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No commits in common. "05620d9823f1638fa4ad15eef4fd6caf1e171eb5" and "d583784ee870b4b577f31129c0235f86d1cda25d" have entirely different histories.
05620d9823
...
d583784ee8
7 changed files with 26 additions and 313 deletions
26
.github/workflows/maven.yml
vendored
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26
.github/workflows/maven.yml
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# This workflow will build a Java project with Maven, and cache/restore any dependencies to improve the workflow execution time
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# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-java-with-maven
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name: Java CI with Maven
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on:
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push:
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branches: [ "master" ]
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pull_request:
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branches: [ "master" ]
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jobs:
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build:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v3
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- name: Set up JDK 11
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uses: actions/setup-java@v3
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with:
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java-version: '17'
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distribution: 'temurin'
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cache: maven
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- name: Build with Maven
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run: mvn -B package --file pom.xml
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steps:
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- name: test
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image: maven:3.9.6-eclipse-temurin-17-alpine
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commands:
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- mvn -B verify
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31
pom.xml
31
pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
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http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>eu.ztsh.training</groupId>
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<artifactId>hackerrank</artifactId>
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<version>1.0-SNAPSHOT</version>
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<properties>
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<maven.compiler.source>17</maven.compiler.source>
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<maven.compiler.target>17</maven.compiler.target>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter</artifactId>
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<version>5.9.0</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>3.23.1</version>
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</dependency>
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</dependencies>
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</project>
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@ -1,126 +0,0 @@
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package eu.ztsh.training.hackerrank;
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import java.util.List;
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import java.util.Scanner;
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import eu.ztsh.training.hackerrank.SolutionClassDescription.FieldModifier;
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import org.junit.jupiter.api.Disabled;
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import org.junit.jupiter.api.DisplayName;
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import org.junit.jupiter.api.Nested;
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import org.junit.jupiter.api.Test;
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import static org.assertj.core.api.Assertions.assertThat;
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public class EnvironmentTest {
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abstract static class HackerRankEnvironmentTest extends HackerRankTest {
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@Test
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public void passTwoLinesTest() {
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var input = List.of(
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"Line 1",
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"Line 2"
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);
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var result = invoke(input);
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assertThat(result).containsExactlyElementsOf(input);
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}
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@Test
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public void multiInvokeTest() {
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var input = List.of(
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"Line 1",
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"Line 2"
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);
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invoke(input);
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invoke(input);
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var result = invoke(input);
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assertThat(result).containsExactlyElementsOf(input);
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}
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@Test
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public void passTwoAnotherLinesTest() {
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var input = List.of(
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"Line 3",
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"Line 4"
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);
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var result = invoke(input);
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assertThat(result).containsExactlyElementsOf(input);
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}
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}
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@Nested
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@DisplayName("Test with Scanner created as private static field")
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class EnvironmentPrivateStaticTest extends HackerRankEnvironmentTest {
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@Override
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protected SolutionClassDescription getSolutionClassDescription() {
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return new SolutionClassDescription(SampleSolutionWithPrivateStaticScanner.class,
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"scan",
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new FieldModifier[]{FieldModifier.PRIVATE, FieldModifier.STATIC});
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}
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}
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@Disabled("Disabled: run with --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.lang.reflect=ALL-UNNAMED")
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@Nested
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@DisplayName("Test with Scanner created as private static final field")
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class EnvironmentPrivateStaticFinalTest extends HackerRankEnvironmentTest {
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@Override
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protected SolutionClassDescription getSolutionClassDescription() {
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return new SolutionClassDescription(SampleSolutionWithPrivateStaticScanner.class,
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"scan",
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FieldModifier.values());
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}
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}
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@Nested
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@DisplayName("Test with Scanner created in main(String[]) method")
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class EnvironmentInlineTest extends HackerRankEnvironmentTest {
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@Override
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protected SolutionClassDescription getSolutionClassDescription() {
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return new SolutionClassDescription(SampleSolutionWithInlineScanner.class);
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}
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}
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}
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class SampleSolutionWithPrivateStaticScanner {
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public static void main(String... args) {
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while (scan.hasNext()) {
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System.out.println(scan.nextLine());
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}
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}
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@SuppressWarnings("FieldMayBeFinal")
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private static Scanner scan = new Scanner(System.in);
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}
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class SampleSolutionWithPrivateStaticFinalScanner {
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public static void main(String... args) {
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while (scan.hasNext()) {
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System.out.println(scan.nextLine());
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}
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}
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private static final Scanner scan = new Scanner(System.in);
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}
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class SampleSolutionWithInlineScanner {
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public static void main(String... args) {
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var scan = new Scanner(System.in);
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while (scan.hasNext()) {
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System.out.println(scan.nextLine());
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}
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}
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}
