问题
I tried using the assertEquals method on a float and eclipse says that the method was depreciated. Therefore, is the following alternative acceptable?
Assert.assertTrue("Total does not match expected total :",
receipt.getTotal() == 32.19f);
Is there a specific reason why assertEquals must not be used to compare two floats or doubles in a test?
In general, what is the best way to assert the equality of two decimal values in JUnit. I am using the 4.10 release of JUnit
回答1:
In general you can compare primitive types with ==, but with floating point values, two values can look the same (when formatted as a string) but be two different values. You should be using assertEquals(expected, actual, delta). See the answer to JUnit: assertEquals for double values.
Because double (and float) calculations are not necessarily exact, you can compare using a delta (effectively a margin of error).
来源：https://stackoverflow.com/questions/11816804/is-it-ok-to-use-asserttrue-on-float-and-double-values-in-junit