diff --git a/tests/phpunit/tests/post/template.php b/tests/phpunit/tests/post/template.php
index 9a34180a2a..c7de639b5a 100644
--- a/tests/phpunit/tests/post/template.php
+++ b/tests/phpunit/tests/post/template.php
@@ -1,200 +1,245 @@
-<?php
-
-class Tests_Post_Template extends WP_UnitTestCase {
-
-	function test_wp_link_pages() {
-		$contents = array( 'One', 'Two', 'Three' );
-		$content = join( '<!--nextpage-->', $contents );
-		$post_id = $this->factory->post->create( array( 'post_content' => $content ) );
-
-		$this->go_to( '?p=' . $post_id );
-
-		setup_postdata( get_post( $post_id ) );
-
-		$permalink = sprintf( '<a href="%s">', get_permalink() );
-		$page2 = _wp_link_page( 2 );
-		$page3 = _wp_link_page( 3 );
-
-		$expected = "<p>Pages: 1 {$page2}2</a> {$page3}3</a></p>";
-		$output = wp_link_pages( array( 'echo' => 0 ) );
-
-		$this->assertEquals( $expected, $output );
-
-		$before_after = " 1 {$page2}2</a> {$page3}3</a>";
-		$output = wp_link_pages( array( 'echo' => 0, 'before' => '', 'after' => '' ) );
-
-		$this->assertEquals( $before_after, $output );
-
-		$separator = " 1{$page2}2</a>{$page3}3</a>";
-		$output = wp_link_pages( array( 'echo' => 0, 'before' => '', 'after' => '', 'separator' => '' ) );
-
-		$this->assertEquals( $separator, $output );
-
-		$link = " <em>1</em>{$page2}<em>2</em></a>{$page3}<em>3</em></a>";
-		$output = wp_link_pages( array( 'echo' => 0, 'before' => '', 'after' => '', 'separator' => '',
-			'link_before' => '<em>', 'link_after' => '</em>'
-		) );
-
-		$this->assertEquals( $link, $output );
-
-		$next = "{$page2}<em>Next page</em></a>";
-		$output = wp_link_pages( array( 'echo' => 0, 'before' => '', 'after' => '', 'separator' => '',
-			'link_before' => '<em>', 'link_after' => '</em>', 'next_or_number' => 'next'
-		) );
-
-		$this->assertEquals( $next, $output );
-
-		$GLOBALS['page'] = 2;
-		$next_prev = "{$permalink}<em>Previous page</em></a>{$page3}<em>Next page</em></a>";
-		$output = wp_link_pages( array( 'echo' => 0, 'before' => '', 'after' => '', 'separator' => '',
-			'link_before' => '<em>', 'link_after' => '</em>', 'next_or_number' => 'next'
-		) );
-
-		$this->assertEquals( $next_prev, $output );
-
-		$next_prev_link = "{$permalink}Woo page</a>{$page3}Hoo page</a>";
-		$output = wp_link_pages( array( 'echo' => 0, 'before' => '', 'after' => '', 'separator' => '',
-			'next_or_number' => 'next', 'nextpagelink' => 'Hoo page', 'previouspagelink' => 'Woo page'
-		) );
-
-		$this->assertEquals( $next_prev_link, $output );
-
-		$GLOBALS['page'] = 1;
-		$separator = "<p>Pages: 1 | {$page2}2</a> | {$page3}3</a></p>";
-		$output = wp_link_pages( array( 'echo' => 0, 'separator' => ' | ' ) );
-
-		$this->assertEquals( $separator, $output );
-
-		$pagelink = " Page 1 | {$page2}Page 2</a> | {$page3}Page 3</a>";
-		$output = wp_link_pages( array( 'echo' => 0, 'separator' => ' | ', 'before' => '', 'after' => '',
-			'pagelink' => 'Page %'
-		) );
-
-		$this->assertEquals( $pagelink, $output );
-	}
-
-	function test_wp_dropdown_pages() {
-		$none = wp_dropdown_pages( array( 'echo' => 0 ) );
-		$this->assertEmpty( $none );
-
-		$bump = '&nbsp;&nbsp;&nbsp;';
-		$page_id = $this->factory->post->create( array( 'post_type' => 'page' ) );
-		$child_id = $this->factory->post->create( array( 'post_type' => 'page', 'post_parent' => $page_id ) );
-		$grandchild_id = $this->factory->post->create( array( 'post_type' => 'page', 'post_parent' => $child_id ) );
-
-		$lineage =<<<LINEAGE