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@ -1,73 +0,0 @@
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package eu.ztsh.training.hackerrank;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.InputStream;
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import java.io.PrintStream;
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import java.lang.reflect.InvocationTargetException;
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import java.util.Arrays;
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import java.util.List;
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import org.junit.jupiter.api.AfterAll;
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import org.junit.jupiter.api.BeforeAll;
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/**
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* Common class with all the necessary logic
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*/
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public abstract class HackerRankTest {
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@BeforeAll
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public static void setUpStreams() {
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// Redirect stdout & stderr to own streams
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System.setOut(new PrintStream(outContent));
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System.setErr(new PrintStream(errContent));
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}
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@AfterAll
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public static void restoreStreams() {
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System.setOut(originalOut);
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System.setErr(originalErr);
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System.setIn(originalIn);
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}
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protected List<String> invoke(List<String> input) {
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try {
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// reset our stdout as check is based on it
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outContent.reset();
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// write content to args of Solution#main
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writeLines(input);
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// check if scanner has other name than "scanner"
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if (getSolutionClassDescription().fieldName() != null) {
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ReflectionHelper.reloadScanner(getSolutionClassDescription());
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}
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// run Solution#main
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getSolutionClassDescription().targetClass()
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.getMethod("main", String[].class)
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.invoke(null, (Object) new String[]{});
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// return intercepted output
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return readLines();
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} catch (final NoSuchMethodException | InvocationTargetException | IllegalAccessException |
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NoSuchFieldException e) {
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throw new IllegalStateException(e);
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}
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}
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protected abstract SolutionClassDescription getSolutionClassDescription();
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private void writeLines(List<String> lines) {
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// https://stackoverflow.com/a/31635737
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System.setIn(new ByteArrayInputStream((String.join(System.lineSeparator(), lines) + System.lineSeparator()).getBytes()));
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}
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private List<String> readLines() {
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// https://stackoverflow.com/a/1119559
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return List.copyOf(Arrays.stream(outContent.toString().split(System.lineSeparator())).toList());
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}
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private final static ByteArrayOutputStream outContent = new ByteArrayOutputStream();
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private final static ByteArrayOutputStream errContent = new ByteArrayOutputStream();
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private final static PrintStream originalOut = System.out;
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private final static PrintStream originalErr = System.err;
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private final static InputStream originalIn = System.in;
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}
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@ -1,52 +0,0 @@
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package eu.ztsh.training.hackerrank;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.VarHandle;
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import java.lang.reflect.Field;
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import java.lang.reflect.Modifier;
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import java.util.Scanner;
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import eu.ztsh.training.hackerrank.SolutionClassDescription.FieldModifier;
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/**
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* Util that helps with scanner declared outside Solution#main
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*/
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public class ReflectionHelper {
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// https://stackoverflow.com/a/56043252
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static {
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try {
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var lookup = MethodHandles.privateLookupIn(Field.class, MethodHandles.lookup());
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MODIFIERS = lookup.findVarHandle(Field.class, "modifiers", int.class);
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CAN_MODIFY_FINALS = true;
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} catch (IllegalAccessException | NoSuchFieldException ex) {
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CAN_MODIFY_FINALS = false;
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}
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}
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/**
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* Modify scanner field to substitute it with custom readable one
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*
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* @param description Solution class parameters
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* @throws NoSuchFieldException when there description.fieldName points to incorrect name
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* @throws IllegalAccessException on scanner substitution error
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*/
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static void reloadScanner(SolutionClassDescription description)
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throws NoSuchFieldException, IllegalAccessException {
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// https://stackoverflow.com/a/3301720
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var scannerField = description.hasModifier(FieldModifier.STATIC)
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? description.targetClass().getDeclaredField(description.fieldName())
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: description.targetClass().getField(description.fieldName());
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if (description.hasModifier(FieldModifier.PRIVATE)) {
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scannerField.setAccessible(true);
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}
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if (description.hasModifier(FieldModifier.FINAL) && CAN_MODIFY_FINALS) {
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MODIFIERS.set(scannerField, scannerField.getModifiers() & ~Modifier.FINAL);
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}
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scannerField.set(null, new Scanner(System.in));
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}
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private static VarHandle MODIFIERS;
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private static boolean CAN_MODIFY_FINALS;
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}
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@ -1,26 +0,0 @@
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package eu.ztsh.training.hackerrank;
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import java.util.Arrays;
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/**
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* Solution params definition
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*
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* @param targetClass Solution
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* @param fieldName scanner field name
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* @param modifiers scanner field modifiers
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*/
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public record SolutionClassDescription(Class<?> targetClass, String fieldName, FieldModifier[] modifiers) {
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SolutionClassDescription(Class<?> targetClass) {
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this(targetClass, null, null);
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}
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public boolean hasModifier(FieldModifier modifier) {
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return Arrays.asList(modifiers).contains(modifier);
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}
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public enum FieldModifier {
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PRIVATE, FINAL, STATIC
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}
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}
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Loading…
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Reference in a new issue