Fix MissingFieldException duplication (#2213)

Fixes #2212

1 files changed, 40 insertions, 0 deletions

diff --git a/formats/json-tests/jvmTest/src/kotlinx/serialization/json/MissingFieldExceptionWithPathTest.kt b/formats/json-tests/jvmTest/src/kotlinx/serialization/json/MissingFieldExceptionWithPathTest.kt
new file mode 100644
index 00000000..e56f173e
--- /dev/null
+++ b/formats/json-tests/jvmTest/src/kotlinx/serialization/json/MissingFieldExceptionWithPathTest.kt
@@ -0,0 +1,40 @@
+package kotlinx.serialization.json
+
+import kotlinx.serialization.*
+import kotlinx.serialization.json.Json.Default.decodeFromString
+import org.junit.*
+import org.junit.Test
+import java.io.ByteArrayInputStream
+import java.io.ByteArrayOutputStream
+import java.io.PrintWriter
+import java.io.StringWriter
+import kotlin.test.*
+
+class MissingFieldExceptionWithPathTest {
+
+    @Test // Repro for #2212
+    fun testMfeIsNotReappliedMultipleTimes() {
+        val inputMalformed = """{"title": "...","cast": [{}]"""
+        try {
+            Json.decodeFromString<Movie>(inputMalformed)
+            fail("Unreacheable state")
+        } catch (e: MissingFieldException) {
+            val fullStackTrace = e.stackTraceToString()
+            val i1 = fullStackTrace.toString().indexOf("at path")
+            val i2 = fullStackTrace.toString().lastIndexOf("at path")
+            assertEquals(i1, i2)
+            assertTrue(i1 != -1)
+        }
+    }
+
+    @Serializable
+    data class Movie(
+        val title: String,
+        val cast: List<Cast>,
+    )
+
+    @Serializable
+    data class Cast(
+        val name: String
+    )
+}