-<select name='page_id' id='page_id'>
-	<option class="level-0" value="$page_id">Post title 1</option>
-	<option class="level-1" value="$child_id">{$bump}Post title 2</option>
-	<option class="level-2" value="$grandchild_id">{$bump}{$bump}Post title 3</option>
-</select>
-
-LINEAGE;
-
-		$output = wp_dropdown_pages( array( 'echo' => 0 ) );
-		$this->assertEquals( $lineage, $output );
-
-		$depth =<<<DEPTH
-<select name='page_id' id='page_id'>
-	<option class="level-0" value="$page_id">Post title 1</option>
-</select>
-
-DEPTH;
-
-		$output = wp_dropdown_pages( array( 'echo' => 0, 'depth' => 1 ) );
-		$this->assertEquals( $depth, $output );
-
-		$option_none =<<<NONE
-<select name='page_id' id='page_id'>
-	<option value="Woo">Hoo</option>
-	<option class="level-0" value="$page_id">Post title 1</option>
-</select>
-
-NONE;
-
-		$output = wp_dropdown_pages( array( 'echo' => 0, 'depth' => 1,
-			'show_option_none' => 'Hoo', 'option_none_value' => 'Woo'
-		) );
-		$this->assertEquals( $option_none, $output );
-
-		$option_no_change =<<<NO
-<select name='page_id' id='page_id'>
-	<option value="-1">Burrito</option>
-	<option value="Woo">Hoo</option>
-	<option class="level-0" value="$page_id">Post title 1</option>
-</select>
-
-NO;
-		$output = wp_dropdown_pages( array( 'echo' => 0, 'depth' => 1,
-			'show_option_none' => 'Hoo', 'option_none_value' => 'Woo',
-			'show_option_no_change' => 'Burrito'
-		) );
-		$this->assertEquals( $option_no_change, $output );
-	}
-
-	/**
-	 * @ticket 12494
-	 */
-	public function test_wp_dropdown_pages_value_field_should_default_to_ID() {
-		$p = $this->factory->post->create( array(
-			'post_type' => 'page',
-		) );
-
-		$found = wp_dropdown_pages( array(
-			'echo' => 0,
-		) );
-
-		// Should contain page ID by default.
-		$this->assertContains( 'value="' . $p . '"', $found );
-	}
-
-	/**
-	 * @ticket 12494
-	 */
-	public function test_wp_dropdown_pages_value_field_ID() {
-		$p = $this->factory->post->create( array(
-			'post_type' => 'page',
-		) );
-
-		$found = wp_dropdown_pages( array(
-			'echo' => 0,
-			'value_field' => 'ID',
-		) );
-
-		$this->assertContains( 'value="' . $p . '"', $found );
-	}
-
-	/**
-	 * @ticket 12494
-	 */
-	public function test_wp_dropdown_pages_value_field_post_name() {
-		$p = $this->factory->post->create( array(
-			'post_type' => 'page',
-			'post_name' => 'foo',
-		) );
-
-		$found = wp_dropdown_pages( array(
-			'echo' => 0,
-			'value_field' => 'post_name',
-		) );
-
-		$this->assertContains( 'value="foo"', $found );
-	}
-
-	/**
-	 * @ticket 12494
-	 */
-	public function test_wp_dropdown_pages_value_field_should_fall_back_on_ID_when_an_invalid_value_is_provided() {
-		$p = $this->factory->post->create( array(
-			'post_type' => 'page',
-			'post_name' => 'foo',
-		) );
-
-		$found = wp_dropdown_pages( array(
-			'echo' => 0,
-			'value_field' => 'foo',
-		) );
-
-		$this->assertContains( 'value="' . $p . '"', $found );
-	}
-}
+<?php
+
+class Tests_Post_Template extends WP_UnitTestCase {
+
+	function test_wp_link_pages() {
+		$contents = array( 'One', 'Two', 'Three' );
+		$content = join( '<!--nextpage-->', $contents );
+		$post_id = $this->factory->post->create( array( 'post_content' => $content ) );
+
+		$this->go_to( '?p=' . $post_id );
+
+		setup_postdata( get_post( $post_id ) );
+
+		$permalink = sprintf( '<a href="%s">', get_permalink() );
+		$page2 = _wp_link_page( 2 );
+		$page3 = _wp_link_page( 3 );
+
