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package com.oracle.truffle.tck.tests;

import java.util.AbstractMap;
import java.util.Collection;
import java.util.Objects;
import org.graalvm.polyglot.Value;
import org.junit.Assume;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.graalvm.polyglot.PolyglotException;
import org.junit.AfterClass;

@RunWith(Parameterized.class)
public class ExpressionTest {

    private static final TestUtil.CollectingMatcher TEST_RESULT_MATCHER = TestUtil.createTooManyFailuresMatcher();
    private static TestContext context;
    private final TestRun testRun;

    @Parameterized.Parameters(name = "{0}")
    public static Collection createExpressionTests() {
        context = new TestContext(ExpressionTest.class);
        final Collection testRuns = TestUtil.createTestRuns(
                        TestUtil.getRequiredLanguages(context),
                        TestUtil.getRequiredValueLanguages(context),
                        lang -> context.getExpressions(null, null, lang),
                        lang -> context.getValueConstructors(null, lang));
        if (testRuns.isEmpty()) {
            // BeforeClass and AfterClass annotated methods are not called when there are no tests
            // to run. But we need to free TestContext.
            afterClass();
        }
        return testRuns;
    }

    @BeforeClass
    public static void setUpClass() {
        TestUtil.assertNoCurrentContext();
    }

    @AfterClass
    public static void afterClass() {
        context.close();
        context = null;
    }

    public ExpressionTest(final TestRun testRun) {
        Objects.requireNonNull(testRun);
        this.testRun = testRun;
    }

    @Test
    public void testExpression() {
        Assume.assumeThat(testRun, TEST_RESULT_MATCHER);
        boolean success = false;
        Value result = null;
        PolyglotException ex = null;
        try {
            try {
                result = testRun.getSnippet().getExecutableValue().execute(testRun.getActualParameters().toArray());
            } catch (IllegalArgumentException e) {
                ex = context.getContext().asValue(e).as(PolyglotException.class);
                TestUtil.validateResult(testRun, ex);
                success = true;
            } catch (PolyglotException e) {
                ex = e;
                TestUtil.validateResult(testRun, e);
                success = true;
            }
            if (result != null) {
                TestUtil.validateResult(testRun, result, true);
                success = true;
            }
        } catch (PolyglotException | AssertionError e) {
            throw new AssertionError(
                            TestUtil.formatErrorMessage(
                                            "Unexpected Exception: " + e.getMessage(),
                                            testRun,
                                            context, result, ex),
                            e);
        } finally {
            TEST_RESULT_MATCHER.accept(new AbstractMap.SimpleImmutableEntry<>(testRun, success));
        }
    }
}