Create tests module

Author: koperagen

settings.gradle.kts

@@ -6,6 +6,7 @@ enableFeaturePreview("VERSION_CATALOGS")
 includeBuild("generator")
 include("plugins:dataframe-gradle-plugin")
 include("plugins:symbol-processor")
+include("tests")
 
 //include("examples:idea-examples:titanic")
 //include("examples:idea-examples:movies")

tests/build.gradle.kts

@@ -0,0 +1,29 @@
+plugins {
+    id("java")
+    kotlin("jvm")
+    kotlin("plugin.dataframe")
+}
+
+group = "org.jetbrains.kotlinx"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation(project(":"))
+    testImplementation(libs.junit)
+    testImplementation(libs.kotestAssertions) {
+        exclude("org.jetbrains.kotlin", "kotlin-stdlib-jdk8")
+    }
+    testImplementation(libs.kotlin.datetimeJvm)
+}
+
+kotlin.sourceSets {
+    main {
+        kotlin.srcDir("build/generated/ksp/main/kotlin/")
+    }
+    test {
+        kotlin.srcDir("build/generated/ksp/test/kotlin/")
+    }
+}

tests/src/test/kotlin/org/jetbrains/kotlinx/dataframe/api/implode.kt

@@ -0,0 +1,21 @@
+package org.jetbrains.kotlinx.dataframe.api
+
+import io.kotest.matchers.shouldBe
+import org.junit.Test
+
+class ImplodeTests {
+
+    @Test
+    fun `implode into`() {
+        val df = dataFrameOf("a" to listOf(1, 1), "b" to listOf(2, 3))
+        val imploded = df.implode { "b" into "c" }
+        val expected = dataFrameOf("a" to listOf(1), "c" to listOf(listOf(2, 3)))
+        imploded shouldBe expected
+    }
+
+    @Test
+    fun `implode all`() {
+        val df = dataFrameOf("a" to listOf(1, 1), "b" to listOf(2, 3))
+        df.implode() shouldBe df.implode { all() }[0]
+    }
+}