Made a reader for Fabric metadata

src/loaders/fabric/fabric-metadata-reader.ts

@@ -0,0 +1,15 @@
+import { ZippedTextLoaderMetadataReader } from "@/loaders/zipped-loader-metadata-reader";
+import { FabricMetadata } from "./fabric-metadata";
+import { FABRIC_MOD_JSON, RawFabricMetadata } from "./raw-fabric-metadata";
+
+/**
+ * A metadata reader that is able to read Fabric mod metadata from a zipped file.
+ */
+export class FabricMetadataReader extends ZippedTextLoaderMetadataReader<FabricMetadata, RawFabricMetadata> {
+    /**
+     * Constructs a new {@link FabricMetadataReader} instance.
+     */
+    constructor() {
+        super(FABRIC_MOD_JSON, FabricMetadata.from, JSON.parse);
+    }
+}

tests/unit/loaders/fabric/fabric-metadata-reader.spec.ts

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+import { zipFile } from "@/../tests/utils/zip-utils";
+import mockFs from "mock-fs";
+import { FabricMetadata } from "@/loaders/fabric/fabric-metadata";
+import { FabricMetadataReader } from "@/loaders/fabric/fabric-metadata-reader";
+
+beforeEach(async () => {
+    mockFs({
+        "fabric.mod.jar": await zipFile([__dirname, "../../../content/fabric/fabric.mod.json"]),
+        "text.txt": "",
+    });
+});
+
+afterEach(() => {
+    mockFs.restore();
+});
+
+describe("FabricMetadataReader", () => {
+    test("successfully reads fabric.mod.json", async () => {
+        const reader = new FabricMetadataReader();
+
+        const metadata = await reader.readMetadataFile("fabric.mod.jar");
+
+        expect(metadata).toBeInstanceOf(FabricMetadata);
+    });
+
+    test("returns undefined if file is not a Fabric mod", async () => {
+        const reader = new FabricMetadataReader();
+
+        const metadata = await reader.readMetadataFile("text.txt");
+
+        expect(metadata).toBeUndefined();
+    });
+
+    test("returns undefined if file does not exist", async () => {
+        const reader = new FabricMetadataReader();
+
+        const metadata = await reader.readMetadataFile("text.json");
+
+        expect(metadata).toBeUndefined();
+    });
+});