diff --git a/tests/_support/TestCases/TestCase.php b/tests/_support/TestCases/TestCase.php
index dc0f81636e..cfc36e8190 100644
--- a/tests/_support/TestCases/TestCase.php
+++ b/tests/_support/TestCases/TestCase.php
@@ -19,6 +19,9 @@ public function setUp() : void {
 		// Do anything we need to do to set up the environment for these tests.
 
 		$this->factory()->pmpro_level = new PMPro_LevelFactory();
+
+		// Reset the user to visitor before each test.
+		wp_set_current_user( 0 );
 	}
 
 	/**
diff --git a/tests/to-migrate/includes/test-functions.php b/tests/to-migrate/includes/test-functions.php
deleted file mode 100644
index 39c1e33a21..0000000000
--- a/tests/to-migrate/includes/test-functions.php
+++ /dev/null
@@ -1,218 +0,0 @@
-<?php
-namespace PMPro\Tests\Includes;
-
-use PMPro\Tests\Base;
-
-/**
- * @todo Move these tests over.
- */
-class Functions extends Base {
-
-    /**
-     * Skip all tests for now.
-     */
-    function setUp() {
-        $this->markTestSkipped( 'Tests need work -- skipping for now.' );
-    }
-
-	public function data_pmpro_getMembershipLevelsForUser() {
-		return [
-			[],
-		];
-	}
-
-	/**
-	 * @covers ::pmpro_getMembershipLevelsForUser()
-	 * @dataProvider data_pmpro_getMembershipLevelsForUser
-	 *
-	 * @param null $user_id
-	 * @param bool $include_inactive
-	 * @param bool $expects
-	 */
-	public function test_pmpro_getMembershipLevelsForUser( $user_id = null, $include_inactive = false, $expects = false ) {
-		$this->assertSame( $expects, pmpro_getMembershipLevelsForUser( $user_id, $include_inactive ) );
-	}
-
-	public function data_pmpro_changeMembershipLevel() {
-		$level_id   = $this->factory->pmpro_level->create();
-		$level_id_2 = $this->factory->pmpro_level->create();
-		$user_id    = $this->factory->user->create();
-
-		return [
-			[ // #0
-				null,
-			],
-			[ // #1
-				null,
-				$user_id,
-			],
-			[ // #2
-				$level_id,
-				$user_id,
-				'inactive',
-				null,
-				'assertTrue',
-			],
-		];
-	}
-
-	/**
-	 * @covers ::pmpro_changeMembershipLevel()
-	 * @dataProvider data_pmpro_changeMembershipLevel
-	 *
-	 * @param        $level
-	 * @param null   $user_id
-	 * @param string $old_level_status
-	 * @param null   $cancel_level
-	 * @param string $assert
-	 */
-	public function test_pmpro_changeMembershipLevel( $level, $user_id = null, $old_level_status = 'inactive', $cancel_level = null, $assert = 'assertFalse' ) {
-		$this->$assert( pmpro_changeMembershipLevel( $level, $user_id, $old_level_status, $cancel_level ) );
-	}
-
-	public function data_pmpro_hasMembershipLevel() {
-		$level_id   = $this->factory->pmpro_level->create();
-		$level_id_2 = $this->factory->pmpro_level->create();
-		$level      = pmpro_getLevel( $level_id );
-
-		$user_id   = $this->factory->user->create();
-		$user_id_2 = $this->factory->user->create();
-
-		pmpro_changeMembershipLevel( $level_id, $user_id );
-
-		return [
-			[ // #0
-				null,
-			],
-			[ // #1
-				[],
-			],
-			[ // #2
-				[ 0, $level_id ],
-				null,
-				false,
-				'assertTrue', // true?
-			],
-			[ // #3
-				0,
-				null,
-				false,
-				'assertTrue', // true? see line 774
-			],
-			[ // #4
-				'0',
-				null,
-				false,
-				'assertTrue', // true?see line 774
-			],
-			[ // #5
-				'',
-			],
-			[ // #6
-				-1,
-				null,
-				false,
-				'assertTrue', // true?
-			],
-//			[ // #7
-//				-1,
-//				$user_id,
-//				false,
-//				'assertTrue', // true?
