@Test
public void setSeveralVariablesOk() throws Exception {
String expression = "-10 + myVar * (myVar + myVar2) / -myVar3";
ExpressionSolver target = new ExpressionSolver(expression);
target.setVariable("myVar", 1);
target.setVariable("myVar2", 2);
target.setVariable("myVar3", 3);
assertEquals(-11d, target.solve(), 0d);
}
@Test
public void getAllRequiredVariables() throws Exception {
String expression = "1 + myVar + undefinedVar";
ExpressionSolver target = new ExpressionSolver(expression);
target.setVariable("myVar", 1);
Set<String> actual = target.getAllRequiredVariables();
Set<String> expected = new HashSet<>(Arrays.asList("myVar", "undefinedVar"));
assertThat(actual, is(equalTo(expected)));
}
@Test
public void setVariableOk() throws Exception {
String expression = "myVar";
ExpressionSolver target = new ExpressionSolver(expression);
String name = "myVar";
double value = 1.0;
target.setVariable(name, value);
assertEquals(1d, target.solve(), 0d);
}
@Test
public void areAllVariablesBound() throws Exception {
String expression = "1 + myVar";
ExpressionSolver target = new ExpressionSolver(expression);
target.setVariable("myVar", 1);
boolean actual = target.areAllVariablesBound();
boolean expected = true;
assertThat(actual, is(equalTo(expected)));
}
@Test
public void isVariableNotDefined() throws Exception {
String expression = "1 + myVar + undefinedVar";
ExpressionSolver target = new ExpressionSolver(expression);
target.setVariable("myVar", 1);
boolean actual = target.isVariableDefined("undefinedVar");
boolean expected = false;
assertThat(actual, is(equalTo(expected)));
}
@Test
public void functionInFunction() throws Exception {
String expression = "1 + myFunc(myFunc((x + 9*0)))";
ExpressionSolver target = new ExpressionSolver(expression);
target.setVariable("x", 2);
target.addFunction("myFunc", Arrays.asList("x"), "x*x");
double actual = target.solve();
double expected = 17;
assertEquals(expected, actual, 0d);
}
@Test
public void isSolverReady() throws Exception {
String expression = "1 + myVar + myFunc()";
ExpressionSolver target = new ExpressionSolver(expression);
target.setVariable("myVar", 1);
target.addFunction("myFunc", Collections.<String>emptyList(), "2");
boolean actual = target.isReady();
boolean expected = true;
assertThat(actual, is(equalTo(expected)));
}