update: automatically adjust number of materials in the test

tests/js/material.test.ts

@@ -1,4 +1,6 @@
 import { expect } from "chai";
+import * as fs from "fs";
+import * as yaml from "js-yaml";
 
 import h_BN from "../../materials/BN-[Hexagonal_Boron_Nitride]-HEX_[P6%2Fmmm]_2D_[Monolayer]-[2dm-4991].json";
 import Graphene from "../../materials/C-[Graphene]-HEX_[P6%2Fmmm]_2D_[Monolayer]-[2dm-3993].json";
@@ -7,7 +9,20 @@ import Si from "../../materials/Si-[Silicon]-FCC_[Fd-3m]_3D_[Bulk]-[mp-149].json
 import WS2 from "../../materials/WS2-[Tungsten_Disulfide]-HEX_[P-6m2]_2D_[Monolayer]-[2dm-3749].json";
 import { MaterialStandata } from "../../src/js";
 
-const TOTAL_NUMBER_OF_MATERIALS = 30;
+function countEntitiesInYAML(filePath: string, entityKey: string): number {
+    try {
+        const fileContents = fs.readFileSync(filePath, "utf8");
+        const data = yaml.load(fileContents) as { [key: string]: any[] };
+        return data[entityKey]?.length || 0;
+    } catch (e) {
+        console.error(e);
+        return 0;
+    }
+}
+
+const materialsCategoriesFilePath = "materials/categories.yml";
+const TOTAL_NUMBER_OF_MATERIALS = countEntitiesInYAML(materialsCategoriesFilePath, "entities");
+console.log(`Total number of materials: ${TOTAL_NUMBER_OF_MATERIALS}`);
 
 describe("Materials Standata", () => {
     it("can return the list of all materials", () => {