1 files changed, 55 insertions, 0 deletions
diff --git a/formats/json-tests/commonTest/src/kotlinx/serialization/json/SpecialFloatingPointValuesTest.kt b/formats/json-tests/commonTest/src/kotlinx/serialization/json/SpecialFloatingPointValuesTest.kt
new file mode 100644
index 00000000..fad07e62
--- /dev/null
+++ b/formats/json-tests/commonTest/src/kotlinx/serialization/json/SpecialFloatingPointValuesTest.kt
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2017-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package kotlinx.serialization.json
+
+import kotlinx.serialization.*
+import kotlinx.serialization.json.internal.*
+import kotlinx.serialization.test.*
+import kotlin.test.*
+
+class SpecialFloatingPointValuesTest : JsonTestBase() {
+
+    @Serializable
+    data class Box(val d: Double, val f: Float) {
+        override fun equals(other: Any?): Boolean {
+            if (this === other) return true
+            if (other == null || this::class != other::class) return false
+            other as Box
+            if (d != other.d && !(d.isNaN() && other.d.isNaN())) return false
+            if (f != other.f && !(f.isNaN() && other.f.isNaN())) return false
+            return true
+        }
+
+        override fun hashCode(): Int {
+            var result = d.hashCode()
+            result = 31 * result + f.hashCode()
+            return result
+        }
+    }
+
+    val json = Json { allowSpecialFloatingPointValues = true }
+
+    @Test
+    fun testNans() = parametrizedTest {
+        test(Box(Double.NaN, Float.NaN), """{"d":NaN,"f":NaN}""", it)
+        noJs { // Number formatting
+            test(Box(0.0, Float.NaN), """{"d":0.0,"f":NaN}""", it)
+            test(Box(Double.NaN, 0.0f), """{"d":NaN,"f":0.0}""", it)
+        }
+    }
+
+    @Test
+    fun testInfinities() = parametrizedTest {
+        test(Box(Double.NEGATIVE_INFINITY, Float.POSITIVE_INFINITY), """{"d":-Infinity,"f":Infinity}""", it)
+        test(Box(Double.POSITIVE_INFINITY, Float.NEGATIVE_INFINITY), """{"d":Infinity,"f":-Infinity}""", it)
+    }
+
+    private fun test(box: Box, expected: String, jsonTestingMode: JsonTestingMode) {
+        assertFailsWithSerialMessage("JsonEncodingException", "Unexpected special floating-point value") { default.encodeToString(Box.serializer(), box, jsonTestingMode) }
+        assertEquals(expected, json.encodeToString(Box.serializer(), box, jsonTestingMode))
+        assertEquals(box, json.decodeFromString(Box.serializer(), expected, jsonTestingMode))
+        assertFailsWithSerialMessage("JsonDecodingException", "Unexpected special floating-point value") { default.decodeFromString(Box.serializer(), expected, jsonTestingMode) }
+    }
+}