Unexpected tests for some inherited methods on enums

[sofurihafe]

Description

Generated tests for enum contain methods testing valueOf

To Reproduce

1. Run Contest Estimator with method com.google.common.base.CaseFormat.* and 300s time limit.

Actual behavior

Generated tests contain the following:

 @Test
 //@org.junit.jupiter.api.DisplayName("valueOf: arg_0 = blank string -> throw IllegalArgumentException")
 public void testValueOfThrowsIAEWithBlankString() {
 /* This test fails because executable under testing com.google.common.base.CaseFormat.valueOf
 produces Runtime exception java.lang.IllegalArgumentException: No enum constant com.google.common.base.CaseFormat. */
 CaseFormat.valueOf(" ");
 }

 @Test
 //@org.junit.jupiter.api.DisplayName("valueOf: arg_0 has special characters -> throw IllegalArgumentException")
 public void testValueOfThrowsIAEWithBlankString1() {
 /* This test fails because executable under testing com.google.common.base.CaseFormat.valueOf
 produces Runtime exception java.lang.IllegalArgumentException: No enum constant com.google.common.base.CaseFormat.
	
 */
 CaseFormat.valueOf("\n\t\r");
 }

[EgorkaKulikov]

This behaviour can also be reproduced on equals and hashCode methods.

[dtim]

It seems that tests for Enum::valueOf(String) and Enum::values() are correct by themselves: these methods are not inherited but generated by the compiler as a part of a specific enum class. At the same time they are redundant, as they test the generated code on that users do not have any control.

[dtim]

My opinion: we should generate tests for overridden hashCode, equals, toString etc (including anonymous classes), but not to generate tests for inherited methods where no user-defined implementation is present in the class under test.

TODO: check if tests are generated for inherited methods without user-defined implementation.