diff --git a/WordPress/Tests/DB/PreparedSQLUnitTest.1.inc b/WordPress/Tests/DB/PreparedSQLUnitTest.1.inc
index 1f1a49076c..947f152711 100644
--- a/WordPress/Tests/DB/PreparedSQLUnitTest.1.inc
+++ b/WordPress/Tests/DB/PreparedSQLUnitTest.1.inc
@@ -33,7 +33,7 @@ $wpdb->query( "SELECT * FROM $wpdb->posts WHERE post_title LIKE '" . esc_sql( $f
 $wpdb->query( "SELECT * FROM $wpdb->posts WHERE ID = " . ABSINT( $foo ) . ";" ); // Ok.
 
 // Test multi-line strings.
-$all_post_meta = $wpdb->get_results( $wpdb->prepare( sprintf(
+$all_post_meta = $wpdb->get_results( $wpdb->prepare( \SPRINTF(
 	'SELECT `post_id`, `meta_value`
 	FROM `%s`
 	WHERE `meta_key` = "sort_order"
@@ -45,7 +45,7 @@ $all_post_meta = $wpdb->get_results( $wpdb->prepare( sprintf(
 $wpdb->query( "
 	SELECT *
 	FROM $wpdb->posts
-	WHERE post_title LIKE '" . esc_sql( $foo ) . "';"
+	WHERE post_title LIKE '" . \esc_SQL( $foo ) . "';"
 ); // Ok.
 
 $wpdb->query( $wpdb->prepare( "
@@ -143,5 +143,60 @@ echo $wpdb::CONSTANT_NAME;
 // Not an identifiable method call.
 $wpdb->{$methodName}('query');
 