+		$expected = "<p>Pages: 1 {$page2}2</a> {$page3}3</a></p>";
+		$output = wp_link_pages( array( 'echo' => 0 ) );
+
+		$this->assertEquals( $expected, $output );
+
+		$before_after = " 1 {$page2}2</a> {$page3}3</a>";
+		$output = wp_link_pages( array( 'echo' => 0, 'before' => '', 'after' => '' ) );
+
+		$this->assertEquals( $before_after, $output );
+
+		$separator = " 1{$page2}2</a>{$page3}3</a>";
+		$output = wp_link_pages( array( 'echo' => 0, 'before' => '', 'after' => '', 'separator' => '' ) );
+
+		$this->assertEquals( $separator, $output );
+
+		$link = " <em>1</em>{$page2}<em>2</em></a>{$page3}<em>3</em></a>";
+		$output = wp_link_pages( array( 'echo' => 0, 'before' => '', 'after' => '', 'separator' => '',
+			'link_before' => '<em>', 'link_after' => '</em>'
+		) );
+
+		$this->assertEquals( $link, $output );
+
+		$next = "{$page2}<em>Next page</em></a>";
+		$output = wp_link_pages( array( 'echo' => 0, 'before' => '', 'after' => '', 'separator' => '',
+			'link_before' => '<em>', 'link_after' => '</em>', 'next_or_number' => 'next'
+		) );
+
+		$this->assertEquals( $next, $output );
+
+		$GLOBALS['page'] = 2;
+		$next_prev = "{$permalink}<em>Previous page</em></a>{$page3}<em>Next page</em></a>";
+		$output = wp_link_pages( array( 'echo' => 0, 'before' => '', 'after' => '', 'separator' => '',
+			'link_before' => '<em>', 'link_after' => '</em>', 'next_or_number' => 'next'
+		) );
+
+		$this->assertEquals( $next_prev, $output );
+
+		$next_prev_link = "{$permalink}Woo page</a>{$page3}Hoo page</a>";
+		$output = wp_link_pages( array( 'echo' => 0, 'before' => '', 'after' => '', 'separator' => '',
+			'next_or_number' => 'next', 'nextpagelink' => 'Hoo page', 'previouspagelink' => 'Woo page'
+		) );
+
+		$this->assertEquals( $next_prev_link, $output );
+
+		$GLOBALS['page'] = 1;
+		$separator = "<p>Pages: 1 | {$page2}2</a> | {$page3}3</a></p>";
+		$output = wp_link_pages( array( 'echo' => 0, 'separator' => ' | ' ) );
+
+		$this->assertEquals( $separator, $output );
+
+		$pagelink = " Page 1 | {$page2}Page 2</a> | {$page3}Page 3</a>";
+		$output = wp_link_pages( array( 'echo' => 0, 'separator' => ' | ', 'before' => '', 'after' => '',
+			'pagelink' => 'Page %'
+		) );
+
+		$this->assertEquals( $pagelink, $output );
+	}
+
+	function test_wp_dropdown_pages() {
+		$none = wp_dropdown_pages( array( 'echo' => 0 ) );
+		$this->assertEmpty( $none );
+
+		$bump = '&nbsp;&nbsp;&nbsp;';
+		$page_id = $this->factory->post->create( array( 'post_type' => 'page' ) );
+		$child_id = $this->factory->post->create( array( 'post_type' => 'page', 'post_parent' => $page_id ) );
+		$grandchild_id = $this->factory->post->create( array( 'post_type' => 'page', 'post_parent' => $child_id ) );
+
+		$lineage =<<<LINEAGE
+<select name='page_id' id='page_id'>
+	<option class="level-0" value="$page_id">Post title 1</option>
+	<option class="level-1" value="$child_id">{$bump}Post title 2</option>
+	<option class="level-2" value="$grandchild_id">{$bump}{$bump}Post title 3</option>
+</select>
+
+LINEAGE;
+
+		$output = wp_dropdown_pages( array( 'echo' => 0 ) );
+		$this->assertEquals( $lineage, $output );
+
+		$depth =<<<DEPTH
+<select name='page_id' id='page_id'>
+	<option class="level-0" value="$page_id">Post title 1</option>
+</select>
+
+DEPTH;
+
+		$output = wp_dropdown_pages( array( 'echo' => 0, 'depth' => 1 ) );
+		$this->assertEquals( $depth, $output );
+
+		$option_none =<<<NONE
+<select name='page_id' id='page_id'>
