fix: finish progressive Target detection

internal/apt/apt_test.go

@@ -46,6 +46,19 @@ func TestAvailabilityRequiresDebianMarkerAPTToolAndConfigurationDirectory(t *tes
 	}
 }
 
+func TestDetectClassifiesInspectionFailureAndUsesOneEffectiveConfigurationProbe(t *testing.T) {
+	a, runner := newAdapter(t, nil)
+	runner.outputError = true
+
+	detection := a.Detect(context.Background(), compatibleProfile())
+	if detection.Err == nil || detection.Inspection.State != target.Disabled {
+		t.Fatalf("detection = %#v, want failed Disabled inspection", detection)
+	}
+	if runner.outputs != 1 {
+		t.Fatalf("Detect issued %d apt-config dumps, want one", runner.outputs)
+	}
+}
+
 func TestDiagnosticChecksCoverCommandSchemaAndAuthorityWithoutMutation(t *testing.T) {
 	a, _ := newAdapter(t, nil)
 	checks := a.DiagnosticChecks(context.Background(), compatibleProfile())
@@ -442,6 +455,7 @@ func newFailingAdapter(t *testing.T, files *failingFS) (*apt.Adapter, *fakeRunne
 type fakeRunner struct {
 	available, outputError                          bool
 	overlay, external, override, failDumpAfterWrite string
+	outputs                                         int
 }
 
 func (r *fakeRunner) LookPath(string) (string, error) {
@@ -451,6 +465,7 @@ func (r *fakeRunner) LookPath(string) (string, error) {
 	return "/usr/bin/apt-config", nil
 }
 func (r *fakeRunner) Output(context.Context, string, ...string) ([]byte, error) {
+	r.outputs++
 	if r.outputError {
 		return nil, errors.New("apt-config dump failed")
 	}