@Test
public void
evaluatingAParsedCoalesceExpression_NullAndAStringWithQuotationMarks_RetunsQuotationMarks()
throws Exception {
Expression e = Coalesce.parse("null ?? \"\\\"\\\"\\\"\\\"\"");
assertThat(e.evaluate(), is(equalTo("\\\"\\\"\\\"\\\"")));
}
@Test
public void createCoalesceExpression_ObjectAndStringOperands_ReturnClassIsString() {
Class<?> expectedClass = Object.class;
Object left = new Object();
Object right = "1";
Expression e = coalesce(left, right);
assertThat(e.getResultClass(), is(assignableTo(expectedClass)));
}
@Test
public void createCoalesceExpression_NullAndObjectOperands_ReturnClassIsString() {
Class<?> expectedClass = String.class;
Object left = null;
Object right = new String();
Expression e = coalesce(left, right);
assertThat(e.getResultClass(), is(assignableTo(expectedClass)));
}
@Test
public void evaluateCoalesceExpression_NotNullOnLeft_ReturnsLeft() throws Exception {
Expression e = coalesce(constant("1"), constant("2"));
assertThat(e.evaluate(), is(equalTo("1")));
}
@Test
public void evaluatingAParsedCoalesceExpression_AAndB_RetunsA() throws Exception {
Expression e = Coalesce.parse("\"a\" ?? \"b\"");
assertThat(e.evaluate(), is(equalTo("a")));
}
@Test
public void createCoalesceExpression_callingToString_getsJavaLikeExpression() {
Expression e = coalesce("a", "b");
assertThat(e.toString(), is("\"a\" ?? \"b\""));
}