diff --git a/tests/phpunit/tests/date/currentTime.php b/tests/phpunit/tests/date/currentTime.php
index a0b03c3fd5..b3c59ed7db 100644
--- a/tests/phpunit/tests/date/currentTime.php
+++ b/tests/phpunit/tests/date/currentTime.php
@@ -3,6 +3,7 @@
 /**
  * @group date
  * @group datetime
+ * @covers ::current_time
  */
 class Tests_Date_Current_Time extends WP_UnitTestCase {
 
diff --git a/tests/phpunit/tests/date/dateI18n.php b/tests/phpunit/tests/date/dateI18n.php
index 5904a23051..f4d833c85f 100644
--- a/tests/phpunit/tests/date/dateI18n.php
+++ b/tests/phpunit/tests/date/dateI18n.php
@@ -3,6 +3,7 @@
 /**
  * @group date
  * @group datetime
+ * @covers ::date_i18n
  */
 class Tests_Date_I18n extends WP_UnitTestCase {
 
diff --git a/tests/phpunit/tests/date/getCommentDate.php b/tests/phpunit/tests/date/getCommentDate.php
index 95175c3e16..7dac03d262 100644
--- a/tests/phpunit/tests/date/getCommentDate.php
+++ b/tests/phpunit/tests/date/getCommentDate.php
@@ -4,6 +4,7 @@
  * @group date
  * @group datetime
  * @group comment
+ * @covers ::get_comment_date
  */
 class Tests_Date_Get_Comment_Date extends WP_UnitTestCase {
 
diff --git a/tests/phpunit/tests/date/getFeedBuildDate.php b/tests/phpunit/tests/date/getFeedBuildDate.php
index 6fcd2fdbd4..c604285a4b 100644
--- a/tests/phpunit/tests/date/getFeedBuildDate.php
+++ b/tests/phpunit/tests/date/getFeedBuildDate.php
@@ -4,6 +4,7 @@
  * @group date
  * @group datetime
  * @group feed
+ * @covers ::get_feed_build_date
  */
 class Tests_Date_Get_Feed_Build_Date extends WP_UnitTestCase {
 
diff --git a/tests/phpunit/tests/date/getPermalink.php b/tests/phpunit/tests/date/getPermalink.php
index 782a0507fe..5ffd902608 100644
--- a/tests/phpunit/tests/date/getPermalink.php
+++ b/tests/phpunit/tests/date/getPermalink.php
@@ -4,6 +4,7 @@
  * @group date
  * @group datetime
  * @group post
+ * @covers ::get_permalink
  */
 class Tests_Date_Get_Permalink extends WP_UnitTestCase {
 
diff --git a/tests/phpunit/tests/date/getPostTime.php b/tests/phpunit/tests/date/getPostTime.php
index 9a58476681..0322cdca4d 100644
--- a/tests/phpunit/tests/date/getPostTime.php
+++ b/tests/phpunit/tests/date/getPostTime.php
@@ -4,6 +4,8 @@
  * @group date
  * @group datetime
  * @group post
+ * @covers ::get_post_time
+ * @covers ::get_post_modified_time
  */
 class Tests_Date_Get_Post_Time extends WP_UnitTestCase {
 
diff --git a/tests/phpunit/tests/date/getTheDate.php b/tests/phpunit/tests/date/getTheDate.php
index 1f1f8f223f..70f85d6022 100644
--- a/tests/phpunit/tests/date/getTheDate.php
+++ b/tests/phpunit/tests/date/getTheDate.php
@@ -4,6 +4,7 @@
  * @group date
  * @group datetime
  * @group post
+ * @covers ::get_the_date
  */
 class Tests_Date_Get_The_Date extends WP_UnitTestCase {
 
diff --git a/tests/phpunit/tests/date/getTheModifiedDate.php b/tests/phpunit/tests/date/getTheModifiedDate.php
index 6ff1fb752e..3e556527c4 100644
--- a/tests/phpunit/tests/date/getTheModifiedDate.php
+++ b/tests/phpunit/tests/date/getTheModifiedDate.php
@@ -4,6 +4,7 @@
  * @group date
  * @group datetime
  * @group post
+ * @covers ::get_the_modified_date
  */
 class Tests_Date_Get_The_Modified_Date extends WP_UnitTestCase {
 
diff --git a/tests/phpunit/tests/date/maybeDeclineDate.php b/tests/phpunit/tests/date/maybeDeclineDate.php
index 400662a5e2..eadaa03485 100644
--- a/tests/phpunit/tests/date/maybeDeclineDate.php
+++ b/tests/phpunit/tests/date/maybeDeclineDate.php
@@ -4,6 +4,7 @@
  * @group functions.php
  * @group i18n
  * @group datetime
+ * @covers ::wp_maybe_decline_date
  */
 class Tests_Functions_MaybeDeclineDate extends WP_UnitTestCase {
 
