diff --git a/tests/phpunit/api/v3/ContributionTest.php b/tests/phpunit/api/v3/ContributionTest.php
index b13ebe4d61ec..04c212d1f264 100644
--- a/tests/phpunit/api/v3/ContributionTest.php
+++ b/tests/phpunit/api/v3/ContributionTest.php
@@ -1752,9 +1752,9 @@ public function testDeleteEmptyParamsContribution() {
   }
 
   public function testDeleteParamsNotArrayContribution() {
+    $this->expectException(TypeError::class);
     $params = 'contribution_id= 1';
     $contribution = $this->callAPIFailure('contribution', 'delete', $params);
-    $this->assertEquals($contribution['error_message'], 'Input variable `params` is not an array');
   }
 
   public function testDeleteWrongParamContribution() {
diff --git a/tests/phpunit/api/v3/CustomFieldTest.php b/tests/phpunit/api/v3/CustomFieldTest.php
index 7d65df2a74f8..ecb40289f20e 100644
--- a/tests/phpunit/api/v3/CustomFieldTest.php
+++ b/tests/phpunit/api/v3/CustomFieldTest.php
@@ -31,16 +31,6 @@ public function tearDown() {
     parent::tearDown();
   }
 
-  /**
-   * Check with no array.
-   */
-  public function testCustomFieldCreateNoArray() {
-    $fieldParams = NULL;
-
-    $customField = $this->callAPIFailure('custom_field', 'create', $fieldParams);
-    $this->assertEquals($customField['error_message'], 'Input variable `params` is not an array');
-  }
-
   /**
    * Check with no label.
    */
@@ -406,15 +396,6 @@ public function testCustomFieldCreateWithOptionValues() {
 
   ///////////////// civicrm_custom_field_delete methods
 
-  /**
-   * Check with no array.
-   */
-  public function testCustomFieldDeleteNoArray() {
-    $params = NULL;
-    $customField = $this->callAPIFailure('custom_field', 'delete', $params);
-    $this->assertEquals($customField['error_message'], 'Input variable `params` is not an array');
-  }
-
   /**
    * Check without Field ID.
    */
diff --git a/tests/phpunit/api/v3/CustomGroupTest.php b/tests/phpunit/api/v3/CustomGroupTest.php
index 5fd1adc1e64c..e891f28eb079 100644
--- a/tests/phpunit/api/v3/CustomGroupTest.php
+++ b/tests/phpunit/api/v3/CustomGroupTest.php
@@ -199,15 +199,6 @@ public function testCustomGroupCreateNoStyle() {
     $this->assertEquals($customGroup['values'][$customGroup['id']]['style'], 'Inline');
   }
 
-  /**
-   * Check with not array.
-   */
-  public function testCustomGroupCreateNotArray() {
-    $params = NULL;
-    $customGroup = $this->callAPIFailure('custom_group', 'create', $params);
-    $this->assertEquals($customGroup['error_message'], 'Input variable `params` is not an array');
-  }
-
   /**
    * Check without title.
    */
@@ -336,15 +327,6 @@ public function testCustomGroupDeleteWithoutGroupID() {
     $this->assertEquals($customGroup['error_message'], 'Mandatory key(s) missing from params array: id');
   }
 
-  /**
-   * Check with no array.
-   */
-  public function testCustomGroupDeleteNoArray() {
-    $params = NULL;
-    $customGroup = $this->callAPIFailure('custom_group', 'delete', $params);
-    $this->assertEquals($customGroup['error_message'], 'Input variable `params` is not an array');
-  }
-
   /**
    * Check with valid custom group id.
    */
diff --git a/tests/phpunit/api/v3/EventTest.php b/tests/phpunit/api/v3/EventTest.php
index 9dd4b672275e..e547da041fca 100644
--- a/tests/phpunit/api/v3/EventTest.php
+++ b/tests/phpunit/api/v3/EventTest.php
@@ -756,17 +756,6 @@ public function testDeleteWithWrongEventId($version) {
     $result = $this->callAPIFailure('Event', 'Delete', $params);
   }
 
