Use case operator throughout tests

Author: alcaeus

tests/Builder/Expression/ConvertOperatorTest.php

@@ -10,8 +10,6 @@
 use MongoDB\Builder\Stage;
 use MongoDB\Tests\Builder\PipelineTestCase;
 
-use function MongoDB\object;
-
 /**
  * Test $convert expression
  */
@@ -43,7 +41,7 @@ public function testExample(): void
             Stage::project(
                 totalPrice: Expression::switch(
                     branches: [
-                        object(
+                        Expression::case(
                             case: Expression::eq(
                                 Expression::type(
                                     Expression::fieldPath('convertedPrice'),
@@ -52,7 +50,7 @@ public function testExample(): void
                             ),
                             then: 'NaN',
                         ),
-                        object(
+                        Expression::case(
                             case: Expression::eq(
                                 Expression::type(
                                     Expression::fieldPath('convertedQty'),

tests/Builder/Expression/IsNumberOperatorTest.php

@@ -10,8 +10,6 @@
 use MongoDB\Builder\Stage;
 use MongoDB\Tests\Builder\PipelineTestCase;
 
-use function MongoDB\object;
-
 /**
  * Test $isNumber expression
  */
@@ -28,35 +26,35 @@ public function testConditionallyModifyFieldsUsingIsNumber(): void
                     then: Expression::fieldPath('grade'),
                     else: Expression::switch(
                         branches: [
-                            object(
+                            Expression::case(
                                 case: Expression::eq(
                                     Expression::fieldPath('grade'),
                                     'A',
                                 ),
                                 then: 4,
                             ),
-                            object(
+                            Expression::case(
                                 case: Expression::eq(
                                     Expression::fieldPath('grade'),
                                     'B',
                                 ),
                                 then: 3,
                             ),
-                            object(
+                            Expression::case(
                                 case: Expression::eq(
                                     Expression::fieldPath('grade'),
                                     'C',
                                 ),
                                 then: 2,
                             ),
-                            object(
+                            Expression::case(
                                 case: Expression::eq(
                                     Expression::fieldPath('grade'),
                                     'D',
                                 ),
                                 then: 1,
                             ),
-                            object(
+                            Expression::case(
                                 case: Expression::eq(
                                     Expression::fieldPath('grade'),
                                     'F',

tests/Builder/Expression/ToBoolOperatorTest.php

@@ -9,8 +9,6 @@
 use MongoDB\Builder\Stage;
 use MongoDB\Tests\Builder\PipelineTestCase;
 
-use function MongoDB\object;
-
 /**
  * Test $toBool expression
  */
@@ -22,14 +20,14 @@ public function testExample(): void
             Stage::addFields(
                 convertedShippedFlag: Expression::switch(
                     branches: [
-                        object(
+                        Expression::case(
                             case: Expression::eq(
                                 Expression::fieldPath('shipped'),
                                 'false',
                             ),
                             then: false,
                         ),
-                        object(
+                        Expression::case(
                             case: Expression::eq(
                                 Expression::fieldPath('shipped'),
                                 '',