test: 💍 Rewrites TypeInferenceTest to Atrium

It was extremely hard to debug tests before: kotest didn't give us
enough information about the very point where expected diverged with
actual result (escpecially in deeply-nested objects). Atrium gives us
pretty reified data n why test is failed as well as much shorter and easier to understand code.

Also this commit moves everything test related to package, corresponding
to API

Author: asm0dey

examples/src/main/kotlin/org/jetbrains/spark/api/examples/Join.kt

@@ -28,7 +28,7 @@ data class Right(val id: Int, val value: Int)
 
 
 fun main() {
-    withSpark {
+    withSpark(logLevel = SparkLogLevel.INFO) {
         val first = dsOf(Left(1, "a"), Left(2, "b"))
         val second = dsOf(Right(1, 100), Right(3, 300))
         first

kotlin-spark-api/pom.xml

@@ -121,7 +121,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
-                <version>2.22.2</version>
+                <version>3.0.0-M5</version>
             </plugin>
             <plugin>
                 <groupId>org.jetbrains.dokka</groupId>

kotlin-spark-api/src/test/kotlin/TypeInferenceTest.kt

@@ -1,4 +1,4 @@
-/*-
+package org.jetbrains.spark.api/*-
  * =LICENSE=
  * Kotlin Spark API
  * ----------
@@ -38,9 +38,15 @@ class ApiTest : ShouldSpec({
             should("contain all generic primitives with complex schema") {
                 val primitives = c(1, 1.0, 1.toFloat(), 1.toByte(), LocalDate.now(), true)
                 val primitives2 = c(2, 2.0, 2.toFloat(), 2.toByte(), LocalDate.now().plusDays(1), false)
-                val tuples: List<Arity6<Int, Double, Float, Byte, LocalDate, Boolean>> = dsOf(primitives, primitives2).toArray<Arity6<Int, Double, Float, Byte, LocalDate, Boolean>>().toList()
+                val tuples = dsOf(primitives, primitives2).collectAsList()
                 expect(tuples).asExpect().contains.inAnyOrder.only.values(primitives, primitives2)
             }
+            should("contain all generic primitives with complex nullable schema") {
+                val primitives = c(1, 1.0, 1.toFloat(), 1.toByte(), LocalDate.now(), true)
+                val nulls = c(null, null, null, null, null, null)
+                val tuples = dsOf(primitives, nulls).collectAsList()
+                expect(tuples).asExpect().contains.inAnyOrder.only.values(primitives, nulls)
+            }
             should("handle cached operations") {
                 val result = dsOf(1, 2, 3, 4, 5)
                         .map { it to (it + 2) }

kotlin-spark-api/src/test/kotlin/ApiTest.kt renamed to kotlin-spark-api/src/test/kotlin/org/jetbrains/spark/api/ApiTest.kt

@@ -1,4 +1,4 @@
-/*-
+package org.jetbrains.spark.api/*-
  * =LICENSE=
  * Kotlin Spark API
  * ----------
@@ -18,7 +18,6 @@
  * =LICENSEEND=
  */
 import io.kotest.core.spec.style.AnnotationSpec
-import org.jetbrains.spark.api.schema
 import kotlin.reflect.typeOf
 
 @OptIn(ExperimentalStdlibApi::class)