-  /**
-   * Test civicrm_event_search with wrong params type.
-   * @param int $version
-   * @dataProvider versionThreeAndFour
-   */
-  public function testSearchWrongParamsType($version) {
-    $this->_apiversion = $version;
-    $params = 'a string';
-    $result = $this->callAPIFailure('event', 'get', $params);
-  }
-
   /**
    * Test civicrm_event_search with empty params.
    * @param int $version
diff --git a/tests/phpunit/api/v3/GroupOrganizationTest.php b/tests/phpunit/api/v3/GroupOrganizationTest.php
index 4006a5c6ab2f..4ed4ed9f0ca0 100644
--- a/tests/phpunit/api/v3/GroupOrganizationTest.php
+++ b/tests/phpunit/api/v3/GroupOrganizationTest.php
@@ -83,17 +83,6 @@ public function testGroupOrganizationGetWithEmptyParams() {
     $this->assertAPISuccess($result);
   }
 
-  /**
-   * Test civicrm_group_organization_get with wrong params.
-   *
-   * @dataProvider versionThreeAndFour
-   */
-  public function testGroupOrganizationGetWithWrongParams() {
-    $params = 'groupOrg';
-    $result = $this->callAPIFailure('group_organization', 'get', $params);
-    $this->assertEquals($result['error_message'], 'Input variable `params` is not an array');
-  }
-
   /**
    * Test civicrm_group_organization_get invalid keys.
    *
@@ -149,17 +138,6 @@ public function testGroupOrganizationCreateWithEmptyParams() {
     $this->assertEquals($result['error_message'], 'Mandatory key(s) missing from params array: group_id, organization_id');
   }
 
-  /**
-   * Check with invalid params.
-   *
-   * @dataProvider versionThreeAndFour
-   */
-  public function testGroupOrganizationCreateParamsNotArray() {
-    $params = 'group_org';
-    $result = $this->callAPIFailure('group_organization', 'create', $params);
-    $this->assertEquals($result['error_message'], 'Input variable `params` is not an array');
-  }
-
   /**
    * Check with invalid params keys.
    *
@@ -175,17 +153,6 @@ public function testGroupOrganizationCreateWithInvalidKeys() {
 
   ///////////////// civicrm_group_organization_remove methods
 
-  /**
-   * Test civicrm_group_organization_remove with params not an array.
-   *
-   * @dataProvider versionThreeAndFour
-   */
-  public function testGroupOrganizationDeleteParamsNotArray() {
-    $params = 'delete';
-    $result = $this->callAPIFailure('group_organization', 'delete', $params);
-    $this->assertEquals($result['error_message'], 'Input variable `params` is not an array');
-  }
-
   /**
    * Test civicrm_group_organization_remove with empty params.
    *
diff --git a/tests/phpunit/api/v3/JobProcessMailingTest.php b/tests/phpunit/api/v3/JobProcessMailingTest.php
index 68f304629b3b..4334acecb885 100644
--- a/tests/phpunit/api/v3/JobProcessMailingTest.php
+++ b/tests/phpunit/api/v3/JobProcessMailingTest.php
@@ -189,7 +189,8 @@ public function testMailNonProductionRun() {
     ]);
     $this->callAPISuccess('mailing', 'create', $this->_params);
     $this->_mut->assertRecipients([]);
-    $this->callAPIFailure('job', 'process_mailing', "Failure in api call for job process_mailing:  Job has not been executed as it is a non-production environment.");
+    $result = $this->callAPIFailure('job', 'process_mailing', []);
+    $this->assertEquals($result['error_message'], "Job has not been executed as it is a Staging (non-production) environment.");
 
     // Test with runInNonProductionEnvironment param.
     $this->callAPISuccess('job', 'process_mailing', ['runInNonProductionEnvironment' => TRUE]);
diff --git a/tests/phpunit/api/v3/MailingContactTest.php b/tests/phpunit/api/v3/MailingContactTest.php
index 5513438d3cde..0000fcf4fdb4 100644
--- a/tests/phpunit/api/v3/MailingContactTest.php
+++ b/tests/phpunit/api/v3/MailingContactTest.php
@@ -41,20 +41,6 @@ public function tearDown() {
     parent::tearDown();
   }
 
