test: improve code coverage

Author: anonrig

test/parse.test.ts

@@ -35,3 +35,7 @@ test("should accept pairs with missing values", () => {
   assert.deepEqual(qs.parse("foo=bar&hey"), { foo: "bar", hey: "" });
   assert.deepEqual(qs.parse("hey"), { hey: "" });
 });
+
+test("should decode key", () => {
+  assert.deepEqual(qs.parse("full%20name=Yagiz"), { "full name": "Yagiz" });
+});

test/stringify.test.ts

@@ -16,3 +16,35 @@ test("native querystring module should match the test suite result", () => {
     (t) => assert.deepEqual(querystring.stringify(t[1]), t[0]),
   );
 });
+
+test("should handle numbers", () => {
+  assert.deepEqual(
+    qs.stringify({ age: 5, name: "John Doe" }),
+    "age=5&name=John%20Doe",
+  );
+});
+
+test("should handle BigInt", () => {
+  assert.deepEqual(
+    qs.stringify({ age: BigInt(55), name: "John" }),
+    "age=55&name=John",
+  );
+});
+
+test("should handle boolean values", () => {
+  assert.deepEqual(qs.stringify({ valid: true }), "valid=true");
+  assert.deepEqual(qs.stringify({ valid: false }), "valid=false");
+});
+
+test("should handle numbers", () => {
+  assert.deepEqual(qs.stringify({ value: 1e22 }), "value=1e%2B22");
+});
+
+test("should omit objects", () => {
+  // This aligns with querystring module
+  assert.deepEqual(qs.stringify({ user: {} }), "user=");
+});
+
+test("should omit non-object inputs", () => {
+  assert.deepEqual(qs.stringify("hello" as any), "");
+});