Fixed decoding of huge JSON data for okio streams

Fixes #2006

Co-authored-by: Leonid Startsev <sandwwraith@users.noreply.github.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/formats/json-tests/commonTest/src/kotlinx/serialization/json/JsonHugeDataSerializationTest.kt b/formats/json-tests/commonTest/src/kotlinx/serialization/json/JsonHugeDataSerializationTest.kt
new file mode 100644
index 00000000..0a633268
--- /dev/null
+++ b/formats/json-tests/commonTest/src/kotlinx/serialization/json/JsonHugeDataSerializationTest.kt
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2017-2022 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package kotlinx.serialization.json
+
+import kotlinx.serialization.Serializable
+import kotlin.test.Test
+
+class JsonHugeDataSerializationTest : JsonTestBase() {
+
+    @Serializable
+    private data class Node(
+        val children: List<Node>
+    )
+
+    private fun createNodes(count: Int, depth: Int): List<Node> {
+        val ret = mutableListOf<Node>()
+        if (depth == 0) return ret
+        for (i in 0 until count) {
+            ret.add(Node(createNodes(1, depth - 1)))
+        }
+        return ret
+    }
+
+    @Test
+    fun test() {
+        // create some huge instance
+        val rootNode = Node(createNodes(1000, 10))
+
+        val expectedJson = Json.encodeToString(Node.serializer(), rootNode)
+
+        /*
+          The assertJsonFormAndRestored function, when checking the encoding, will call Json.encodeToString(...) for `JsonTestingMode.STREAMING`
+          since the string `expectedJson` was generated by the same function, the test will always consider
+          the encoding to the `STREAMING` mode is correct, even if there was actually an error there. So only TREE, JAVA_STREAMS and OKIO are actually being tested here
+         */
+        assertJsonFormAndRestored(Node.serializer(), rootNode, expectedJson)
+    }
+}