-//			],
-			[ // #8
-				null,
-				$user_id,
-				false,
-				'assertTrue', // true?
-			],
-			[ // #9
-				$level_id,
-				$user_id,
-				false,
-				'assertTrue',
-			],
-			[ // #10
-				[ $level_id, $level_id_2 ],
-				$user_id,
-				false,
-				'assertTrue',
-			],
-			[ // #11
-				$level_id,
-				null,
-				$user_id,
-				'assertTrue',
-			],
-			[ // #12
-				'L',
-				$user_id,
-				$user_id,
-				'assertTrue',
-			],
-			[ // #13
-				'L',
-				$user_id_2,
-				$user_id_2,
-				'assertTrue',
-			],
-			[ // #14
-				'-L',
-				$user_id_2,
-				$user_id_2,
-			],
-			[ // #15
-				'-L',
-				$user_id,
-				$user_id_2,
-				'assertTrue',
-			],
-			[ // #16
-				'E',
-				$user_id,
-				$user_id_2,
-			],
-			[ // #17
-				'E',
-				$user_id_2,
-				$user_id_2,
-			],
-			[ // #18
-				$level->name,
-				null,
-				$user_id,
-				'assertTrue',
-			],
-			[ // #19
-				'Not Level Name',
-				null,
-				$user_id,
-				'assertFalse',
-			],
-		];
-	}
-
-	/**
-	 * @covers ::pmpro_hasMembershipLevel()
-	 * @dataProvider data_pmpro_hasMembershipLevel
-	 *
-	 * @param $levels
-	 * @param $user_id
-	 * @param $current_user
-	 * @param $assert
-	 */
-	public function test_pmpro_hasMembershipLevel( $levels = null, $user_id = null, $current_user = false, $assert = 'assertFalse' ) {
-
-		$global_current_user = $GLOBALS['current_user'];
-
-		if ( $current_user ) {
-			wp_set_current_user( $current_user );
-		}
-
-		$this->$assert( pmpro_hasMembershipLevel( $levels, $user_id ) );
-
-		$GLOBALS['current_user'] = $global_current_user;
-
-	}
-
-}
\ No newline at end of file
diff --git a/tests/wpunit/functions/Levels/ChangeMembershipLevelTest.php b/tests/wpunit/functions/Levels/ChangeMembershipLevelTest.php
new file mode 100644
index 0000000000..431764c767
--- /dev/null
+++ b/tests/wpunit/functions/Levels/ChangeMembershipLevelTest.php
@@ -0,0 +1,59 @@
+<?php
+
+namespace PMPro\Tests\Functions\Levels;
+
+use PMPro\Test_Support\Factories\PMPro_LevelFactory;
+use PMPro\Test_Support\TestCases\TestCase;
+
+/**
+ * @group pmpro-functions
+ * @group pmpro-levels
+ */
+class ChangeMembershipLevelTest extends TestCase {
+
+	/**
+	 * @covers ::pmpro_changeMembershipLevel()
+	 */
+	public function test_pmpro_changeMembershipLevel_is_false_with_empty_level_and_invalid_user() {
+		$this->assertFalse( pmpro_changeMembershipLevel( null ) );
+		$this->assertFalse( pmpro_changeMembershipLevel( 0 ) );
+		$this->assertFalse( pmpro_changeMembershipLevel( '' ) );
+		$this->assertFalse( pmpro_changeMembershipLevel( [] ) );
+	}
+
+	/**
+	 * @covers ::pmpro_changeMembershipLevel()
+	 */
+	public function test_pmpro_changeMembershipLevel_is_null_with_invalid_level_and_no_user_and_valid_current_user() {
+		$user_id = $this->factory->user->create();
+
+		wp_set_current_user( $user_id );
+
+		$this->assertNull( pmpro_changeMembershipLevel( null ) );
+		$this->assertNull( pmpro_changeMembershipLevel( 0 ) );
+		$this->assertNull( pmpro_changeMembershipLevel( '' ) );
