1 files changed, 69 insertions, 0 deletions
diff --git a/formats/json-tests/commonTest/src/kotlinx/serialization/TuplesTest.kt b/formats/json-tests/commonTest/src/kotlinx/serialization/TuplesTest.kt
new file mode 100644
index 00000000..9fd2d5ea
--- /dev/null
+++ b/formats/json-tests/commonTest/src/kotlinx/serialization/TuplesTest.kt
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2017-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package kotlinx.serialization
+
+import kotlinx.serialization.builtins.*
+import kotlinx.serialization.descriptors.*
+import kotlinx.serialization.json.*
+import kotlinx.serialization.test.assertStringFormAndRestored
+import kotlin.test.*
+
+class TuplesTest : JsonTestBase() {
+    @Serializable
+    data class MyPair<K, V>(val k: K, val v: V)
+
+    @Serializable
+    data class PairWrapper(val p: Pair<Int, String>)
+
+    @Serializable
+    data class TripleWrapper(val t: Triple<Int, String, Boolean>)
+
+    @Test
+    fun testCustomPair() = assertStringFormAndRestored(
+        """{"k":42,"v":"foo"}""",
+        MyPair(42, "foo"),
+        MyPair.serializer(
+            Int.serializer(),
+            String.serializer()
+        ),
+        lenient
+    )
+
+    @Test
+    fun testStandardPair() = assertStringFormAndRestored(
+        """{"p":{"first":42,"second":"foo"}}""",
+        PairWrapper(42 to "foo"),
+        PairWrapper.serializer(),
+        lenient
+    )
+
+    @Test
+    fun testStandardPairHasCorrectDescriptor() {
+        val desc = PairWrapper.serializer().descriptor.getElementDescriptor(0)
+        assertEquals(desc.serialName, "kotlin.Pair")
+        assertEquals(
+            desc.elementDescriptors.map(SerialDescriptor::kind),
+            listOf(PrimitiveKind.INT, PrimitiveKind.STRING)
+        )
+    }
+
+    @Test
+    fun testStandardTriple() = assertStringFormAndRestored(
+        """{"t":{"first":42,"second":"foo","third":false}}""",
+        TripleWrapper(Triple(42, "foo", false)),
+        TripleWrapper.serializer(),
+        lenient
+    )
+
+    @Test
+    fun testStandardTripleHasCorrectDescriptor() {
+        val desc = TripleWrapper.serializer().descriptor.getElementDescriptor(0)
+        assertEquals(desc.serialName, "kotlin.Triple")
+        assertEquals(
+            desc.elementDescriptors.map(SerialDescriptor::kind),
+            listOf(PrimitiveKind.INT, PrimitiveKind.STRING, PrimitiveKind.BOOLEAN)
+        )
+    }
+}