-  /**
-   * Test that the api responds correctly to null params.
-   *
-   * Do not copy and paste.
-   *
-   * Tests like this that test the wrapper belong in the SyntaxConformance class
-   * (which already has a 'not array test)
-   * I have left this here in case 'null' isn't covered in that class
-   * but don't copy it only any other classes
-   */
-  public function testMailingNullParams() {
-    $this->callAPIFailure('MailingContact', 'get', NULL);
-  }
-
   public function testMailingContactGetFields() {
     $result = $this->callAPISuccess('MailingContact', 'getfields', [
       'action' => 'get',
diff --git a/tests/phpunit/api/v3/MembershipPaymentTest.php b/tests/phpunit/api/v3/MembershipPaymentTest.php
index 62512496e26c..8aa94d018db9 100644
--- a/tests/phpunit/api/v3/MembershipPaymentTest.php
+++ b/tests/phpunit/api/v3/MembershipPaymentTest.php
@@ -91,14 +91,6 @@ public function testCreate() {
 
   ///////////////// civicrm_membershipPayment_get methods
 
-  /**
-   * Test civicrm_membershipPayment_get with wrong params type.
-   */
-  public function testGetWrongParamsType() {
-    $params = 'eeee';
-    $GetWrongParamsType = $this->callAPIFailure('membership_payment', 'get', $params, 'Input variable `params` is not an array');
-  }
-
   /**
    * Test civicrm_membershipPayment_get - success expected.
    */
diff --git a/tests/phpunit/api/v3/MembershipTest.php b/tests/phpunit/api/v3/MembershipTest.php
index 1975ef74c1bd..7619412b760a 100644
--- a/tests/phpunit/api/v3/MembershipTest.php
+++ b/tests/phpunit/api/v3/MembershipTest.php
@@ -100,14 +100,6 @@ public function testMembershipDeleteInvalidID() {
     $this->callAPIFailure('membership', 'delete', ['id' => 'blah']);
   }
 
-  /**
-   * Test civicrm_membership_delete() with invalid Membership Id.
-   */
-  public function testMembershipDeleteWithInvalidMembershipId() {
-    $membershipId = 'membership';
-    $this->callAPIFailure('membership', 'delete', $membershipId);
-  }
-
   /**
    * Test membership deletion and with the preserve contribution param.
    */
diff --git a/tests/phpunit/api/v3/ParticipantPaymentTest.php b/tests/phpunit/api/v3/ParticipantPaymentTest.php
index 737a629f2f15..e040c69b8dda 100644
--- a/tests/phpunit/api/v3/ParticipantPaymentTest.php
+++ b/tests/phpunit/api/v3/ParticipantPaymentTest.php
@@ -60,14 +60,6 @@ public function setUp() {
     ]);
   }
 
-  /**
-   * Test civicrm_participant_payment_create with wrong params type.
-   */
-  public function testPaymentCreateWrongParamsType() {
-    $params = 'a string';
-    $this->callAPIFailure('participant_payment', 'create', $params);
-  }
-
   /**
    * Test civicrm_participant_payment_create with empty params.
    */
@@ -130,15 +122,6 @@ public function testPaymentInfoForEvent() {
 
   ///////////////// civicrm_participant_payment_create methods
 
-  /**
-   * Test civicrm_participant payment create with wrong params type.
-   */
-  public function testPaymentUpdateWrongParamsType() {
-    $params = 'a string';
-    $result = $this->callAPIFailure('participant_payment', 'create', $params);
-    $this->assertEquals('Input variable `params` is not an array', $result['error_message']);
-  }
-
   /**
    * Check with empty array.
    */
@@ -268,14 +251,6 @@ public function testPaymentPayLaterOnline() {
     $this->callAPISuccess('participant_payment', 'delete', $params);
   }
 
-  /**
-   * Test civicrm_participant_payment_delete with wrong params type.
-   */
-  public function testPaymentDeleteWrongParamsType() {
-    $params = 'a string';
-    $this->callAPIFailure('participant_payment', 'delete', $params);
-  }
-
   /**
    * Check with empty array.
    */
diff --git a/tests/phpunit/api/v3/ParticipantTest.php b/tests/phpunit/api/v3/ParticipantTest.php
index 1cbfbfb60f14..6c485116b467 100644
--- a/tests/phpunit/api/v3/ParticipantTest.php
+++ b/tests/phpunit/api/v3/ParticipantTest.php
@@ -645,15 +645,6 @@ public function testUpdateCreateParticipantFeeLevelNoSeparator() {
 
