Go. Assertions for structures should be accurate

[alisevych]

Description

Now tests generated for Go structures have assertNotEquals for the whole structure.
Actual and expected structures have only one different field.
If some other field is different in actual and expected structures, the test will pass too.

Context

for example:
utbot-go/go-samples/simple/supported_types_go_ut_test.go see TestStructWithNanByUtGoFuzzer

Actual behavior

assert.NotEqual(t, Structure{int: -1, int8: 1, int16: 32767, int32: -1, int64: -1, uint: 18446744073709551615, uint8: 0, uint16: 1, uint32: 0, uint64: 18446744073709551615, uintptr: 18446744073709551615, float32: 0.02308184, float64: math.NaN(), complex64: complex(float32(0.02308184), float32(0.02308184)), complex128: complex(0.9412491794821144, 0.9412491794821144), byte: 0, rune: -1, string: "", bool: false}, actualVal)

Expected behavior

assert.NotEqual(t, math.NaN(), actualVal.float64)

Environment

IntelliJ IDEA 2022.1 - 2022.2 Ultimate/Community
GoLand 2022.2

[alisevych]

Can we identify which fields has changed from initial ones?
Then can make assertNotEquals for them only.

Other possible solutions are:

• also add assertEquals for other fields of the structure? Like the following:

assert.NotEqual(t, math.NaN(), actualVal.float64)
assert.Equal(t, -1, actualVal.int)
assert.Equal(t, 1, actualVal.int8)
...

• Or it would be better to use one assertEquals for the whole structure? Like:

assert.Equal(t, Structure{int: -1, int8: 1, int16: 32767, int32: -1, int64: -1, uint: 18446744073709551615, uint8: 0, uint16: 1, uint32: 0, uint64: 18446744073709551615, uintptr: 18446744073709551615, float32: 0.7815346, float64: 0.3332183994766498, complex64: complex(float32(0.7815346), float32(0.7815346)), complex128: complex(0.3332183994766498, 0.3332183994766498), byte: 0, rune: -1, string: "", bool: false}, actualVal)

[alisevych]

During discussion of the issue @Markoutte suggested an assertion approach, that can be useful for all languages:

• Identify target fields and use assertEquals or assertNotEquals for them #1881