[chore] Add test to check all versioned detectors are non-zero (#2272)

pkg/engine/defaults_test.go

@@ -48,3 +48,20 @@ func TestDefaultDetectorTypesImplementing(t *testing.T) {
 		)
 	}
 }
+
+func TestDefaultVersionerDetectorsHaveNonZeroVersions(t *testing.T) {
+	// Loop through all our default detectors and find the ones that
+	// implement Versioner. Of those, check each version is not zero.
+	// This is required due to an implementation detail of filtering detectors.
+	// See: https://github.com/trufflesecurity/trufflehog/blob/v3.63.7/main.go#L624-L638
+	for _, detector := range DefaultDetectors() {
+		v, ok := detector.(detectors.Versioner)
+		if !ok || v.Version() != 0 {
+			continue
+		}
+		t.Errorf(
+			"detector %q implements Versioner that returns a zero version",
+			detectorspb.DetectorType_name[int32(detector.Type())],
+		)
+	}
+}