Tests for language & reducer utils

tests/utils/language.test.ts

@@ -0,0 +1,46 @@
+import faker from "faker";
+import { replaceBoth, retrieveFiltered } from "../../utils/language";
+import { languages, exceptions, mappings } from "../../utils/languages.json";
+
+describe("replaceBoth", () => {
+    it("replaces excepted sources correctly", () => {
+        Object.entries(exceptions.source).forEach(([code, replacement]) => {
+            const { source } = replaceBoth("exception", { source: code, target: "" })
+            expect(source).toBe(replacement);
+        });
+    });
+
+    it("replaces excepted targets correctly", () => {
+        Object.entries(exceptions.target).forEach(([code, replacement]) => {
+            const { target } = replaceBoth("exception", { source: "", target: code })
+            expect(target).toBe(replacement);
+        });
+    });
+
+    it("replaces mapped sources correctly", () => {
+        Object.entries(mappings.source).forEach(([code, replacement]) => {
+            const { source } = replaceBoth("mapping", { source: code, target: "" })
+            expect(source).toBe(replacement);
+        });
+    });
+
+    it("replaces mapped targets correctly", () => {
+        Object.entries(mappings.target).forEach(([code, replacement]) => {
+            const { target } = replaceBoth("mapping", { source: "", target: code })
+            expect(target).toBe(replacement);
+        });
+    });
+});
+
+describe("retrieveFiltered", () => {
+    it("filters by exceptions & by opposite values", () => {
+        const source = faker.random.locale();
+        const target = faker.random.locale();
+        const sourceKeys = Object.keys(languages).filter(code => !Object.keys(exceptions.source).includes(code) && code !== target);
+        const targetKeys = Object.keys(languages).filter(code => !Object.keys(exceptions.target).includes(code) && code !== source);
+
+        const { sourceLangs, targetLangs } = retrieveFiltered(source, target);
+        expect(sourceLangs.map(([code]) => code)).toStrictEqual(sourceKeys);
+        expect(targetLangs.map(([code]) => code)).toStrictEqual(targetKeys);
+    });
+});