1 files changed, 34 insertions, 0 deletions
diff --git a/tests/type-consistency/spec/mapReduce.ts b/tests/type-consistency/spec/mapReduce.ts
new file mode 100644
index 0000000..b5077ff
--- /dev/null
+++ b/tests/type-consistency/spec/mapReduce.ts
@@ -0,0 +1,34 @@
+import path from "path";
+import { createTestHarness } from "../harness";
+
+export default createTestHarness({
+  harnessName: "Map reduce",
+  generatedPath: path.join(__dirname, "..", "generated"),
+})
+  .createFunctionTest({
+    name: "Map: numbers to string",
+    program: "fn(a, map(a, fn(n, tostring(n))))",
+    cases: [
+      { input: [1, 2, 3], output: ["1", "2", "3"] },
+      { input: [50], output: ["50"] },
+      { input: [], output: [] },
+    ],
+  })
+  .createFunctionTest({
+    name: "Reduce: array length",
+    program: "fn(a, reduce(a, fn(acc, add(acc, 1)), 0))",
+    cases: [
+      { input: [1, 2, 3], output: 3 },
+      { input: ["hello", ["hello", "world"]], output: 2 },
+      { input: [], output: 0 },
+    ],
+  })
+  .createFunctionTest({
+    name: "Reduce: sum of numbers times index",
+    program: "fn(a, reduce(a, fn(acc, cur, idx, add(acc, mul(cur, idx))), 0))",
+    cases: [
+      { input: [1, 2, 3], output: 8 },
+      { input: [], output: 0 },
+      { input: [50, 10, 0], output: 10 },
+    ],
+  });