From ee12cd4b4df78490bb5d2860608bd2b618fcd92b Mon Sep 17 00:00:00 2001
From: ansestepanov <ansestepanov@yandex-team.com>
Date: Tue, 19 Aug 2025 14:08:42 +0300
Subject: [PATCH] filter function tests
 commit_hash:1549bd01f40360f820353cecb97414026573b7bb

---
 .mapping.json                                 |   1 +
 .../filter_function_array.json                | 301 ++++++++++++++++++
 .../methods_signatures_array.json             |  17 +
 3 files changed, 319 insertions(+)
 create mode 100644 test_data/expression_test_data/filter_function_array.json

diff --git a/.mapping.json b/.mapping.json
index fc6e576e3..f61a24cc0 100644
--- a/.mapping.json
+++ b/.mapping.json
@@ -20390,6 +20390,7 @@
   "site/server/src/runTs.js":"divkit/public/site/server/src/runTs.js",
   "site/server/src/runTsWorker.js":"divkit/public/site/server/src/runTsWorker.js",
   "test_data/expression_test_data/custom_functions.json":"divkit/public/test_data/expression_test_data/custom_functions.json",
+  "test_data/expression_test_data/filter_function_array.json":"divkit/public/test_data/expression_test_data/filter_function_array.json",
   "test_data/expression_test_data/function_signatures_array.json":"divkit/public/test_data/expression_test_data/function_signatures_array.json",
   "test_data/expression_test_data/function_signatures_color.json":"divkit/public/test_data/expression_test_data/function_signatures_color.json",
   "test_data/expression_test_data/function_signatures_datetime.json":"divkit/public/test_data/expression_test_data/function_signatures_datetime.json",
diff --git a/test_data/expression_test_data/filter_function_array.json b/test_data/expression_test_data/filter_function_array.json
new file mode 100644
index 000000000..6b9a63700
--- /dev/null
+++ b/test_data/expression_test_data/filter_function_array.json
@@ -0,0 +1,301 @@
+{
+  "cases": [
+    {
+      "expression": "@{source.filter(equalsOneFromDict)}",
+      "expected": {
+        "type": "array",
+        "value": [
+          {
+            "value": "one"
+          }
+        ]
+      },
+      "variables": [
+        {
+          "name": "source",
+          "type": "array",
+          "value": [
+            {
+              "value": "one"
+            },
+            {
+              "value": "two"
+            },
+            {
+              "value": "three"
+            }
+          ]
+        }
+      ],
+      "functions": [
+        {
+          "name": "equalsOneFromDict",
+          "body": "@{it.getString('value') == 'one'}",
+          "return_type": "boolean",
+          "arguments": [
+            {
+              "name": "it",
+              "type": "dict"
+            }
+          ]
+        }
+      ],
+      "platforms": []
+    },
+    {
+      "expression": "@{source.filter(equalsOne)}",
+      "expected": {
+        "type": "array",
+        "value": [
+          "one"
+        ]
+      },
+      "variables": [
+        {
+          "name": "source",
+          "type": "array",
+          "value": [
+            "one",
+            "two",
+            "three"
+          ]
+        }
+      ],
+      "functions": [
+        {
+          "name": "equalsOne",
+          "body": "@{str == 'one'}",
+          "return_type": "boolean",
+          "arguments": [
+            {
+              "name": "str",
+              "type": "string"
+            }
+          ]
+        }
+      ],
+      "platforms": []
+    },
+    {
+      "expression": "@{source.filter(lessThanThree)}",
+      "expected": {
+        "type": "array",
+        "value": [
+          1,
+          2
+        ]
+      },
+      "variables": [
+        {
+          "name": "source",
+          "type": "array",
+          "value": [
+            1,
+            2,
+            3
+          ]
+        }
+      ],
+      "functions": [
+        {
+          "name": "lessThanThree",
+          "body": "@{num < 3}",
+          "return_type": "boolean",
+          "arguments": [
+            {
+              "name": "num",
+              "type": "integer"
+            }
+          ]
+        }
+      ],
+      "platforms": []
+    },
+    {
+      "expression": "@{source.filter(alwaysFalse)}",
+      "expected": {
+        "type": "array",
+        "value": []
+      },
+      "variables": [
+        {
+          "name": "source",
+          "type": "array",
+          "value": [
+            "one",
+            "two",
+            "three"
+          ]
+        }
+      ],
+      "functions": [
+        {
+          "name": "alwaysFalse",
+          "body": "@{false}",
+          "return_type": "boolean",
+          "arguments": [
+            {
+              "name": "item",
+              "type": "string"
+            }
+          ]
+        }
+      ],
+      "platforms": []
+    },
+    {
+      "expression": "@{boolArray.filter(isTrue)}",
+      "expected": {
+        "type": "array",
+        "value": [
+          true,
+          true
+        ]
+      },
+      "variables": [
+        {
+          "name": "boolArray",
+          "type": "array",
+          "value": [
+            true,
+            false,
+            true,
+            false
+          ]
+        }
+      ],
+      "functions": [
+        {
+          "name": "isTrue",
+          "body": "@{value == true}",
+          "return_type": "boolean",
+          "arguments": [
+            {
+              "name": "value",
+              "type": "boolean"
+            }
+          ]
+        }
+      ],
+      "platforms": []
+    },
+    {
+      "expression": "@{source.filter(nonExistentFunction)}",
+      "expected": {
+        "type": "error",
+        "value": "Failed to evaluate [filter(nonExistentFunction)]. Unknown function name: nonExistentFunction."