+		$this->assertNull( pmpro_changeMembershipLevel( [] ) );
+	}
+
+	/**
+	 * @covers ::pmpro_changeMembershipLevel()
+	 */
+	public function test_pmpro_changeMembershipLevel_is_null_with_invalid_level_and_valid_user() {
+		$user_id = $this->factory()->user->create();
+
+		$this->assertNull( pmpro_changeMembershipLevel( null, $user_id ) );
+		$this->assertNull( pmpro_changeMembershipLevel( 0, $user_id ) );
+		$this->assertNull( pmpro_changeMembershipLevel( '', $user_id ) );
+		$this->assertNull( pmpro_changeMembershipLevel( [], $user_id ) );
+	}
+
+	/**
+	 * @covers ::pmpro_changeMembershipLevel()
+	 */
+	public function test_pmpro_changeMembershipLevel_is_true_with_valid_level_and_valid_user() {
+		$level_id = $this->factory()->pmpro_level->create();
+		$user_id  = $this->factory()->user->create();
+
+		$this->assertTrue( pmpro_changeMembershipLevel( $level_id, $user_id ) );
+	}
+}
\ No newline at end of file
diff --git a/tests/wpunit/functions/Levels/GetMembershipLevelsForUserTest.php b/tests/wpunit/functions/Levels/GetMembershipLevelsForUserTest.php
new file mode 100644
index 0000000000..d6b0132d42
--- /dev/null
+++ b/tests/wpunit/functions/Levels/GetMembershipLevelsForUserTest.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace PMPro\Tests\Functions\Levels;
+
+use PMPro\Test_Support\Factories\PMPro_LevelFactory;
+use PMPro\Test_Support\TestCases\TestCase;
+
+/**
+ * @group pmpro-functions
+ * @group pmpro-levels
+ */
+class GetMembershipLevelsForUserTest extends TestCase {
+
+	/**
+	 * @covers ::pmpro_getMembershipLevelsForUser()
+	 *
+	 * @param null $user_id
+	 * @param bool $include_inactive
+	 * @param bool $expects
+	 */
+	public function test_pmpro_getMembershipLevelsForUser( $user_id = null, $include_inactive = false, $expects = false ) {
+		$this->assertFalse( pmpro_getMembershipLevelsForUser( null, false ) );
+	}
+}
\ No newline at end of file
diff --git a/tests/wpunit/functions/Levels/HasMembershipLevelTest.php b/tests/wpunit/functions/Levels/HasMembershipLevelTest.php
new file mode 100644
index 0000000000..2ab882288a
--- /dev/null
+++ b/tests/wpunit/functions/Levels/HasMembershipLevelTest.php
@@ -0,0 +1,205 @@
+<?php
+
+namespace PMPro\Tests\Functions\Levels;
+
+use PMPro\Test_Support\Factories\PMPro_LevelFactory;
+use PMPro\Test_Support\TestCases\TestCase;
+
+/**
+ * @group pmpro-functions
+ * @group pmpro-levels
+ */
+class HasMembershipLevelTest extends TestCase {
+
+	private $level_id;
+	private $level_id_2;
+
+	private $user_id;
+	private $user_id_2;
+
+	private $level;
+
+	public function setUp() : void {
+		parent::setUp();
+
+		$this->level_id   = $this->factory()->pmpro_level->create();
+		$this->level_id_2 = $this->factory()->pmpro_level->create();
+
+		$this->user_id   = $this->factory()->user->create();
+		$this->user_id_2 = $this->factory()->user->create();
+
+		$this->level = pmpro_getLevel( $this->level_id );
+
+		// Set a valid level.
+		pmpro_changeMembershipLevel( $this->level_id, $this->user_id );
+
+		// Set a valid level, then set status as expired.
