }}</p>
       {% endif %}
     {% endcall %}
   {% else %}