-// Don't throw an error during live coding.
-wpdb::prepare( "SELECT * FROM $wpdb->posts
+/*
+ * Safeguard correct handling of all types of namespaced calls to the WPDB::prepare() method.
+ *
+ * Note that calling wpdb::prepare() statically will result in an error. Still, the tests are included here since the
+ * sniff handles those calls.
+ *
+ * Except for the fully qualified global call, the calls below are currently false positives. The sniff
+ * incorrectly identifies calls to a non-global class named `wpdb` preceded by a namespace separator as calls to the
+ * global `$wpdb` object. Related to: https://github.com/WordPress/WordPress-Coding-Standards/issues/2710.
+ */
+\WPDB::prepare( "SELECT * FROM $wpdb->posts WHERE post_title LIKE '" . foo() . "';" );
+MyNamespace\WPDB::prepare( "SELECT * FROM $wpdb->posts WHERE post_title LIKE '" . foo() . "';" );
+\MyNamespace\wpdb::prepare( "SELECT * FROM $wpdb->posts WHERE post_title LIKE '" . foo() . "';" );
+namespace\wpdb::prepare( "SELECT * FROM $wpdb->posts WHERE post_title LIKE '" . foo() . "';" ); // False positive (see comment above). This should be flagged in the future once the sniff is able to resolve relative namespaces.
+namespace\Sub\wpdb::prepare( "SELECT * FROM $wpdb->posts WHERE post_title LIKE '" . foo() . "';" );
+
+/*
+ * Safeguard correct handling of all types of namespaced calls to PreparedSQLSniff::$SQLEscapingFunctions.
+ *
+ * Note: The sniff currently has a limitation in how it identifies and counts errors for namespaced function calls that
+ * match function names in $SQLEscapingFunctions, $SQLAutoEscapedFunctions, or
+ * FormattingFunctionsHelper::$formattingFunctions. When it encounters such a call, it treats the function name as if it
+ * were a global function call and skips checking the contents. For example, `MyNamespace\absint( $foo )` should trigger
+ * two errors (one for MyNamespace\absint, one for $foo), but currently only triggers one error for "MyNamespace"
+ * because the sniff incorrectly treats "absint" as a valid global escaping function and skips its contents.
+ * Additionally, multi-level namespace calls like `namespace\Sub\count( $foo )` generate multiple errors (one for
+ * "namespace", one for "Sub") instead of recognizing it as a single namespaced function call. This will be easier to
+ * fix once only PHPCS 4 is supported. Reported in https://github.com/WordPress/WordPress-Coding-Standards/issues/2648.
+ */
+$wpdb->query( "SELECT * FROM $wpdb->posts WHERE ID = " . \absint( $foo ) );
+$wpdb->query( "SELECT * FROM $wpdb->posts WHERE ID = " . MyNamespace\esc_sql( $foo ) );
+$wpdb->query( "SELECT * FROM $wpdb->posts WHERE ID = " . \MyNamespace\intval( $foo ) );
+$wpdb->query( "SELECT * FROM $wpdb->posts WHERE ID = " . namespace\floatval( $foo ) ); // This should NOT be flagged in the future once the sniff is able to resolve relative namespaces.
+$wpdb->query( "SELECT * FROM $wpdb->posts WHERE ID = " . namespace\Sub\like_escape( $foo ) );
+
+/*
+ * Safeguard correct handling of all types of namespaced calls to PreparedSQLSniff::$SQLAutoEscapedFunctions.
+ *
+ * Note: See the comment above the $SQLEscapingFunctions tests for details about the sniff's current limitations.
+ */
+$wpdb->query( "SELECT * FROM $wpdb->posts WHERE ID = " . \count( $foo ) );
+$wpdb->query( "SELECT * FROM $wpdb->posts WHERE ID = " . \Count( $foo ) );
+$wpdb->query( "SELECT * FROM $wpdb->posts WHERE ID = " . MyNamespace\count( $foo ) );
+$wpdb->query( "SELECT * FROM $wpdb->posts WHERE ID = " . \MyNamespace\count( $foo ) );
+$wpdb->query( "SELECT * FROM $wpdb->posts WHERE ID = " . namespace\count( $foo ) ); // This should NOT be flagged in the future once the sniff is able to resolve relative namespaces.
+$wpdb->query( "SELECT * FROM $wpdb->posts WHERE ID = " . namespace\Sub\count( $foo ) );
+
+/*
+ * Safeguard correct handling of all types of namespaced calls to FormattingFunctionsHelper::$formattingFunctions.
+ *
+ * Note: See the comment above the $SQLEscapingFunctions tests for details about the sniff's current limitations.
+ */
+$wpdb->get_results( \sprintf( "SELECT * FROM $wpdb->posts WHERE ID = %s", intval( $id ) ) );
+$wpdb->get_results( MyNamespace\wp_sprintf( "SELECT * FROM $wpdb->posts WHERE ID = %s", intval( $id ) ) );
+$wpdb->get_results( \MyNamespace\sprintf( "SELECT * FROM $wpdb->posts WHERE ID = %s", intval( $id ) ) );
+$wpdb->get_results( namespace\wp_sprintf( "SELECT * FROM $wpdb->posts WHERE ID = %s", intval( $id ) ) ); // This should NOT be flagged in the future once the sniff is able to resolve relative namespaces.
+$wpdb->get_results( namespace\Sub\sprintf( "SELECT * FROM $wpdb->posts WHERE ID = %s", intval( $id ) ) );
diff --git a/WordPress/Tests/DB/PreparedSQLUnitTest.3.inc b/WordPress/Tests/DB/PreparedSQLUnitTest.3.inc
new file mode 100644
index 0000000000..4047216b82
--- /dev/null
+++ b/WordPress/Tests/DB/PreparedSQLUnitTest.3.inc
@@ -0,0 +1,8 @@
+<?php
+
+/*
+ * Intentional parse error (unclosed string).
+ * This should be the only test in this file.
+ */
+
+wpdb::prepare( "SELECT * FROM $wpdb->posts
diff --git a/WordPress/Tests/DB/PreparedSQLUnitTest.php b/WordPress/Tests/DB/PreparedSQLUnitTest.php
index 0a296ff984..54c503427e 100644
--- a/WordPress/Tests/DB/PreparedSQLUnitTest.php
+++ b/WordPress/Tests/DB/PreparedSQLUnitTest.php
@@ -66,6 +66,29 @@ public function getErrorList( $testFile = '' ) {
 					124 => 1,
 					128 => 1,
 					132 => 2,
+					156 => 1,
+
+					/**
+					 * False positives. See https://github.com/WordPress/WordPress-Coding-Standards/issues/2710 and
+					 * comment in the test case file.
+					 */
+					157 => 1,
+					158 => 1,
+					159 => 1,
+					160 => 1,
+
+					176 => 1,
+					177 => 1,
+					178 => 1,
+					179 => 2,
+					188 => 1,
+					189 => 1,
+					190 => 1,
+					191 => 2,
+					199 => 1,
+					200 => 1,
+					201 => 1,
+					202 => 2,
 				);
 
 			case 'PreparedSQLUnitTest.2.inc':