I've stumbled upon this repository,
The for loop has multiple brackets:
for _, test := range []struct {
missingField string
errorMessage string
}{
{"Name", "missing name for receiver"},
(...)
} {
fields := removeFromStrSlice(mandatory, test.missingField)
(...)
}
configErrorTestRunner(t, config, test.errorMessage)
}
I haven't been able to find anything about this in the go documentation, what is this construct?
The first bracket pair is part of the struct type definition which has the syntax:
struct{
field1 type1
field2 type2
...
}
The second pair is part of the composite literal value, creating a value for the slice of this struct. It has the syntax of:
[]elementType{value1, value2, ...}
The inner, embedded brackets are part of the composite literals creating the struct values of the slice. The type is omitted (it's known from the slice type), so each {field1Value, fieldValue2...} is a struct value.
The third pair defines the block of the for statement. The for statement iterates over the elements of the slice defined by the mentioned composite literal.
To clean up the code for better readability and understanding. Whatever you gave was equivalent to:
type TestStruct struct {
missingField string
errorMessage string
}
testCase := TestStruct {
{
missingField: "Name",
errorMessage: "missing name for receiver",
}
(...)
}
for _, test := range(testCase) {
fields := removeFromStrSlice(mandatory, test.missingField)
}
configErrorTestRunner(t, config, test.errorMessage) is probably from a parent test func