   ///////////////// civicrm_participant_update methods
 
-  /**
-   * Test civicrm_participant_update with wrong params type.
-   */
-  public function testUpdateWrongParamsType() {
-    $params = 'a string';
-    $result = $this->callAPIFailure('participant', 'create', $params);
-    $this->assertEquals('Input variable `params` is not an array', $result['error_message']);
-  }
-
   /**
    * Check with empty array.
    */
@@ -720,14 +711,6 @@ public function testUpdateWithWrongContactId() {
 
   ///////////////// civicrm_participant_delete methods
 
-  /**
-   * Test civicrm_participant_delete with wrong params type.
-   */
-  public function testDeleteWrongParamsType() {
-    $params = 'a string';
-    $result = $this->callAPIFailure('participant', 'delete', $params);
-  }
-
   /**
    * Test civicrm_participant_delete with empty params.
    */
diff --git a/tests/phpunit/api/v3/PaymentProcessorTypeTest.php b/tests/phpunit/api/v3/PaymentProcessorTypeTest.php
index 56e2c4942724..9cbd9e5326ab 100644
--- a/tests/phpunit/api/v3/PaymentProcessorTypeTest.php
+++ b/tests/phpunit/api/v3/PaymentProcessorTypeTest.php
@@ -90,13 +90,6 @@ public function testPaymentProcessorTypeDeleteEmpty() {
     $result = $this->callAPIFailure('payment_processor_type', 'delete', $params);
   }
 
-  /**
-   * Check with No array.
-   */
-  public function testPaymentProcessorTypeDeleteParamsNotArray() {
-    $result = $this->callAPIFailure('payment_processor_type', 'delete', 'string');
-  }
-
   /**
    * Check if required fields are not passed.
    */
@@ -141,14 +134,6 @@ public function testPaymentProcessorTypeUpdateEmpty() {
     $this->assertEquals($result['error_message'], 'Mandatory key(s) missing from params array: name, title, class_name, billing_mode');
   }
 
-  /**
-   * Check with No array.
-   */
-  public function testPaymentProcessorTypeUpdateParamsNotArray() {
-    $result = $this->callAPIFailure('payment_processor_type', 'create', 'string');
-    $this->assertEquals($result['error_message'], 'Input variable `params` is not an array');
-  }
-
   /**
    * Check with all parameters.
    */
diff --git a/tests/phpunit/api/v3/RelationshipTypeTest.php b/tests/phpunit/api/v3/RelationshipTypeTest.php
index 08efbece2b2c..b9b4f6706ad9 100644
--- a/tests/phpunit/api/v3/RelationshipTypeTest.php
+++ b/tests/phpunit/api/v3/RelationshipTypeTest.php
@@ -249,17 +249,6 @@ public function testRelationshipTypesGetEmptyParams($version) {
     $this->assertEquals(2, $results['count']);
   }
 
-  /**
-   * Check with params Not Array.
-   * @param int $version
-   * @dataProvider versionThreeAndFour
-   */
-  public function testRelationshipTypesGetParamsNotArray($version) {
-    $this->_apiversion = $version;
-
-    $results = $this->callAPIFailure('relationship_type', 'get', 'string');
-  }
-
   /**
    * Check with valid params array.
    * @param int $version
diff --git a/tests/phpunit/api/v3/SyntaxConformanceTest.php b/tests/phpunit/api/v3/SyntaxConformanceTest.php
index 8d5e4617a394..c32ba6e9e118 100644
--- a/tests/phpunit/api/v3/SyntaxConformanceTest.php
+++ b/tests/phpunit/api/v3/SyntaxConformanceTest.php
@@ -809,21 +809,6 @@ public function testEmptyParam_get($Entity) {
     $this->assertContains("Unknown api version", $result['error_message']);
   }
 
