code: List<ScmMaterialConfig> getScmMaterials() {
          List<ScmMaterialConfig> scmMaterials = new ArrayList<>();
          for (FanInNode node : nodes.values()) {
              if (node.materialConfig instanceof ScmMaterialConfig) {
                  scmMaterials.add((ScmMaterialConfig) node.materialConfig);
              }
          }
          return scmMaterials;
      }
docs: Used in test Only