Add redirect on response

src/main/kotlin/daikon/HttpResponse.kt

@@ -14,6 +14,11 @@ class HttpResponse(private val response: HttpServletResponse) : Response {
         return writer.toString()
     }
 
+    override fun redirect(path: String, status: Int) {
+        status(status)
+        header("Location", path)
+    }
+
     override fun content(type: String) {
        response.contentType = type
     }

src/main/kotlin/daikon/Response.kt

@@ -1,9 +1,12 @@
 package daikon
 
+import org.eclipse.jetty.http.HttpStatus.MOVED_TEMPORARILY_302
+
 interface Response {
     fun write(text: String)
     fun status(code: Int)
     fun content(type: String)
     fun header(name: String, value: String)
     fun body(): String
+    fun redirect(path: String, status: Int = MOVED_TEMPORARILY_302)
 }

src/test/kotlin/daikon/ResponseTest.kt

@@ -3,16 +3,18 @@ package daikon
 import daikon.Localhost.get
 import daikon.Localhost.post
 import org.assertj.core.api.Assertions.assertThat
+import org.eclipse.jetty.http.HttpStatus.CREATED_201
+import org.eclipse.jetty.http.HttpStatus.MOVED_PERMANENTLY_301
 import org.junit.jupiter.api.Test
 
 class ResponseTest {
 
     @Test
     fun `status code`() {
         HttpServer()
-            .any("/") { _, res -> res.status(201) }
+            .any("/") { _, res -> res.status(CREATED_201) }
             .start().use {
-                assertThat(get("/").statusCode).isEqualTo(201)
+                assertThat(get("/").statusCode).isEqualTo(CREATED_201)
             }
     }
 
@@ -49,4 +51,24 @@ class ResponseTest {
                 assertThat(body).isEqualTo("Hi Bob")
             }
     }
+
+    @Test
+    fun `redirect to relative path`() {
+        HttpServer()
+            .any("/foo") { _, res -> res.redirect("/bar", MOVED_PERMANENTLY_301) }
+            .any("/bar") { _, res -> res.write("Hello") }
+            .start().use {
+                assertThat(get("/foo").text).isEqualTo("Hello")
+            }
+    }
+
+    @Test
+    fun `redirect to absolute path`() {
+        HttpServer()
+            .any("/foo") { _, res -> res.redirect("http://localhost:4545/bar") }
+            .any("/bar") { _, res -> res.write("Hello") }
+            .start().use {
+                assertThat(get("/foo").text).isEqualTo("Hello")
+            }
+    }
 }