Enhancements for tests

diktat-maven-plugin/src/main/kotlin/org/cqfn/diktat/plugin/maven/DiktatBaseMojo.kt

@@ -5,6 +5,7 @@
 package org.cqfn.diktat.plugin.maven
 
 import org.cqfn.diktat.ruleset.rules.DiktatRuleSetProvider
+import org.cqfn.diktat.ruleset.utils.isKotlinCodeOrScript
 
 import com.pinterest.ktlint.core.KtLint
 import com.pinterest.ktlint.core.LintError
@@ -207,7 +208,7 @@ abstract class DiktatBaseMojo : AbstractMojo() {
         directory
             .walk()
             .filter { file ->
-                file.isDirectory || file.extension.let { it == "kt" || it == "kts" }
+                file.isDirectory || file.toPath().isKotlinCodeOrScript()
             }
             .filter { it.isFile }
             .filterNot { file -> file in excludedFiles || excludedDirs.any { file.startsWith(it) } }

diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter3/files/IndentationRule.kt

@@ -121,7 +121,7 @@ class IndentationRule(configRules: List<RulesConfig>) : DiktatRule(
                 ::KdocIndentationChecker,
                 ::CustomGettersAndSettersChecker,
                 ::ArrowInWhenChecker
-            ).map { it.invoke(configuration) }
+            ).map { it(configuration) }
 
             if (checkIsIndentedWithSpaces(node)) {
                 checkIndentation(node)

diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/utils/FileUtils.kt

@@ -4,7 +4,12 @@
 
 package org.cqfn.diktat.ruleset.utils
 
+import java.nio.file.Path
+import kotlin.io.path.extension
+
 internal const val SRC_DIRECTORY_NAME = "src"
+private const val KOTLIN_EXTENSION = "kt"
+private const val KOTLIN_SCRIPT_EXTENSION = KOTLIN_EXTENSION + "s"
 
 /**
  * Splits [this] string by file path separator.
@@ -17,11 +22,25 @@ fun String.splitPathToDirs(): List<String> =
         .split("/")
 
 /**
- * Checks if [this] String is a name of a kotlin script file by checking whether file extension equals 'kts'
+ * Checks if [this] [String] is a name of a kotlin script file by checking whether file extension equals 'kts'
+ *
+ * @return true if this is a kotlin script file name, false otherwise
+ */
+fun String.isKotlinScript() = endsWith(".$KOTLIN_SCRIPT_EXTENSION")
+
+/**
+ * Check if [this] [Path] is a kotlin script by checking whether an extension equals to 'kts'
  *
  * @return true if this is a kotlin script file name, false otherwise
  */
-fun String.isKotlinScript() = endsWith(".kts")
+fun Path.isKotlinScript() = this.extension.lowercase() == KOTLIN_SCRIPT_EXTENSION
+
+/**
+ * Check if [this] [Path] is a kotlin code or script by checking whether an extension equals to `kt` or 'kts'
+ *
+ * @return true if this is a kotlin code or script file name, false otherwise
+ */
+fun Path.isKotlinCodeOrScript() = this.extension.lowercase() in setOf(KOTLIN_EXTENSION, KOTLIN_SCRIPT_EXTENSION)
 
 /**
  * Checks if [this] String is a name of a gradle kotlin script file by checking whether file extension equals 'gradle.kts'

diktat-rules/src/test/kotlin/org/cqfn/diktat/ruleset/chapter2/HeaderCommentRuleTest.kt

