diff --git a/.phpcs.xml.dist b/.phpcs.xml.dist
index 06a8483..03b2fb8 100644
--- a/.phpcs.xml.dist
+++ b/.phpcs.xml.dist
@@ -62,10 +62,16 @@
 	</rule>
 
 	<!-- Enforce PSR1 compatible namespaces. -->
-	<rule ref="PSR1.Classes.ClassDeclaration"/>
+	<rule ref="PSR1.Classes.ClassDeclaration">
+		<!-- YoastCS only applies this rule to test files. Overrule it to apply to all files. -->
+		<include-pattern>*\.php$</include-pattern>
+	</rule>
 
 	<!-- Enforce Final classes to prevent issues with the PHPCS autoloader. -->
-	<rule ref="Universal.Classes.RequireFinalClass"/>
+	<rule ref="Universal.Classes.RequireFinalClass">
+		<!-- YoastCS only applies this rule to test files. Overrule it to apply to all files. -->
+		<include-pattern>*\.php$</include-pattern>
+	</rule>
 
 
 	<!--
diff --git a/Yoast/ruleset.xml b/Yoast/ruleset.xml
index 6589eb1..344b776 100644
--- a/Yoast/ruleset.xml
+++ b/Yoast/ruleset.xml
@@ -450,4 +450,44 @@
 	<!-- Modernize: Enforce a nullable type declaration when the param has a null default value (PHP 7.1+). -->
 	<rule ref="SlevomatCodingStandard.TypeHints.NullableTypeForNullDefaultValue"/>
 
+
+	<!--
+	#############################################################################
+	RULES SPECIFICALLY FOR THE AUTOMATED TESTS
+	A few rules never need to be applied to test files.
+	Other rules should _only_ be applied to test files.
+	#############################################################################
+	-->
+	<!-- Tests are not run within the context of a WP install, so overwriting WP globals is fine
+		 (as long as they're reset after). -->
+	<rule ref="WordPress.WP.GlobalVariablesOverride">
+		<exclude-pattern>*/tests/*\.php$</exclude-pattern>
+	</rule>
+
+	<!-- It is fine to use the PHP json_encode() function for mocking the WP/Yoast alternative
+		 or for setting up the "expected" value. -->
+	<rule ref="Yoast.Yoast.JsonEncodeAlternative">
+		<exclude-pattern>*/tests/*\.php$</exclude-pattern>
+	</rule>
+
+	<!-- Double classes may overload methods in the parent class to just change visibility. -->
+	<rule ref="Generic.CodeAnalysis.UselessOverridingMethod">
+		<exclude-pattern>*/tests(/*)?/Doubles/*\.php$</exclude-pattern>
+	</rule>
+
+	<!-- Enforce that all test code is namespaced. -->
+	<rule ref="PSR1.Classes.ClassDeclaration">
+		<include-pattern>*/tests/*\.php$</include-pattern>
+
+		<!-- "One object per file" is already enforced by another sniff, so don't report. -->
+		<exclude name="PSR1.Classes.ClassDeclaration.MultipleClasses"/>
+	</rule>
+
+	<!-- Enforce that all test classes are either final or abstract. -->
+	<rule ref="Universal.Classes.RequireFinalClass">
+		<include-pattern>*/tests/*\.php$</include-pattern>
+		<!-- But don't enforce this for Mock/Double classes. -->
+		<exclude-pattern>*/tests(/*)?/Doubles/*\.php$</exclude-pattern>
+	</rule>
+
 </ruleset>