diff --git a/tests/phpunit/tests/date/mysql2date.php b/tests/phpunit/tests/date/mysql2date.php
index 81ae9f13d0..ebed6300de 100644
--- a/tests/phpunit/tests/date/mysql2date.php
+++ b/tests/phpunit/tests/date/mysql2date.php
@@ -3,6 +3,7 @@
 /**
  * @group date
  * @group datetime
+ * @covers ::mysql2date
  */
 class Tests_Date_mysql2date extends WP_UnitTestCase {
 
diff --git a/tests/phpunit/tests/date/query.php b/tests/phpunit/tests/date/query.php
index 9f8c98f574..15f0133a2b 100644
--- a/tests/phpunit/tests/date/query.php
+++ b/tests/phpunit/tests/date/query.php
@@ -7,6 +7,7 @@
  *
  * @group datequery
  * @group date
+ * @covers WP_Date_Query
  */
 class Tests_WP_Date_Query extends WP_UnitTestCase {
 	/**
@@ -293,6 +294,11 @@ class Tests_WP_Date_Query extends WP_UnitTestCase {
 		remove_filter( 'date_query_valid_columns', array( $this, 'date_query_valid_columns_callback' ) );
 	}
 
+	public function date_query_valid_columns_callback( $columns ) {
+		$columns[] = 'my_custom_column';
+		return $columns;
+	}
+
 	/**
 	 * @ticket 25775
 	 */
@@ -1129,11 +1135,4 @@ class Tests_WP_Date_Query extends WP_UnitTestCase {
 		// MySQL ignores the invalid clause.
 		$this->assertSame( array( $p1, $p2 ), $q->posts );
 	}
-
-	/** Helpers */
-
-	public function date_query_valid_columns_callback( $columns ) {
-		$columns[] = 'my_custom_column';
-		return $columns;
-	}
 }
diff --git a/tests/phpunit/tests/date/theDate.php b/tests/phpunit/tests/date/theDate.php
index a6e67eaf41..1fc5dffd95 100644
--- a/tests/phpunit/tests/date/theDate.php
+++ b/tests/phpunit/tests/date/theDate.php
@@ -4,6 +4,8 @@
  * @group date
  * @group datetime
  * @group post
+ * @covers ::the_date
+ * @covers ::the_weekday_date
  */
 class Tests_Date_The_Date extends WP_UnitTestCase {
 
diff --git a/tests/phpunit/tests/date/wpDate.php b/tests/phpunit/tests/date/wpDate.php
index 2b3212f395..3c7fb46611 100644
--- a/tests/phpunit/tests/date/wpDate.php
+++ b/tests/phpunit/tests/date/wpDate.php
@@ -3,6 +3,7 @@
 /**
  * @group date
  * @group datetime
+ * @covers ::wp_date
  */
 class Tests_Date_WP_Date extends WP_UnitTestCase {
 
diff --git a/tests/phpunit/tests/date/wpTimezone.php b/tests/phpunit/tests/date/wpTimezone.php
index 5306b77786..8edf0b9730 100644
--- a/tests/phpunit/tests/date/wpTimezone.php
+++ b/tests/phpunit/tests/date/wpTimezone.php
@@ -3,6 +3,8 @@
 /**
  * @group date
  * @group datetime
+ * @covers ::wp_timezone_string
+ * @covers ::wp_timezone
  */
 class Tests_Date_WP_Timezone extends WP_UnitTestCase {
 
diff --git a/tests/phpunit/tests/date/xmlrpc.php b/tests/phpunit/tests/date/xmlrpc.php
index 285cddd645..6fe96618bc 100644
--- a/tests/phpunit/tests/date/xmlrpc.php
+++ b/tests/phpunit/tests/date/xmlrpc.php
@@ -4,11 +4,14 @@
  * @group date
  * @group datetime
  * @group xmlrpc
+ * @covers IXR_Date
  */
 class Tests_Date_XMLRPC extends WP_XMLRPC_UnitTestCase {
 
 	/**
 	 * @ticket 30429
+	 *
+	 * @covers wp_xmlrpc_server::mw_newPost
 	 */
 	public function test_date_new_post() {
 		$timezone = 'Europe/Kiev';
@@ -127,6 +130,8 @@ class Tests_Date_XMLRPC extends WP_XMLRPC_UnitTestCase {
 
 	/**
 	 * @ticket 30429
+	 *
+	 * @covers wp_xmlrpc_server::mw_editPost
 	 */
 	public function test_date_edit_post() {
 		$timezone = 'Europe/Kiev';
@@ -194,6 +199,8 @@ class Tests_Date_XMLRPC extends WP_XMLRPC_UnitTestCase {
 
 	/**
 	 * @ticket 30429
+	 *
+	 * @covers wp_xmlrpc_server::wp_editComment
 	 */
 	function test_date_edit_comment() {
 		$timezone = 'Europe/Kiev';