1 files changed, 147 insertions, 0 deletions
diff --git a/formats/json-tests/commonTest/src/kotlinx/serialization/json/JsonBuildersTest.kt b/formats/json-tests/commonTest/src/kotlinx/serialization/json/JsonBuildersTest.kt
new file mode 100644
index 00000000..c2dab089
--- /dev/null
+++ b/formats/json-tests/commonTest/src/kotlinx/serialization/json/JsonBuildersTest.kt
@@ -0,0 +1,147 @@
+/*
+ * 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 kotlin.test.*
+
+class JsonBuildersTest {
+
+    @Test
+    fun testBuildJson() {
+        val json = buildJsonObject {
+            putJsonObject("object") {
+                put("k", JsonPrimitive("v"))
+            }
+
+            putJsonArray("array") {
+                addJsonObject { put("nestedLiteral", true) }
+            }
+
+            val number: Number? = null
+            put("null", number)
+            put("primitive", JsonPrimitive(42))
+            put("boolean", true)
+            put("literal", "foo")
+            put("null2", null)
+        }
+        assertEquals("""{"object":{"k":"v"},"array":[{"nestedLiteral":true}],"null":null,"primitive":42,"boolean":true,"literal":"foo","null2":null}""", json.toString())
+    }
+
+    @Test
+    fun testBuildJsonArray() {
+        val json = buildJsonArray {
+            add(true)
+            addJsonArray {
+                for (i in 1..10) add(i)
+            }
+            add(null)
+            addJsonObject {
+                put("stringKey", "stringValue")
+            }
+        }
+        assertEquals("""[true,[1,2,3,4,5,6,7,8,9,10],null,{"stringKey":"stringValue"}]""", json.toString())
+    }
+
+    @Test
+    fun testBuildJsonArrayAddAll() {
+        assertEquals(
+            """[1,2,3,4,5,null]""",
+            buildJsonArray {
+                assertTrue { addAll(listOf(1, 2, 3, 4, 5, null)) }
+            }.toString()
+        )
+
+        assertEquals(
+            """["a","b","c",null]""",
+            buildJsonArray {
+                assertTrue { addAll(listOf("a", "b", "c", null)) }
+            }.toString()
+        )
+
+        assertEquals(
+            """[true,false,null]""",
+            buildJsonArray {
+                assertTrue { addAll(listOf(true, false, null)) }
+            }.toString()
+        )
+
+        assertEquals(
+            """[2,"b",true,null]""",
+            buildJsonArray {
+                assertTrue {
+                    addAll(
+                        listOf(
+                            JsonPrimitive(2),
+                            JsonPrimitive("b"),
+                            JsonPrimitive(true),
+                            JsonNull,
+                        )
+                    )
+                }
+            }.toString()
+        )
+
+        assertEquals(
+            """[{},{},{},null]""",
+            buildJsonArray {
+                assertTrue {
+                    addAll(
+                        listOf(
+                            JsonObject(emptyMap()),
+                            JsonObject(emptyMap()),
+                            JsonObject(emptyMap()),
+                            JsonNull
+                        )
+                    )
+                }
+            }.toString()
+        )
+
+        assertEquals(
+            """[[],[],[],null]""",
+            buildJsonArray {
+                assertTrue {
+                    addAll(
+                        listOf(
+                            JsonArray(emptyList()),
+                            JsonArray(emptyList()),
+                            JsonArray(emptyList()),
+                            JsonNull
+                        )
+                    )
+                }
+            }.toString()
+        )
+
+        assertEquals(
+            """[null,null]""",
+            buildJsonArray {
+                assertTrue {
+                    addAll(listOf(JsonNull, JsonNull))
+                }
+            }.toString()
+        )
+    }
+
+    @Test
+    fun testBuildJsonArrayAddAllNotModified() {
+        assertEquals(
+            """[]""",
+            buildJsonArray {
+                // add collections
+                assertFalse { addAll(listOf<Number>()) }
+                assertFalse { addAll(listOf<String>()) }
+                assertFalse { addAll(listOf<Boolean>()) }
+
+                // add json elements
+                assertFalse { addAll(listOf()) }
+                assertFalse { addAll(listOf<JsonNull>()) }
+                assertFalse { addAll(listOf<JsonObject>()) }
+                assertFalse { addAll(listOf<JsonArray>()) }
+                assertFalse { addAll(listOf<JsonPrimitive>()) }
+            }.toString()
+        )
+    }
+}