RustParserTest.java

/*
 * Copyright (C) 2015 drrb
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.github.drrb.rust.netbeans.rustbridge;

import java.io.File;
import static java.nio.charset.StandardCharsets.UTF_8;
import java.nio.file.Files;
import static org.hamcrest.Matchers.empty;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.not;
import static org.hamcrest.Matchers.nullValue;
import org.junit.After;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

/**
 *
 */
public class RustParserTest {

    @Rule
    public final TemporaryFolder temporaryFolder = new TemporaryFolder();
    private RustParser parser;
    private RustParser.Result result;

    @Before
    public void setUp() {
        parser = new RustParser();
    }

    @After
    public void tearDown() {
        result.destroy();
    }

    @Test
    public void shouldParseValidSource() throws Exception {
        File file = temporaryFolder.newFile("test.rs");
        result = parser.parse(file, "fn main() {}");
        assertTrue(result.isSuccess());
        assertThat(result.getAst(), not(nullValue()));
        assertThat(result.getParseMessages(), is(empty()));
    }

    @Test
    public void shouldHaveErrorsWhenSourceIsInvalid() throws Exception {
        File file = temporaryFolder.newFile("test.rs");
        result = parser.parse(file, "fn main() { 1 2 }");
        assertFalse(result.isSuccess());
        assertThat(result.getAst(), is(nullValue()));
        assertThat(result.getParseMessages(), not(empty()));
    }

    @Test
    public void shouldNotDieWhenThereAreObviousSyntaxErrors() throws Exception {
        File file = temporaryFolder.newFile("test.rs");
        result = parser.parse(file, "fn main() {");
        assertFalse(result.isSuccess());
        assertThat(result.getAst(), is(nullValue()));

        RustParseMessage firstMessage = result.getParseMessages().get(0);
        assertThat(firstMessage.getLevel(), is(RustParseMessage.Level.HELP));
        assertThat(firstMessage.getStartLine(), is(1));
        assertThat(firstMessage.getStartCol(), is(10));
        assertThat(firstMessage.getEndLine(), is(1));
        assertThat(firstMessage.getEndCol(), is(11));
        assertThat(firstMessage.getMessage(), is("did you mean to close this delimiter?"));
    }

    @Test
    public void shouldParseSourceAcrossTwoFiles() throws Exception {
        File firstFile = temporaryFolder.newFile("test.rs");
        File secondFile = temporaryFolder.newFile("other.rs");
        Files.write(secondFile.toPath(), "pub fn other() {}".getBytes(UTF_8));
        result = parser.parse(firstFile, "mod other;\nfn main() { other::other(); }");
        assertTrue(result.isSuccess());
        assertThat(result.getAst(), not(nullValue()));
        assertThat(result.getParseMessages(), is(empty()));
    }

    @Test
    public void shouldOnlyReturnMessagesFromTargetFile() throws Exception {
        File firstFile = temporaryFolder.newFile("test.rs");
        File secondFile = temporaryFolder.newFile("other.rs");
        Files.write(secondFile.toPath(), "pub fn other() { x x }".getBytes(UTF_8));
        result = parser.parse(firstFile, "mod other;\nfn main() { other::other(); }");
        assertTrue(result.isFailure());
        assertThat(result.getParseMessages(), is(empty()));
    }
}