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S001HelloWordExperimentsTest.java
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S001HelloWordExperimentsTest.java
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package org.meri.antlr_step_by_step.parsers;
import static org.junit.Assert.assertEquals;
import org.antlr.runtime.tree.CommonTree;
import org.junit.Test;
public class S001HelloWordExperimentsTest {
@Test
public void testSmallError() {
//compile the expression
S001HelloWordCompiler compiler = new S001HelloWordCompiler();
CommonTree ast = compiler.compile("Hello word?");
//check AST structure
assertEquals(S001HelloWordParser.SALUTATION, ast.getChild(0).getType());
assertEquals(S001HelloWordParser.ENDSYMBOL, ast.getChild(1).getType());
}
@Test
public void testBiggerError() {
//compile the expression
S001HelloWordCompiler compiler = new S001HelloWordCompiler();
CommonTree ast = compiler.compile("Bye!");
//check AST structure
assertEquals(S001HelloWordParser.SALUTATION, ast.getChild(0).getType());
assertEquals(S001HelloWordParser.ENDSYMBOL, ast.getChild(1).getType());
}
@Test
public void testCompletelyWrong() {
//compile the expression
S001HelloWordCompiler compiler = new S001HelloWordCompiler();
CommonTree ast = compiler.compile("Incorrect Expression");
//check AST structure
assertEquals(0, ast.getChildCount());
}
}