bazel coverage does not calculate coverage correctly

[bejelith]

when running bazel coverage on this code i get 0 lines covered in the report
types.go

func WithReadOnly(readOnly bool) DataSourceOption {
	return func(d *DataSourceRequest) *DataSourceRequest {
		d.ReadOnly = readOnly
		return d
	}
}

types_test.go

func TestWithReadOnly(t *testing.T) {
	tests := []struct {
		name     string
		readOnly bool
	}{
		{"Set readOnly to true", true},
		{"Set readOnly to false", false},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			ds := &DataSourceRequest{}
			option := WithReadOnly(tt.readOnly)
			option(ds)
			assert.Equal(t, tt.readOnly, ds.ReadOnly)
		})
	}
}

but running go test -coverprofile=output ./... returns the correct amount of covered lines.
Im running coverage with the following config

coverage --experimental_split_coverage_postprocessing
coverage --experimental_fetch_all_coverage_outputs
coverage --combined_report=lcov
coverage --nocache_test_results

Is this a bug or am I missing something?

[fmeum]

Bazel excludes coverage of test code by default. Could you try --instrument_test_targets?

[bejelith]

@fmeum ur answer fixed my issue but now my coverage report is full of _test.go files.

Let me be more specific the code is in two files: in types.go and the test (TestWithReadOnly) is in types_test.go

It'd espect types.go to have 100% coverage without having to instrument types_test.go

[fmeum]

Could you share a self-contained reproducer? That would make it easier to understand your target structure and experiment with different settings.