@@ -221,7 +221,7 @@ class HeaderCommentRuleTest : LintTestBase(::HeaderCommentRule) {
         lintMethod(
             """
                 /*
-                 * Copyright (c) 2023 My Company, Ltd. All rights reserved.
+                 * Copyright (c) $curYear My Company, Ltd. All rights reserved.
                  */
                 /**
                  * Very useful description, why this file has two classes
@@ -244,7 +244,7 @@ class HeaderCommentRuleTest : LintTestBase(::HeaderCommentRule) {
         lintMethod(
             """
                 /*
-                 * Copyright (c) My Company, Ltd. 2012-2023. All rights reserved.
+                 * Copyright (c) My Company, Ltd. 2012-$curYear. All rights reserved.
                  */
                 /**
                  * Very useful description, why this file has two classes
@@ -267,7 +267,7 @@ class HeaderCommentRuleTest : LintTestBase(::HeaderCommentRule) {
         lintMethod(
             """
                 /*
-                   Copyright (c) My Company, Ltd. 2021-2023. All rights reserved.
+                   Copyright (c) My Company, Ltd. 2021-$curYear. All rights reserved.
                  */
                 /**
                  * Very useful description, why this file has two classes
@@ -290,7 +290,7 @@ class HeaderCommentRuleTest : LintTestBase(::HeaderCommentRule) {
         lintMethod(
             """
                 /*
-                 *  Copyright (c) My Company, Ltd. 2002-2023. All rights reserved.
+                 *  Copyright (c) My Company, Ltd. 2002-$curYear. All rights reserved.
                  */
                 /**
                  * Very useful description, why this file has two classes

diktat-rules/src/test/kotlin/org/cqfn/diktat/ruleset/junit/CloseablePath.kt

@@ -1,5 +1,7 @@
 package org.cqfn.diktat.ruleset.junit
 
+import org.cqfn.diktat.test.framework.util.resetPermissions
+import org.cqfn.diktat.test.framework.util.tryToDeleteOnExit
 import org.junit.jupiter.api.extension.ExtensionContext.Store.CloseableResource
 import java.io.IOException
 import java.nio.file.DirectoryNotEmptyException
@@ -15,6 +17,7 @@ import kotlin.io.path.absolute
 import kotlin.io.path.deleteExisting
 import kotlin.io.path.isDirectory
 import kotlin.io.path.notExists
+import kotlin.io.path.relativeToOrSelf
 
 /**
  * @property directory the temporary directory (will be recursively deleted once
@@ -102,48 +105,16 @@ data class CloseablePath(val directory: Path) : CloseableResource {
         @Suppress("WRONG_NEWLINES")  // False positives, see #1495.
         val joinedPaths = keys
             .asSequence()
+            .map(Path::tryToDeleteOnExit)
             .map { path ->
-                path.tryToDeleteOnExit()
-            }.map { path ->
-                path.relativizeSafely()
-            }.map(Any::toString)
+                path.relativeToOrSelf(directory)
+            }
+            .map(Any::toString)
             .joinToString()
 
         return IOException("Failed to delete temp directory ${directory.absolute()}. " +
                 "The following paths could not be deleted (see suppressed exceptions for details): $joinedPaths").apply {
             values.forEach(this::addSuppressed)
         }
     }
-
-    private fun Path.tryToDeleteOnExit(): Path {
-        try {
-            toFile().deleteOnExit()
-        } catch (_: UnsupportedOperationException) {
-            /*
-             * Ignore.
-             */
-        }
-
-        return this
-    }
-
-    private fun Path.relativizeSafely(): Path =
-        try {
-            directory.relativize(this)
-        } catch (_: IllegalArgumentException) {
-            this
-        }
-
-    private companion object {
-        private fun Path.resetPermissions() {
-            toFile().apply {
-                setReadable(true)
-                setWritable(true)
-
-                if (isDirectory) {
-                    setExecutable(true)
-                }
-            }
-        }
-    }
 }

diktat-rules/src/test/kotlin/org/cqfn/diktat/ruleset/utils/AstNodeUtilsTest.kt

@@ -31,6 +31,7 @@ import com.pinterest.ktlint.core.ast.ElementType.WHITE_SPACE
 import com.pinterest.ktlint.core.ast.isLeaf
 import com.pinterest.ktlint.core.ast.nextCodeSibling
 import com.pinterest.ktlint.core.ast.nextSibling
+import org.intellij.lang.annotations.Language
 import org.jetbrains.kotlin.com.intellij.lang.ASTNode
 import org.jetbrains.kotlin.com.intellij.psi.impl.source.tree.PsiWhiteSpaceImpl
 import org.jetbrains.kotlin.com.intellij.psi.tree.IElementType
@@ -807,7 +808,7 @@ private class PrettyPrintingVisitor(private val elementType: IElementType,
     companion object {
         fun assertStringRepr(
             elementType: IElementType,
-            code: String,
+            @Language("kotlin") code: String,
             level: Int = 0,
             maxLevel: Int = -1,
             expected: String

