1 files changed, 52 insertions, 0 deletions
diff --git a/runtime/jvmTest/src/kotlinx/serialization/JavaCollectionsTest.kt b/runtime/jvmTest/src/kotlinx/serialization/JavaCollectionsTest.kt
new file mode 100644
index 00000000..e3ef6226
--- /dev/null
+++ b/runtime/jvmTest/src/kotlinx/serialization/JavaCollectionsTest.kt
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2019 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kotlinx.serialization
+
+import kotlinx.serialization.json.Json
+import org.junit.Test
+import java.util.HashMap
+import java.util.HashSet
+import kotlin.collections.LinkedHashMap
+import kotlin.collections.Map
+import kotlin.collections.hashMapOf
+import kotlin.collections.hashSetOf
+import kotlin.test.assertEquals
+
+
+class JavaCollectionsTest {
+    @Serializable
+    data class HasHashMap(
+        val s: String,
+        val hashMap: HashMap<Int, String>,
+        val hashSet: HashSet<Int>,
+        val linkedHashMap: LinkedHashMap<Int, String>,
+        val kEntry: Map.Entry<Int, String>?
+    )
+
+    @Test
+    fun test() {
+        val original = HasHashMap("42", hashMapOf(1 to "1", 2 to "2"), hashSetOf(11), LinkedHashMap(), null)
+        val serializer = HasHashMap.serializer()
+        val string = Json.plain.stringify(serializer = serializer, obj = original)
+        assertEquals(
+            expected = """{"s":"42","hashMap":{"1":"1","2":"2"},"hashSet":[11],"linkedHashMap":{},"kEntry":null}""",
+            actual = string
+        )
+        val restored = Json.plain.parse(deserializer = serializer, string = string)
+        assertEquals(expected = original, actual = restored)
+    }
+}