PHPLIB-1347 Add tests on Conditional Expression Operators (#30)

Author: GromNaN

generator/config/expression/cond.yaml

@@ -19,3 +19,19 @@ arguments:
         name: else
         type:
             - expression
+tests:
+    -
+        name: 'Example'
+        link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/cond/#example'
+        pipeline:
+            -
+                $project:
+                    item: 1
+                    discount:
+                        $cond:
+                            if:
+                                $gte:
+                                    - '$qty'
+                                    - 250
+                            then: 30
+                            else: 20

generator/config/expression/ifNull.yaml

@@ -12,3 +12,27 @@ arguments:
         type:
             - expression
         variadic: array
+tests:
+    -
+        name: 'Single Input Expression'
+        link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/ifNull/#single-input-expression'
+        pipeline:
+            -
+                $project:
+                    item: 1
+                    description:
+                        $ifNull:
+                            - '$description'
+                            - 'Unspecified'
+    -
+        name: 'Multiple Input Expressions'
+        link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/ifNull/#multiple-input-expressions'
+        pipeline:
+            -
+                $project:
+                    item: 1
+                    value:
+                        $ifNull:
+                            - '$description'
+                            - '$quantity'
+                            - 'Unspecified'

generator/config/expression/switch.yaml

@@ -24,3 +24,47 @@ arguments:
         description: |
             The path to take if no branch case expression evaluates to true.
             Although optional, if default is unspecified and no branch case evaluates to true, $switch returns an error.
+tests:
+    -
+        name: 'Example'
+        link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/switch/#example'
+        pipeline:
+            -
+                $project:
+                    name: 1
+                    summary:
+                        $switch:
+                            branches:
+                                -
+                                    case:
+                                        $gte:
+                                            -
+                                                #$avg: '$scores'
+                                                $avg: [ '$scores' ]
+                                            - 90
+                                    then: 'Doing great!'
+                                -
+                                    case:
+                                        $and:
+                                            -
+                                                $gte:
+                                                    -
+                                                        #$avg: '$scores'
+                                                        $avg: [ '$scores' ]
+                                                    - 80
+                                            -
+                                                $lt:
+                                                    -
+                                                        #$avg: '$scores'
+                                                        $avg: [ '$scores' ]
+                                                    - 90
+                                    then: 'Doing pretty well.'
+                                -
+                                    case:
+                                        $lt:
+                                            -
+                                                #$avg: '$scores'
+                                                $avg: [ '$scores' ]
+                                            - 80
+                                    then: 'Needs improvement.'
+                            default: 'No scores found.'

tests/Builder/Expression/CondOperatorTest.php

@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MongoDB\Tests\Builder\Expression;
+
+use MongoDB\Builder\Expression;
+use MongoDB\Builder\Pipeline;
+use MongoDB\Builder\Stage;
+use MongoDB\Tests\Builder\PipelineTestCase;
+
+/**
+ * Test $cond expression
+ */
+class CondOperatorTest extends PipelineTestCase
+{
+    public function testExample(): void
+    {
+        $pipeline = new Pipeline(
+            Stage::project(
+                item: 1,
+                discount: Expression::cond(
+                    if: Expression::gte(
+                        Expression::intFieldPath('qty'),
+                        250,
+                    ),
+                    then: 30,
+                    else: 20,
+                ),
+            ),
+        );
+
+        $this->assertSamePipeline(Pipelines::CondExample, $pipeline);
+    }
+}

tests/Builder/Expression/IfNullOperatorTest.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MongoDB\Tests\Builder\Expression;
+
+use MongoDB\Builder\Expression;
+use MongoDB\Builder\Pipeline;
+use MongoDB\Builder\Stage;
+use MongoDB\Tests\Builder\PipelineTestCase;
+
+/**
+ * Test $ifNull expression
+ */
+class IfNullOperatorTest extends PipelineTestCase
+{
+    public function testMultipleInputExpressions(): void
+    {
+        $pipeline = new Pipeline(
+            Stage::project(
+                item: 1,
+                value: Expression::ifNull(
+                    Expression::fieldPath('description'),
+                    Expression::fieldPath('quantity'),
+                    'Unspecified',
+                ),
+            ),
+        );
+
+        $this->assertSamePipeline(Pipelines::IfNullMultipleInputExpressions, $pipeline);
+    }
+
+    public function testSingleInputExpression(): void
+    {
+        $pipeline = new Pipeline(
+            Stage::project(
+                item: 1,
+                description: Expression::ifNull(
+                    Expression::fieldPath('description'),
+                    'Unspecified',
+                ),
+            ),
+        );
+
+        $this->assertSamePipeline(Pipelines::IfNullSingleInputExpression, $pipeline);
+    }
+}