This micro-library lets you use a more concise ZIO assertion syntax for class fields:

import com.timushev.zio.test.macros.Assertion._

assert(book)(hasPath(_.author.name, isNonEmptyString))

Comparing to the default hasField combinator, hasPath does not make you duplicate the field name:

assert(book)(hasField("author.name", _.author.name, isNonEmptyString))

A compiler macro captures the field names for you, so in case of a failure the error message is still informative:

// com.timushev.zio.test.macros.Assertion.hasPath
Book(Writer()) did not satisfy hasPath(_.author.name, isNonEmptyString())

// zio.test.Assertion.hasField
Book(Writer()) did not satisfy hasField("author.name", _.author.name, isNonEmptyString())

The library is cross-built for Scala 2.12 and 2.13, both JVM and Scala.js 1.0 platforms. It is published to Maven Central, so you just need to add the following to your build.sbt:

libraryDependencies += "com.timushev" %% "zio-test-macros"  % "0.1.0"

Macro implementation is inspired by Monocle.