diktat-rules/src/test/kotlin/org/cqfn/diktat/util/DiktatRuleSetProvider4Test.kt

@@ -13,6 +13,7 @@ import org.cqfn.diktat.common.config.rules.RulesConfig
 import org.cqfn.diktat.common.config.rules.RulesConfigReader
 import org.cqfn.diktat.ruleset.rules.DiktatRuleSetProvider
 import org.cqfn.diktat.ruleset.rules.OrderedRuleSet.Companion.delegatee
+import org.cqfn.diktat.test.framework.util.filterContentMatches
 
 import com.pinterest.ktlint.core.Rule
 import com.pinterest.ktlint.core.RuleSet
@@ -21,7 +22,12 @@ import org.assertj.core.api.Assertions.assertThat
 import org.junit.jupiter.api.Assertions
 import org.junit.jupiter.api.Test
 
-import java.io.File
+import java.nio.file.Path
+import kotlin.io.path.ExperimentalPathApi
+import kotlin.io.path.Path
+import kotlin.io.path.isRegularFile
+import kotlin.io.path.nameWithoutExtension
+import kotlin.io.path.walk
 
 /**
  * simple class for emulating RuleSetProvider to inject .yml rule configuration and mock this part of code
@@ -38,28 +44,19 @@ class DiktatRuleSetProvider4Test(private val ruleSupplier: (rulesConfigList: Lis
 }
 
 class DiktatRuleSetProviderTest {
+    @OptIn(ExperimentalPathApi::class)
     @Suppress("UnsafeCallOnNullableType")
     @Test
     fun `check DiktatRuleSetProviderTest contain all rules`() {
         val path = "${System.getProperty("user.dir")}/src/main/kotlin/org/cqfn/diktat/ruleset/rules"
-        val filesName = File(path)
+        val fileNames = Path(path)
             .walk()
-            .filter { it.isFile }
-            .filter { file ->
-                /*
-                 * Include only those files which contain `Rule` or `DiktatRule`
-                 * descendants (any of the 1st 150 lines contains a superclass
-                 * constructor call).
-                 */
-                val constructorCall = Regex(""":\s*(?:Diktat)?Rule\s*\(""")
-                file.bufferedReader().lineSequence().take(150)
-                    .any { line ->
-                        line.contains(constructorCall)
-                    }
-            }
-            .map { it.nameWithoutExtension }
-            .filterNot { it in ignoreFile }
-        val rulesName = DiktatRuleSetProvider().get()
+            .filter(Path::isRegularFile)
+            .filterContentMatches(linesToRead = 150, Regex(""":\s*(?:Diktat)?Rule\s*\("""))
+            .map(Path::nameWithoutExtension)
+            .filterNot { it in ignoredFileNames }
+            .toList()
+        val ruleNames = DiktatRuleSetProvider().get()
             .asSequence()
             .onEachIndexed { index, rule ->
                 if (index != 0) {
@@ -70,16 +67,22 @@ class DiktatRuleSetProviderTest {
                 }
             }
             .map { it.delegatee() }
-            .map { it::class.simpleName!! }
-            .filterNot { it == "DummyWarning" }
+            .map { it::class.simpleName }
+            .filterNotNull()
+            .filterNot { it in ignoredRuleNames }
             .toList()
-        assertThat(rulesName.sorted()).containsExactlyElementsOf(filesName.sorted().toList())
+        assertThat(fileNames).isNotEmpty
+        assertThat(ruleNames).isNotEmpty
+        assertThat(ruleNames.sorted()).containsExactlyElementsOf(fileNames.sorted())
     }
 
     companion object {
-        private val ignoreFile = listOf(
+        private val ignoredFileNames = listOf(
             "DiktatRule",
             "OrderedRuleSet",
         )
+        private val ignoredRuleNames = listOf(
+            "DummyWarning",
+        )
     }
 }

diktat-rules/src/test/kotlin/org/cqfn/diktat/util/TestUtils.kt

@@ -15,21 +15,90 @@ import com.pinterest.ktlint.core.Rule
 import com.pinterest.ktlint.core.RuleSet
 import org.assertj.core.api.Assertions.assertThat
 import org.assertj.core.api.Assertions.fail
+import org.intellij.lang.annotations.Language
 import org.jetbrains.kotlin.com.intellij.lang.ASTNode
 
