package foo

import com.google.inject.Inject
import de.MyProvider
import de.Expression
import org.eclipse.xtext.junit4.InjectWith
import org.eclipse.xtext.junit4.XtextRunner
import org.eclipse.xtext.junit4.util.ParseHelper
import org.junit.Test
import org.junit.runner.RunWith

import static org.junit.Assert.*
import org.eclipse.emf.common.util.BasicDiagnostic

@RunWith(typeof(XtextRunner))
@InjectWith(typeof(de.MyInjectorProvider)) // generated by Xtext for your grammar
class ExpressionJavaValidatorTest {

    // class to test
    @Inject ExpressionJavaValidator validator

    // utility to parse code snippets
    @Inject ParseHelper<Expression> parseHelper

    def parse(String expression) {
        parseHelper.parse(expression)
    }
    
    @Test
    def void testInvalidMathOperation() {
        var expression = parse("1 + \"test\"") // a dummy expression 
        var chain = new BasicDiagnostic();
        validator.validate(expression, chain, null); 
        assertTrue(chain.severity != 0) // test that the expression contains an error
    }
	
}