+		pmpro_changeMembershipLevel( $this->level_id, $this->user_id_2 );
+
+		global $wpdb;
+
+		$wpdb->update( $wpdb->pmpro_memberships_users, [ 'status' => 'expired' ], [ 'user_id' => $this->user_id_2 ], [ '%s' ], [ '%d' ] );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_false_with_null_levels_and_null_user_id() {
+		$this->assertFalse( pmpro_hasMembershipLevel() );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_false_with_empty_array_levels_and_null_user_id() {
+		$this->assertFalse( pmpro_hasMembershipLevel( [] ) );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_true_with_0_level_id_array_levels_and_null_user_id() {
+		$this->assertTrue( pmpro_hasMembershipLevel( [ 0, $this->level_id ] ) );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_true_with_0_levels_and_null_user_id() {
+		$this->assertTrue( pmpro_hasMembershipLevel( 0 ) );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_true_with_0_string_levels_and_null_user_id() {
+		$this->assertTrue( pmpro_hasMembershipLevel( '0' ) );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_false_with_empty_string_levels_and_null_user_id() {
+		$this->assertFalse( pmpro_hasMembershipLevel( '' ) );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_true_with_negative_one_levels_and_null_user_id() {
+		$this->assertTrue( pmpro_hasMembershipLevel( - 1 ) );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_false_with_negative_one_levels_and_valid_user_id() {
+		$this->assertFalse( pmpro_hasMembershipLevel( - 1, $this->user_id ) );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_true_with_null_levels_and_valid_user_id() {
+		$this->assertTrue( pmpro_hasMembershipLevel( null, $this->user_id ) );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_true_with_valid_levels_and_valid_user_id() {
+		$this->assertTrue( pmpro_hasMembershipLevel( $this->level_id, $this->user_id ) );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_true_with_valid_array_of_two_levels_and_valid_user_id() {
+		$this->assertTrue( pmpro_hasMembershipLevel( [ $this->level_id, $this->level_id_2 ], $this->user_id ) );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_true_with_valid_levels_and_null_user_id_and_valid_current_user() {
+		wp_set_current_user( $this->user_id );
+
+		$this->assertTrue( pmpro_hasMembershipLevel( $this->level_id ) );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_true_with_L_string_levels_and_valid_user_id_and_valid_current_user() {
+		wp_set_current_user( $this->user_id );
+
+		// Test L for logged-in user, it should match current user.
+		$this->assertTrue( pmpro_hasMembershipLevel( 'L', $this->user_id ) );
+		$this->assertTrue( pmpro_hasMembershipLevel( 'l', $this->user_id ) );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_false_with_L_string_levels_and_valid_user_id_and_different_current_user() {
+		wp_set_current_user( $this->user_id_2 );
+
+		// Test L for logged-in user, it should match current user.
+		$this->assertFalse( pmpro_hasMembershipLevel( 'L', $this->user_id ) );
+		$this->assertFalse( pmpro_hasMembershipLevel( 'l', $this->user_id ) );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_false_with_negative_L_string_levels_and_valid_user_id_and_valid_current_user() {
+		wp_set_current_user( $this->user_id );
+
+		// Test -L for non-logged-in user, it should not match current user.
+		$this->assertFalse( pmpro_hasMembershipLevel( '-L', $this->user_id ) );
+		$this->assertFalse( pmpro_hasMembershipLevel( '-l', $this->user_id ) );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_true_with_negative_L_string_levels_and_valid_user_id_and_different_current_user() {
+		wp_set_current_user( $this->user_id_2 );
+
+		// Test -L for non-logged-in user, it should not match current user.
+		$this->assertTrue( pmpro_hasMembershipLevel( '-L', $this->user_id ) );
+		$this->assertTrue( pmpro_hasMembershipLevel( '-l', $this->user_id ) );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_false_with_E_string_levels_and_valid_user_id() {
+		// Test E for expired level.
+		$this->assertFalse( pmpro_hasMembershipLevel( 'E', $this->user_id ) );
+		$this->assertFalse( pmpro_hasMembershipLevel( 'e', $this->user_id ) );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_true_with_E_string_levels_and_expired_user_id() {
+		// Test E for expired level.
+		$this->assertTrue( pmpro_hasMembershipLevel( 'E', $this->user_id_2 ) );
+		$this->assertTrue( pmpro_hasMembershipLevel( 'e', $this->user_id_2 ) );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_true_with_valid_name_string_levels_and_valid_user_id() {
+		$this->assertTrue( pmpro_hasMembershipLevel( $this->level->name, $this->user_id ) );
+	}
+
+	/**
+	 * @covers ::pmpro_hasMembershipLevel()
+	 */
+	public function test_pmpro_hasMembershipLevel_is_false_with_invalid_name_string_levels_and_valid_user_id() {
+		$this->assertFalse( pmpro_hasMembershipLevel( 'Not Level Name', $this->user_id ) );
+	}
+}
\ No newline at end of file