+      },
+      "variables": [
+        {
+          "name": "source",
+          "type": "array",
+          "value": [
+            "one",
+            "two"
+          ]
+        }
+      ],
+      "functions": [],
+      "platforms": []
+    },
+    {
+      "expression": "@{source.filter(wrongReturnType)}",
+      "expected": {
+        "type": "error",
+        "value": "Failed to evaluate [filter(wrongReturnType)]. Function must return boolean value."
+      },
+      "variables": [
+        {
+          "name": "source",
+          "type": "array",
+          "value": [
+            "one",
+            "two"
+          ]
+        }
+      ],
+      "functions": [
+        {
+          "name": "wrongReturnType",
+          "body": "@{'not_boolean'}",
+          "return_type": "string",
+          "arguments": [
+            {
+              "name": "item",
+              "type": "string"
+            }
+          ]
+        }
+      ],
+      "platforms": []
+    },
+    {
+      "expression": "@{source.filter(containsQuery)}",
+      "expected": {
+        "type": "error",
+        "value": "Failed to evaluate [containsQuery]. Exactly 2 argument(s) expected."
+      },
+      "variables": [
+        {
+          "name": "source",
+          "type": "array",
+          "value": [
+            "one",
+            "two",
+            "three"
+          ]
+        }
+      ],
+      "functions": [
+        {
+          "name": "containsQuery",
+          "body": "@{contains(it, query)}",
+          "return_type": "boolean",
+          "arguments": [
+            {
+              "name": "it",
+              "type": "string"
+            },
+            {
+              "name": "query",
+              "type": "string"
+            }
+          ]
+        }
+      ],
+      "platforms": []
+    },
+    {
+      "expression": "@{heterogeneousArray.filter(isStringOne)}",
+      "expected": {
+        "type": "error",
+        "value": "Failed to evaluate [filter(isStringOne)]. Incorrect value type: expected String, got Integer."
+      },
+      "variables": [
+        {
+          "name": "heterogeneousArray",
+          "type": "array",
+          "value": [
+            "one",
+            42,
+            true
+          ]
+        }
+      ],
+      "functions": [
+        {
+          "name": "isStringOne",
+          "body": "@{str == 'one'}",
+          "return_type": "boolean",
+          "arguments": [
+            {
+              "name": "str",
+              "type": "string"
+            }
+          ]
+        }
+      ],
+      "platforms": []
+    }
+  ]
+}
diff --git a/test_data/expression_test_data/methods_signatures_array.json b/test_data/expression_test_data/methods_signatures_array.json
index e9da4e944..60efdbc0c 100644
--- a/test_data/expression_test_data/methods_signatures_array.json
+++ b/test_data/expression_test_data/methods_signatures_array.json
@@ -193,6 +193,23 @@
         "web",
         "flutter"
       ]
+    },
+    {
+      "function_name": "filter",
+      "is_method": true,
+      "doc": "Returns filtered array by calling boolean function to each element of array.",
+      "arguments": [
+        {
+          "type": "array",
+          "doc": "Array."
+        },
+        {
+          "type": "function",
+          "doc": "Accepts each element of array, returns bool."
+        }
+      ],
+      "result_type": "array",
+      "platforms": []
     }
   ]
 }