-  /**
-   * @dataProvider entities_get
-   * @param $Entity
-   */
-  public function testEmptyParam_getString($Entity) {
-
-    if (in_array($Entity, $this->toBeImplemented['get'])) {
-      // $this->markTestIncomplete("civicrm_api3_{$Entity}_get to be implemented");
-      return;
-    }
-    $result = $this->callAPIFailure($Entity, 'Get', 'string');
-    $this->assertEquals(2000, $result['error_code']);
-    $this->assertEquals('Input variable `params` is not an array', $result['error_message']);
-  }
-
   /**
    * @dataProvider entities_get
    * @Xdepends testEmptyParam_get // no need to test the simple if the empty doesn't work/is skipped. doesn't seem to work
@@ -1317,15 +1302,6 @@ public function testInvalidID_create($Entity) {
     $result = $this->callAPIFailure($Entity, 'Create', ['id' => 999]);
   }
 
-  /**
-   * @dataProvider entities
-   */
-  public function testCreateWrongTypeParamTag_create() {
-    $result = civicrm_api("Tag", 'Create', 'this is not a string');
-    $this->assertEquals(1, $result['is_error']);
-    $this->assertEquals("Input variable `params` is not an array", $result['error_message']);
-  }
-
   /**
    * @dataProvider entities_updatesingle
    *
@@ -1591,15 +1567,6 @@ public function testInvalidID_delete($Entity) {
     $result = $this->callAPIFailure($Entity, 'Delete', ['id' => 999999]);
   }
 
-  /**
-   * @dataProvider entities
-   */
-  public function testDeleteWrongTypeParamTag_delete() {
-    $result = civicrm_api("Tag", 'Delete', 'this is not a string');
-    $this->assertEquals(1, $result['is_error']);
-    $this->assertEquals("Input variable `params` is not an array", $result['error_message']);
-  }
-
   /**
    * Create two entities and make sure delete action only deletes one!
    *
diff --git a/tests/phpunit/api/v3/UFJoinTest.php b/tests/phpunit/api/v3/UFJoinTest.php
index eefe2b51d2a7..71f04a1bd1b6 100644
--- a/tests/phpunit/api/v3/UFJoinTest.php
+++ b/tests/phpunit/api/v3/UFJoinTest.php
@@ -81,17 +81,6 @@ public function testFindUFGroupId($version) {
     }
   }
 
-  /**
-   * @param int $version
-   * @dataProvider versionThreeAndFour
-   */
-  public function testUFJoinEditWrongParamsType($version) {
-    $this->_apiversion = $version;
-    $params = 'a string';
-    $result = $this->callAPIFailure('uf_join', 'create', $params);
-    $this->assertEquals($result['error_message'], 'Input variable `params` is not an array');
-  }
-
   /**
    * @param int $version
    * @dataProvider versionThreeAndFour
diff --git a/tests/phpunit/api/v3/UFMatchTest.php b/tests/phpunit/api/v3/UFMatchTest.php
index 9808dc8c96d8..2e1d50901ea1 100644
--- a/tests/phpunit/api/v3/UFMatchTest.php
+++ b/tests/phpunit/api/v3/UFMatchTest.php
@@ -75,16 +75,6 @@ public function testGetUFMatchID($version) {
     $this->assertEquals($result['values'][$result['id']]['contact_id'], 69);
   }
 
-  /**
-   * @param int $version
-   * @dataProvider versionThreeAndFour
-   */
-  public function testGetUFMatchIDWrongParam($version) {
-    $this->_apiversion = $version;
-    $params = 'a string';
-    $result = $this->callAPIFailure('uf_match', 'get', $params);
-  }
-
   /**
    * Fetch uf id by contact id.
    * @param int $version
@@ -99,16 +89,6 @@ public function testGetUFID($version) {
     $this->assertEquals($result['values'][$result['id']]['uf_id'], 42);
   }
 
-  /**
-   * @param int $version
-   * @dataProvider versionThreeAndFour
-   */
-  public function testGetUFIDWrongParam($version) {
-    $this->_apiversion = $version;
-    $params = 'a string';
-    $result = $this->callAPIFailure('uf_match', 'get', $params);
-  }
-
   /**
    * Test civicrm_activity_create() using example code
    * @param int $version