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libraries/ArduinoJson/extras/tests/JsonArray/clear.cpp

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+// ArduinoJson - https://arduinojson.org
+// Copyright © 2014-2025, Benoit BLANCHON
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+#include "Allocators.hpp"
+
+TEST_CASE("JsonArray::clear()") {
+  SECTION("No-op on null JsonArray") {
+    JsonArray array;
+    array.clear();
+    REQUIRE(array.isNull() == true);
+    REQUIRE(array.size() == 0);
+  }
+
+  SECTION("Removes all elements") {
+    JsonDocument doc;
+    JsonArray array = doc.to<JsonArray>();
+    array.add(1);
+    array.add(2);
+    array.clear();
+    REQUIRE(array.size() == 0);
+    REQUIRE(array.isNull() == false);
+  }
+
+  SECTION("Removed elements are recycled") {
+    SpyingAllocator spy;
+    JsonDocument doc(&spy);
+    JsonArray array = doc.to<JsonArray>();
+
+    // fill the pool entirely
+    for (int i = 0; i < ARDUINOJSON_POOL_CAPACITY; i++)
+      array.add(i);
+
+    // clear and fill again
+    array.clear();
+    for (int i = 0; i < ARDUINOJSON_POOL_CAPACITY; i++)
+      array.add(i);
+
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                         });
+  }
+}