Add tests for RESPRenderableHelpers (#114)

Author: adam-fowler

Tests/ValkeyTests/RESPTokenRenderableTests.swift

@@ -0,0 +1,64 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the valkey-swift open source project
+//
+// Copyright (c) 2025 the valkey-swift project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of valkey-swift project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+import NIOCore
+import Testing
+
+@testable import Valkey
+
+struct RESPTokenRenderableTests {
+    @Test
+    func testRESPPureToken() async throws {
+        var commandEncoder = ValkeyCommandEncoder()
+        RESPPureToken("TEST", false).encode(into: &commandEncoder)
+        #expect(commandEncoder.buffer == ByteBuffer(string: ""))
+
+        commandEncoder.reset()
+        RESPPureToken("TEST", true).encode(into: &commandEncoder)
+        #expect(commandEncoder.buffer == RESPToken(.bulkString("TEST")).base)
+    }
+
+    @Test
+    func testRESPWithToken() async throws {
+        var commandEncoder = ValkeyCommandEncoder()
+        var commandEncoder2 = ValkeyCommandEncoder()
+        RESPWithToken("TEST", 5).encode(into: &commandEncoder)
+        "TEST".encode(into: &commandEncoder2)
+        5.encode(into: &commandEncoder2)
+        #expect(commandEncoder.buffer == commandEncoder2.buffer)
+
+        commandEncoder.reset()
+        RESPWithToken("TEST", Int?(nil)).encode(into: &commandEncoder)
+        #expect(commandEncoder.buffer.readableBytes == 0)
+        RESPWithToken("TEST", [Int]()).encode(into: &commandEncoder)
+        #expect(commandEncoder.buffer.readableBytes == 0)
+    }
+
+    @Test
+    func testRESPArrayWithCount() async throws {
+        var commandEncoder = ValkeyCommandEncoder()
+        var commandEncoder2 = ValkeyCommandEncoder()
+        RESPArrayWithCount(["john", "jane"]).encode(into: &commandEncoder)
+        2.encode(into: &commandEncoder2)
+        "john".encode(into: &commandEncoder2)
+        "jane".encode(into: &commandEncoder2)
+        #expect(commandEncoder.buffer == commandEncoder2.buffer)
+
+        commandEncoder.reset()
+        commandEncoder2.reset()
+        RESPArrayWithCount([String]()).encode(into: &commandEncoder)
+        0.encode(into: &commandEncoder2)
+        #expect(commandEncoder.buffer == commandEncoder2.buffer)
+    }
+}