Remove NPM validation (#3312)

We will drop complete support of NPM as soon as JS IR is declared stable and this test is already a deadweight as it was never run due to misconfiguration
diff --git a/integration-testing/build.gradle b/integration-testing/build.gradle
index 4e025c5..97c9201 100644
--- a/integration-testing/build.gradle
+++ b/integration-testing/build.gradle
@@ -14,11 +14,6 @@
 }
 
 sourceSets {
-    npmTest {
-        kotlin
-        compileClasspath += sourceSets.test.runtimeClasspath
-        runtimeClasspath += sourceSets.test.runtimeClasspath
-    }
     mavenTest {
         kotlin
         compileClasspath += sourceSets.test.runtimeClasspath
@@ -43,20 +38,6 @@
     }
 }
 
-task npmTest(type: Test) {
-    def sourceSet = sourceSets.npmTest
-    environment "projectRoot", project.rootDir
-    environment "deployVersion", version
-    def dryRunNpm = project.properties['dryRun']
-    def doRun = dryRunNpm == "true" // so that we don't accidentally publish anything, especially before the test
-    onlyIf { doRun }
-    if (doRun) { // `onlyIf` only affects execution of the task, not the dependency subtree
-        dependsOn(project(':').getTasksByName("publishNpm", true))
-    }
-    testClassesDirs = sourceSet.output.classesDirs
-    classpath = sourceSet.runtimeClasspath
-}
-
 task mavenTest(type: Test) {
     environment "version", version
     def sourceSet = sourceSets.mavenTest
@@ -96,8 +77,6 @@
 dependencies {
     testImplementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
     testImplementation 'junit:junit:4.12'
-    npmTestImplementation 'org.apache.commons:commons-compress:1.18'
-    npmTestImplementation 'com.google.code.gson:gson:2.8.5'
     debugAgentTestImplementation project(':kotlinx-coroutines-core')
     debugAgentTestImplementation project(':kotlinx-coroutines-debug')
     coreAgentTestImplementation project(':kotlinx-coroutines-core')
@@ -108,5 +87,5 @@
 }
 
 check {
-    dependsOn([npmTest, mavenTest, debugAgentTest, coreAgentTest])
+    dependsOn([mavenTest, debugAgentTest, coreAgentTest])
 }
diff --git a/integration-testing/src/npmTest/kotlin/NpmPublicationValidator.kt b/integration-testing/src/npmTest/kotlin/NpmPublicationValidator.kt
deleted file mode 100644
index 8e1b9f9..0000000
--- a/integration-testing/src/npmTest/kotlin/NpmPublicationValidator.kt
+++ /dev/null
@@ -1,71 +0,0 @@
-/*
- * Copyright 2016-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
- */
-
-package kotlinx.coroutines.validator
-
-import com.google.gson.*
-import org.apache.commons.compress.archivers.tar.*
-import org.junit.*
-import java.io.*
-import java.util.zip.*
-import org.junit.Assert.*
-
-class NpmPublicationValidator {
-    private val VERSION = System.getenv("deployVersion")!!
-    private val BUILD_DIR = System.getenv("projectRoot")!!
-    private val NPM_ARTIFACT = "$BUILD_DIR/kotlinx-coroutines-core/build/npm/kotlinx-coroutines-core-$VERSION.tgz"
-
-    @Test
-    fun testPackageJson() {
-        println("Checking dependencies of $NPM_ARTIFACT")
-        val visited = visit("package.json") {
-            val json = JsonParser().parse(content()).asJsonObject
-            assertEquals(VERSION, json["version"].asString)
-            assertNull(json["dependencies"])
-            val peerDependencies = json["peerDependencies"].asJsonObject
-            assertEquals(1, peerDependencies.size())
-            assertNotNull(peerDependencies["kotlin"])
-        }
-        assertEquals(1, visited)
-    }
-
-    @Test
-    fun testAtomicfuDependencies() {
-        println("Checking contents of $NPM_ARTIFACT")
-        val visited = visit(".js") {
-            val content = content()
-            assertFalse(content, content.contains("atomicfu", true))
-            assertFalse(content, content.contains("atomicint", true))
-            assertFalse(content, content.contains("atomicboolean", true))
-        }
-        assertEquals(2, visited)
-    }
-
-    private fun InputStream.content(): String {
-        val bais = ByteArrayOutputStream()
-        val buffer = ByteArray(DEFAULT_BUFFER_SIZE)
-        var read = read(buffer, 0, DEFAULT_BUFFER_SIZE)
-        while (read >= 0) {
-            bais.write(buffer, 0, read)
-            read = read(buffer, 0, DEFAULT_BUFFER_SIZE)
-        }
-        return bais.toString()
-    }
-
-    private inline fun visit(fileSuffix: String, block: InputStream.(entry: TarArchiveEntry) -> Unit): Int {
-        var visited = 0
-        TarArchiveInputStream(GZIPInputStream(FileInputStream(NPM_ARTIFACT))).use { tais ->
-            var entry: TarArchiveEntry? = tais.nextTarEntry ?: return 0
-            do {
-                if (entry!!.name.endsWith(fileSuffix)) {
-                    ++visited
-                    tais.block(entry)
-                }
-                entry = tais.nextTarEntry
-            } while (entry != null)
-
-            return visited
-        }
-    }
-}