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dataconnect: minor unit test improvements to AlphanumericStringUtilUnitTest.kt #7248

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Aug 12, 2025
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dataconnect: minor unit test improvements to AlphanumericStringUtilUnitTest.kt #7248

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42 changes: 27 additions & 15 deletions ...ogle/firebase/dataconnect/UtilUnitTest.kt → ...ct/util/AlphanumericStringUtilUnitTest.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -14,16 +14,22 @@
* limitations under the License.
*/

package com.google.firebase.dataconnect
package com.google.firebase.dataconnect.util

import com.google.firebase.dataconnect.util.AlphanumericStringUtil.toAlphaNumericString
import io.kotest.matchers.shouldBe
import io.kotest.property.Arb
import io.kotest.property.arbitrary.byte
import io.kotest.property.arbitrary.byteArray
import io.kotest.property.arbitrary.int
import io.kotest.property.checkAll
import kotlinx.coroutines.test.runTest
import org.junit.Test

class UtilUnitTest {
class AlphanumericStringUtilUnitTest {

@Test
fun `ByteArray toAlphaNumericString() interprets the alphabet`() {
fun `toAlphaNumericString() interprets the alphabet`() {
val byteArray =
byteArrayOf(
0,
Expand Down Expand Up @@ -52,13 +58,13 @@ class UtilUnitTest {
}

@Test
fun `ByteArray toAlphaNumericString() where the final 5-bit chunk is 1 bit`() {
fun `toAlphaNumericString() where the final 5-bit chunk is 1 bit`() {
byteArrayOf(75, 50).let { it.toAlphaNumericString() shouldBe "bet2" }
byteArrayOf(75, 51).let { it.toAlphaNumericString() shouldBe "bet3" }
}

@Test
fun `ByteArray toAlphaNumericString() where the final 5-bit chunk is 2 bits`() {
fun `toAlphaNumericString() where the final 5-bit chunk is 2 bits`() {
byteArrayOf(117, -40, -116, -66, -105, -61, 18, -117, -52).let {
it.toAlphaNumericString() shouldBe "greathorsebarn2"
}
Expand All @@ -68,61 +74,61 @@ class UtilUnitTest {
}

@Test
fun `ByteArray toAlphaNumericString() where the final 5-bit chunk is 3 bits`() {
fun `toAlphaNumericString() where the final 5-bit chunk is 3 bits`() {
byteArrayOf(64).let { it.toAlphaNumericString() shouldBe "a2" }
byteArrayOf(71).let { it.toAlphaNumericString() shouldBe "a9" }
}

@Test
fun `ByteArray toAlphaNumericString() where the final 5-bit chunk is 4 bits`() {
fun `toAlphaNumericString() where the final 5-bit chunk is 4 bits`() {
byteArrayOf(-58, 117, 48).let { it.toAlphaNumericString() shouldBe "stun2" }
byteArrayOf(-58, 117, 63).let { it.toAlphaNumericString() shouldBe "stunh" }
}

@Test
fun `ByteArray toAlphaNumericString() on empty byte array`() {
fun `toAlphaNumericString() on empty byte array`() {
val emptyByteArray = byteArrayOf()
emptyByteArray.toAlphaNumericString() shouldBe ""
}

@Test
fun `ByteArray toAlphaNumericString() on byte array with 1 element of value 0`() {
fun `toAlphaNumericString() on byte array with 1 element of value 0`() {
val byteArray = byteArrayOf(0)
byteArray.toAlphaNumericString() shouldBe "22"
}

@Test
fun `ByteArray toAlphaNumericString() on byte array with 1 element of value 1`() {
fun `toAlphaNumericString() on byte array with 1 element of value 1`() {
val byteArray = byteArrayOf(1)
byteArray.toAlphaNumericString() shouldBe "23"
}

@Test
fun `ByteArray toAlphaNumericString() on byte array with 1 element of value 0xff`() {
fun `toAlphaNumericString() on byte array with 1 element of value 0xff`() {
val byteArray = byteArrayOf(0xff.toByte())
byteArray.toAlphaNumericString() shouldBe "z9"
}

@Test
fun `ByteArray toAlphaNumericString() on byte array with 1 element of value -1`() {
fun `toAlphaNumericString() on byte array with 1 element of value -1`() {
val byteArray = byteArrayOf(-1)
byteArray.toAlphaNumericString() shouldBe "z9"
}

@Test
fun `ByteArray toAlphaNumericString() on byte array with 1 element of value MIN_VALUE`() {
fun `toAlphaNumericString() on byte array with 1 element of value MIN_VALUE`() {
val byteArray = byteArrayOf(Byte.MIN_VALUE)
byteArray.toAlphaNumericString() shouldBe "j2"
}

@Test
fun `ByteArray toAlphaNumericString() on byte array with 1 element of value MAX_VALUE`() {
fun `toAlphaNumericString() on byte array with 1 element of value MAX_VALUE`() {
val byteArray = byteArrayOf(Byte.MAX_VALUE)
byteArray.toAlphaNumericString() shouldBe "h9"
}

@Test
fun `ByteArray toAlphaNumericString() on byte array containing all possible values`() {
fun `toAlphaNumericString() on byte array containing all possible values`() {
val byteArray =
buildList {
for (i in 0 until 512) {
Expand All @@ -142,6 +148,12 @@ class UtilUnitTest {
"rv3efmqguddfprr4wvpgxwrqzdzj83sd3wbkg8sz6enmqdtn8wxnyju9bf9p8puvdxkqguvhgfvrqzw5jy7sz6" +
"wrnghu9bxdpytvhgxzsh5wrnynuzfxzsz9xhrz9xzvz3"
}

@Test
fun `toAlphaNumericString() with random byte arrays`() = runTest {
val byteArrayArb = Arb.byteArray(length = Arb.int(0, 100), content = Arb.byte())
checkAll(100_000, byteArrayArb) { byteArray -> byteArray.toAlphaNumericString() }
}
}

/*
Expand Down