sergio-sastre

fun String?.reversed() : String? = this //forgot to reverse it?

@Label("Reversing a reversed String returns the original")
@Property
fun reverseStringTest(@ForAll originalString: String?) {
    assertTrue(
       originalString?.reversed()?.reversed() == originalString
    )
}

sergio-sastre

@Label("If password without upper case chars," +
       "the error message contains 'no upper case letters'"
)
@Property(seed = "-7293214509268013126")
fun testPasswordValidatorRight(@ForAll("noUpperCase") password: String?) {
     collectPasswordStats(password)

     val actualError = passwordValidator.validate(password)
     Truth.assertThat(actualError).contains("no upper case letters")
}

sergio-sastre

@Label("If password without upper case chars," +
       "the error message contains 'no upper case letters'"
)
@Property
fun testPasswordValidatorRight(@ForAll("noUpperCase") password: String?) {
     collectPasswordStats(password)

     val actualError = passwordValidator.validate(password)
     Truth.assertThat(actualError).contains("no upper case letters")
}

sergio-sastre

fun statsUpperCase(password: String?){
    val withUpperCase = password?.contains("[A-Z]".toRegex())
    Statistics
        .label("Upper case")
        .collect(if (withUpperCase == true) "with upper case" else "without upper case")
}
...

fun collectPasswordStats(password: String?){
    statsUpperCase(password)

sergio-sastre

@Provide
fun noUpperCase(): Arbitrary<String> =
    Arbitraries.strings().ascii().filter { it.matches("[^A-Z]".toRegex()) }

sergio-sastre

android {
    ...
    testOptions {
        unitTests.all {
             useJUnitPlatform {
                  //this config supports Jqwik, Junit4 and Junit5
                  includeEngines 'jqwik', 'junit-jupiter', 'junit-vintage'
             }
             include '**/*Properties.class'
             include '**/*Test.class'

sergio-sastre

class ContainsUpperCaseLetterValidator : RequirementValidator {
    override val keywordOnError: String? = "no upper case letters"

    override fun isValid(password: String?): Boolean =
        password?.contains("[a-z]".toRegex()) == true
}

sergio-sastre

val passwordValidator = PasswordValidator(
     ContainsUpperCaseLetterValidator(),
     MinCharsValidator(6),
     ContainsDigitValidator(),
     ContainsLowerCaseLetterValidator(),
     NoBlanksValidator()
 )

@DisplayName("PasswordValidator for invalid passwords")
@ParameterizedTest(name = "When password is \"{0}\", the error contains \"{1}\"")

sergio-sastre

import android.content.Context
import android.text.SpannedString
import android.text.TextUtils
import androidx.annotation.PluralsRes
import androidx.annotation.StringRes
import androidx.core.text.HtmlCompat

fun Context.getStyledText(
    @StringRes id: Int,
    vararg args: Any