1 files changed, 76 insertions, 0 deletions
diff --git a/properties/main_test.ts b/properties/main_test.ts
new file mode 100644
index 0000000..669e1d9
--- /dev/null
+++ b/properties/main_test.ts
@@ -0,0 +1,76 @@
+import fc from "https://cdn.skypack.dev/fast-check";
+import PMap from "../build/dev/javascript/gleam_stdlib/persistent-hash-map.mjs";
+
+const options = Object.freeze({
+  numRuns: 1000_000,
+});
+
+Deno.test("all inserted numbers must exist within", () => {
+  const property = (numbers: Array<number>) => {
+    let map = PMap.new();
+
+    // Insert all numbers
+    for (const number of numbers) {
+      map = map.set(number, 1);
+    }
+
+    // Check that all numbers are in the map
+    for (const number of numbers) {
+      if (!map.has(number)) {
+        console.log(`Number ${number} not found`);
+        return false;
+      }
+    }
+  };
+
+  const arbitrary = fc.array(fc.integer());
+  fc.assert(fc.property(arbitrary, property), options);
+});
+
+Deno.test("all inserted values can be got", () => {
+  const property = (numbers: Array<[number, number]>) => {
+    const reference = new Map();
+    let map = PMap.new();
+
+    // Insert all pairs
+    for (const [k, v] of numbers) {
+      reference.set(k, v);
+      map = map.set(k, v);
+    }
+
+    // Check that all keys have the correct value
+    for (const [k, _] of numbers) {
+      const expected = reference.get(k);
+      const found = map.get(k, undefined);
+      if (found !== expected) {
+        console.log(`${k} was ${found} not ${expected}`);
+        return false;
+      }
+    }
+  };
+
+  const arbitrary = fc.array(fc.tuple(fc.integer(), fc.integer()));
+  fc.assert(fc.property(arbitrary, property), options);
+});
+
+Deno.test("size", () => {
+  const property = (numbers: Array<number>) => {
+    const reference = new Map();
+    let map = PMap.new();
+
+    // Insert all values
+    for (const k of numbers) {
+      reference.set(k, 1);
+      map = map.set(k, 1);
+    }
+
+    // Map size should match reference
+    if (map.size !== reference.size) {
+      console.log(`size was ${map.size} not ${reference.size}`);
+      return false;
+    }
+  };
+
+  const arbitrary = fc.array(fc.integer());
+  fc.assert(fc.property(arbitrary, property), options);
+});