+import java.io.Reader
 import java.util.concurrent.atomic.AtomicInteger
+import kotlin.contracts.ExperimentalContracts
+import kotlin.contracts.InvocationKind.EXACTLY_ONCE
+import kotlin.contracts.contract
 
 internal const val TEST_FILE_NAME = "TestFileName.kt"
 
+private val debuggerPromptPrefixes: Array<out String> = arrayOf(
+    "Listening for transport dt_socket at address: ",
+    "Listening for transport dt_shmem at address: ",
+)
+
 /**
  * Casts a nullable value to a non-`null` one, similarly to the `!!`
  * operator.
  *
  * @param lazyFailureMessage the message to evaluate in case of a failure.
  * @return a non-`null` value.
  */
-internal fun <T> T?.assertNotNull(lazyFailureMessage: () -> String = { "Expecting actual not to be null" }): T =
-    this ?: fail(lazyFailureMessage())
+@OptIn(ExperimentalContracts::class)
+internal fun <T : Any> T?.assertNotNull(lazyFailureMessage: () -> String = { "Expecting actual not to be null" }): T {
+    contract {
+        returns() implies (this@assertNotNull != null)
+    }
+
+    return this ?: fail(lazyFailureMessage())
+}
+
+/**
+ * Calls the [block] callback giving it a sequence of all the lines in this file
+ * and closes the reader once the processing is complete.
+ *
+ * If [filterDebuggerPrompt] is `true`, the JVM debugger prompt is filtered out
+ * from the sequence of lines before it is consumed by [block].
+ *
+ * If [filterDebuggerPrompt] is `false`, this function behaves exactly as the
+ * overloaded function from the standard library.
+ *
+ * @param filterDebuggerPrompt whether the JVM debugger prompt should be
+ *   filtered out.
+ * @param block the callback which consumes the lines produced by this [Reader].
+ * @return the value returned by [block].
+ */
+@OptIn(ExperimentalContracts::class)
+internal fun <T> Reader.useLines(
+    filterDebuggerPrompt: Boolean,
+    block: (Sequence<String>) -> T,
+): T {
+    contract {
+        callsInPlace(block, EXACTLY_ONCE)
+    }
+
+    return when {
+        filterDebuggerPrompt -> {
+            /*
+             * Transform the line consumer.
+             */
+            { lines ->
+                lines.filterNot(String::isDebuggerPrompt).let(block)
+            }
+        }
+
+        else -> block
+    }.let(this::useLines)
+}
+
+private fun String.isDebuggerPrompt(printIfTrue: Boolean = true): Boolean {
+    val isDebuggerPrompt = debuggerPromptPrefixes.any { prefix ->
+        this.startsWith(prefix)
+    }
+    if (isDebuggerPrompt && printIfTrue) {
+        /*
+         * Print the prompt to the standard out,
+         * so that the IDE can attach to the debugger.
+         */
+        @Suppress("DEBUG_PRINT")
+        println(this)
+    }
+    return isDebuggerPrompt
+}
 
 /**
  * This utility function lets you run arbitrary code on every node of given [code].
@@ -41,7 +110,7 @@ internal fun <T> T?.assertNotNull(lazyFailureMessage: () -> String = { "Expectin
  * @param applyToNode Function to be called on each AST node, should increment counter if assert is called
  */
 @Suppress("TYPE_ALIAS")
-internal fun applyToCode(code: String,
+internal fun applyToCode(@Language("kotlin") code: String,
                          expectedAsserts: Int,
                          applyToNode: (node: ASTNode, counter: AtomicInteger) -> Unit
 ) {