1 files changed, 64 insertions, 0 deletions
diff --git a/runtime/commonTest/src/kotlinx/serialization/features/SkipDefaults.kt b/runtime/commonTest/src/kotlinx/serialization/features/SkipDefaults.kt
new file mode 100644
index 00000000..85625024
--- /dev/null
+++ b/runtime/commonTest/src/kotlinx/serialization/features/SkipDefaults.kt
@@ -0,0 +1,64 @@
+/*
+ * Copyright 2018 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.features
+
+import kotlinx.serialization.*
+import kotlinx.serialization.cbor.*
+import kotlinx.serialization.json.*
+import kotlin.test.*
+
+@Serializable
+data class Data(val bar: String, val foo: Int = 42) {
+    var list: List<Int> = emptyList()
+
+    val listWithSomething: List<Int> = listOf(1, 2, 3)
+}
+
+class SkipDefaultsTest {
+    private val json = Json { encodeDefaults = false }
+    private val cbor = Cbor(encodeDefaults = false)
+
+    @Test
+    fun serializeCorrectlyDefaults() {
+        val d = Data("bar")
+        assertEquals("""{"bar":"bar","foo":42,"list":[],"listWithSomething":[1,2,3]}""", Json.stringify(Data.serializer(), d))
+    }
+
+    @Test
+    fun serializeCorrectly() {
+        val d = Data("bar", 100).apply { list = listOf(1, 2, 3) }
+        assertEquals("""{"bar":"bar","foo":100,"list":[1,2,3]}""", json.stringify(Data.serializer(), d))
+    }
+
+    @Test
+    fun serializeCorrectlyAndDropBody() {
+        val d = Data("bar", 43)
+        assertEquals("""{"bar":"bar","foo":43}""", json.stringify(Data.serializer(), d))
+    }
+
+    @Test
+    fun serializeCorrectlyAndDropAll() {
+        val d = Data("bar")
+        assertEquals("""{"bar":"bar"}""", json.stringify(Data.serializer(), d))
+    }
+
+    @Test
+    fun cborDropsDefaults() {
+        val d = Data("bar")
+        assertEquals("bf6362617263626172ff", cbor.dumps(Data.serializer(), d))
+    }
+}