Bring back ProtosTest.kt

Author: Mr3zee

grpc/grpc-core/src/commonTest/kotlin/kotlinx/rpc/grpc/pb/ProtosTest.kt

@@ -1,3 +1,71 @@
 /*
  * Copyright 2023-2025 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
  */
+
+package kotlinx.rpc.grpc.pb
+
+import kotlinx.io.Buffer
+import kotlinx.rpc.grpc.test.common.*
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class ProtosTest {
+
+    private fun <T : Any> decodeEncode(
+        msg: T,
+        enc: T.(WireEncoder) -> Unit,
+        dec: (WireDecoder) -> T?
+    ): T? {
+        val buffer = Buffer()
+        val encoder = WireEncoder(buffer)
+
+        msg.enc(encoder)
+        encoder.flush()
+
+        return WireDecoder(buffer).use {
+            dec(it)
+        }
+    }
+
+
+    @Test
+    fun testAllPrimitiveProto() {
+        val msg = AllPrimitivesCommon {
+            int32 = 12
+            int64 = 1234567890123456789L
+            uint32 = 12345u
+            uint64 = 1234567890123456789uL
+            sint32 = -12
+            sint64 = -1234567890123456789L
+            fixed32 = 12345u
+            fixed64 = 1234567890123456789uL
+            sfixed32 = -12345
+            sfixed64 = -1234567890123456789L
+            bool = true
+            float = 1.0f
+            double = 3.0
+            string = "test"
+            bytes = byteArrayOf(1, 2, 3)
+        }
+
+        val decoded = decodeEncode(msg, { encodeWith(it) }, AllPrimitivesCommon::decodeWith)
+
+        assertEquals(msg.double, decoded?.double)
+    }
+
+    @Test
+    fun testRepeatedProto() {
+        val msg = RepeatedCommon {
+            listFixed32 = listOf(1, 2, 3).map { it.toUInt() }
+            listInt32 = listOf(4, 5, 6)
+            listString = listOf("a", "b", "c")
+        }
+
+        val decoded = decodeEncode(msg, { encodeWith(it) }, RepeatedCommon::decodeWith)
+
+        assertEquals(msg.listInt32, decoded?.listInt32)
+        assertEquals(msg.listFixed32, decoded?.listFixed32)
+        assertEquals(msg.listString, decoded?.listString)
+    }
+
+}