TestConsole provides a testable interface for programs interacting with the
console by modeling input and output as reading from and writing to input and
output buffers maintained by TestConsole and backed by a Ref.
All calls to print and printLine using the TestConsole will write the
string to the output buffer and all calls to readLine will take a string
from the input buffer. To facilitate debugging, by default output will also
be rendered to standard output. You can enable or disable this for a scope
using debug, silent, or the corresponding test aspects.
TestConsole has several methods to access and manipulate the content of
these buffers including feedLines to feed strings to the input buffer that
will then be returned by calls to readLine, output to get the content of
the output buffer from calls to print and printLine, and clearInput and
clearOutput to clear the respective buffers.
Together, these functions make it easy to test programs interacting with the console.
import zio.Console._
import zio.test.TestConsole
import zio.ZIO
val sayHello = for {
name <- readLine
_ <- printLine("Hello, " + name + "!")
} yield ()
for {
_ <- TestConsole.feedLines("John", "Jane", "Sally")
_ <- ZIO.collectAll(List.fill(3)(sayHello))
result <- TestConsole.output
} yield result == Vector("Hello, John!\n", "Hello, Jane!\n", "Hello, Sally!\n")
- Companion:
- object