WhileStatementTest.java

package org.dynjs.runtime;

import static org.fest.assertions.Assertions.*;

import org.junit.Test;

public class WhileStatementTest extends AbstractDynJSTestSupport {

    @Test
    public void testBasicLoop() {
        eval("var x = 0;",
                "while(x < 10) {",
                "  ++x;",
                "}");

        Object x = getContext().resolve("x").getValue(getContext());
        assertThat(x).isEqualTo(10L);
    }

    @Test
    public void testLoopWithBreak() {
        eval("var x = 0;",
                "while(true){",
                "  ++x;",
                "  if(x==10){",
                "    break;",
                "  }",
                "}");
        Object x = getContext().resolve("x").getValue(getContext());
        assertThat(x).isEqualTo(10L);
    }

    @Test
    public void testLoopWithContinue() {
        eval("var x = 0;",
                "var y = 0;",
                "while(true){",
                "  ++x;",
                "  if(x==10){",
                "    break;",
                "  }",
                "  if(x % 2 == 0){",
                "    continue;",
                "  }",
                " ++y",
                "}");

        Object x = getContext().resolve("x").getValue(getContext());
        assertThat(x).isEqualTo(10L);

        Object y = getContext().resolve("y").getValue(getContext());
        assertThat(y).isEqualTo(5L);
    }

    @Test
    public void testNullCondition() {
        Object result = eval("var x = 1;",
                "while (null) {",
                "  x = 2;",
                "}",
                "x;");

        assertThat(result).isEqualTo(1L);
    }

    @Test
    public void testZeroCondition() {
        Object result = eval("var x = 1;",
                "while (0) {",
                "  x = 2;",
                "}",
                "x;");

        assertThat(result).isEqualTo(1L);
    }

    @Test
    public void testUndefinedCondition() {
        Object result = eval("var x = 1;",
                "while (undefined) {",
                "  x = 2;",
                "}",
                "x;");

        assertThat(result).isEqualTo(1L);
    }

}