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import ch.bfh.parser.StatementParser;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class StatementParserTest {
StatementParser sp = new StatementParser();
// Only testing correct expressions first
@Test
public void emptyExpression() {
sp.parseStatement("");
assertEquals(0.0, sp.getValue(), 0.0);
}
@Test
public void oneFactor() {
sp.parseStatement("10");
assertEquals(10.0, sp.getValue(), 0.0);
}
@Test
public void oneParenthesisedFactor() {
sp.parseStatement("(10)");
assertEquals(10.0, sp.getValue(), 0.0);
}
@Test
public void oneNegativeFactor() {
sp.parseStatement("-10");
assertEquals(-10.0, sp.getValue(), 0.0);
}
@Test
public void oneNegativeParenthesisedFactor() {
sp.parseStatement("-(10)");
assertEquals(-10.0, sp.getValue(), 0.0);
}
@Test
public void oneNegativeParenthesisedNegativeFactor() {
sp.parseStatement("-(-10)");
assertEquals(10.0, sp.getValue(), 0.0);
}
@Test
public void twoFactorSum() {
sp.parseStatement("2+3");
assertEquals(5.0, sp.getValue(), 0.0);
}
@Test
public void twoFactorSub() {
sp.parseStatement("2-3");
assertEquals(-1.0, sp.getValue(), 0.0);
}
@Test
public void twoFactorSumWithSub() {
sp.parseStatement("2--3");
assertEquals(5.0, sp.getValue(), 0.0);
}
@Test
public void twoFactorSumWithSubParenthesised() {
sp.parseStatement("2-(-3)");
assertEquals(5.0, sp.getValue(), 0.0);
}
@Test
public void twoFactorMul() {
sp.parseStatement("2*3");
assertEquals(6.0, sp.getValue(), 0.0);
}
@Test
public void twoFactorDiv() {
sp.parseStatement("11/4");
assertEquals(2.75, sp.getValue(), 0.0);
}
@Test
public void completeArithmeticOperationWithPriorities() {
sp.parseStatement("(4+5)*3/4");
assertEquals(6.75, sp.getValue(), 0.0);
}
@Test
public void variableTest() {
sp.parseStatement("let a = 5");
assertEquals(5.0, sp.getValue(), 0.0);
sp.parseStatement("a");
assertEquals(5.0, sp.getValue(), 0.0);
sp.parseStatement("(a)");
assertEquals(5.0, sp.getValue(), 0.0);
sp.parseStatement("-a");
assertEquals(-5.0, sp.getValue(), 0.0);
sp.parseStatement("-(a)");
assertEquals(-5.0, sp.getValue(), 0.0);
sp.parseStatement("-(-a)");
assertEquals(5.0, sp.getValue(), 0.0);
sp.parseStatement("let b=5*50");
assertEquals(250.0, sp.getValue(), 0.0);
sp.parseStatement("b/a");
assertEquals(50.0, sp.getValue(), 0.0);
sp.parseStatement("b--a");
assertEquals(255.0, sp.getValue(), 0.0);
sp.parseStatement("b+a/2");
assertEquals(252.5, sp.getValue(), 0.0);
sp.parseStatement("let z = b+a/2");
assertEquals(252.5, sp.getValue(), 0.0);
sp.parseStatement("let a = b+a");
assertEquals(255.0, sp.getValue(), 0.0);
}
//TODO - test error detection
}
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