+	<option value="Woo">Hoo</option>
+	<option class="level-0" value="$page_id">Post title 1</option>
+</select>
+
+NONE;
+
+		$output = wp_dropdown_pages( array( 'echo' => 0, 'depth' => 1,
+			'show_option_none' => 'Hoo', 'option_none_value' => 'Woo'
+		) );
+		$this->assertEquals( $option_none, $output );
+
+		$option_no_change =<<<NO
+<select name='page_id' id='page_id'>
+	<option value="-1">Burrito</option>
+	<option value="Woo">Hoo</option>
+	<option class="level-0" value="$page_id">Post title 1</option>
+</select>
+
+NO;
+		$output = wp_dropdown_pages( array( 'echo' => 0, 'depth' => 1,
+			'show_option_none' => 'Hoo', 'option_none_value' => 'Woo',
+			'show_option_no_change' => 'Burrito'
+		) );
+		$this->assertEquals( $option_no_change, $output );
+	}
+
+	/**
+	 * @ticket 12494
+	 */
+	public function test_wp_dropdown_pages_value_field_should_default_to_ID() {
+		$p = $this->factory->post->create( array(
+			'post_type' => 'page',
+		) );
+
+		$found = wp_dropdown_pages( array(
+			'echo' => 0,
+		) );
+
+		// Should contain page ID by default.
+		$this->assertContains( 'value="' . $p . '"', $found );
+	}
+
+	/**
+	 * @ticket 12494
+	 */
+	public function test_wp_dropdown_pages_value_field_ID() {
+		$p = $this->factory->post->create( array(
+			'post_type' => 'page',
+		) );
+
+		$found = wp_dropdown_pages( array(
+			'echo' => 0,
+			'value_field' => 'ID',
+		) );
+
+		$this->assertContains( 'value="' . $p . '"', $found );
+	}
+
+	/**
+	 * @ticket 12494
+	 */
+	public function test_wp_dropdown_pages_value_field_post_name() {
+		$p = $this->factory->post->create( array(
+			'post_type' => 'page',
+			'post_name' => 'foo',
+		) );
+
+		$found = wp_dropdown_pages( array(
+			'echo' => 0,
+			'value_field' => 'post_name',
+		) );
+
+		$this->assertContains( 'value="foo"', $found );
+	}
+
+	/**
+	 * @ticket 12494
+	 */
+	public function test_wp_dropdown_pages_value_field_should_fall_back_on_ID_when_an_invalid_value_is_provided() {
+		$p = $this->factory->post->create( array(
+			'post_type' => 'page',
+			'post_name' => 'foo',
+		) );
+
+		$found = wp_dropdown_pages( array(
+			'echo' => 0,
+			'value_field' => 'foo',
+		) );
+
+		$this->assertContains( 'value="' . $p . '"', $found );
+	}
+
+	/**
+	 * @ticket 31389
+	 */
+	public function test_get_page_template_slug_by_id() {
+		$page_id = $this->factory->post->create( array(
+			'post_type' => 'page',
+		) );
+
+		$this->assertEquals( '', get_page_template_slug( $page_id ) );
+
+		update_post_meta( $page_id, '_wp_page_template', 'default' );
+		$this->assertEquals( '', get_page_template_slug( $page_id ) );
+
+		update_post_meta( $page_id, '_wp_page_template', 'example.php' );
+		$this->assertEquals( 'example.php', get_page_template_slug( $page_id ) );
+	}
+
+	/**
+	 * @ticket 31389
+	 */
+	public function test_get_page_template_slug_from_loop() {
+		$page_id = $this->factory->post->create( array(
+			'post_type' => 'page',
+		) );
+
+		update_post_meta( $page_id, '_wp_page_template', 'example.php' );
+		$this->go_to( get_permalink( $page_id ) );
+
+		$this->assertEquals( 'example.php', get_page_template_slug() );
+	}
+
+	/**
+	 * @ticket 31389
+	 */
+	public function test_get_page_template_slug_non_page() {
+		$post_id = $this->factory->post->create( array(
+			'post_type' => 'post',
+		) );
+
+		$this->assertFalse( get_page_template_slug( $post_id ) );
+
+		$this->go_to( get_permalink( $post_id ) );
+		$this->assertFalse( get_page_template_slug() );
+	}
+}