kotlin-result/src/test/kotlin/com/github/michaelbull/result/UnwrapTest.kt

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2017-10-21 23:59:16 +00:00
package com.github.michaelbull.result
import com.natpryce.hamkrest.assertion.assertThat
import com.natpryce.hamkrest.equalTo
import org.junit.jupiter.api.Assertions.assertThrows
import org.junit.jupiter.api.Test
internal class UnwrapTest {
@Test
internal fun `unwrap should return the result value if ok`() {
val value = Ok(5000).unwrap()
assertThat(value, equalTo(5000))
}
@Test
internal fun `unwrap should throw an UnwrapException if not ok`() {
val throwable = assertThrows(UnwrapException::class.java) {
Err(5000).unwrap()
}
assertThat(throwable.message, equalTo("called Result.wrap on an Err value 5000"))
}
@Test
internal fun `expect should return the result value if ok`() {
val value = Ok(1994).expect { "the year should be" }
assertThat(value, equalTo(1994))
}
@Test
internal fun `expect should throw an UnwrapException with a specified message if not ok`() {
val message = object {
override fun toString() = "the year should be"
}
val throwable = assertThrows(UnwrapException::class.java) {
Err(1994).expect { message }
}
assertThat(throwable.message, equalTo("the year should be 1994"))
}
@Test
internal fun `unwrapError should throw an UnwrapException if ok`() {
val throwable = assertThrows(UnwrapException::class.java) {
Ok("example").unwrapError()
}
assertThat(throwable.message, equalTo("called Result.unwrapError on an Ok value example"))
}
@Test
internal fun `unwrapError should return the result error if not ok`() {
val error = Err("example").unwrapError()
assertThat(error, equalTo("example"))
}
@Test
internal fun `expectError should throw an UnwrapException with a specified message if ok`() {
val message = object {
override fun toString() = "the year should be"
}
val throwable = assertThrows(UnwrapException::class.java) {
Ok(2010).expectError { message }
}
assertThat(throwable.message, equalTo("the year should be 2010"))
}
@Test
internal fun `expectError should return the result error if not ok`() {
val error = Err(2010).expectError { "the year should be" }
assertThat(error, equalTo(2010))
}
}