YAML tag in struct not being respected for unmarshalling

[lucaslopezf]

Description

When attempting to unmarshal a YAML configuration using the Config structure, the TestConfig field doesn't correctly map to the test_config key in the YAML. Instead, it seems to be defaulting to the struct field name (TestConfig).

Config struct

type Config struct {
	TestConfig TestConfig `yaml:"test_config"`
}

Expected Behavior

The TestConfig field should map to the test_config key in the YAML.

Actual Behavior:

The TestConfig field maps to the TestConfig key in the YAML.

Steps to Reproduce:

• Create a YAML file with the key test_config and some nested values.
• Attempt to unmarshal this YAML into the Config struct.
• Observe that the TestConfig field does not populate with the values from the test_config key in the YAML.

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