add tests for arrays

bau/test/state-array.test.js

@@ -21,12 +21,64 @@ describe("state array", async () => {
     const state = bau.state([1]);
     state.val = [2];
   });
-  it("push one", () => {
-    const state = bau.state([1]);
-    state.val.push(2);
+  it("push", () => {
+    const state = bau.state([]);
+    assert.equal(state.val.length, 0);
+    // Push one
+    state.val.push("banana");
+    assert.equal(state.val.length, 1);
+    assert.equal(state.val[0], "banana");
+    // Push multiple
+    state.val.push("mango", "grape");
+    assert.equal(state.val.length, 3);
+    assert.equal(state.val[2], "grape");
   });
-  it("push 2 elements", () => {
-    const state = bau.state([1]);
-    state.val.push(2, 3);
+  it("pop", () => {
+    // pop: remove the last element
+    const state = bau.state(["banana", "apple", "mango"]);
+    state.val.pop();
+    assert.equal(state.val.length, 2);
+  });
+  it("shift", () => {
+    // remove the first element
+    const state = bau.state(["banana", "apple", "mango"]);
+    state.val.shift();
+    assert.equal(state.val.length, 2);
+    assert.equal(state.val[0], "apple");
+  });
+  it("unshift", () => {
+    // unshift: add item at the front
+    const state = bau.state(["banana", "mango"]);
+    state.val.unshift("apple");
+    assert.equal(state.val.length, 3);
+    assert.equal(state.val[0], "apple");
+
+    // unshift: add item at the front
+    state.val.unshift("ananas", "melon");
+    assert.equal(state.val.length, 5);
+    assert.equal(state.val[0], "ananas");
+    assert.equal(state.val[1], "melon");
+  });
+  it("splice: remove one item", () => {
+    const state = bau.state(["banana", "apple", "mango"]);
+    state.val.splice(1, 1);
+    assert.equal(state.val.length, 2);
+    assert.equal(state.val[1], "mango");
+  });
+  it("splice: remove the last 2", () => {
+    const state = bau.state(["banana", "apple", "mango"]);
+    state.val.splice(-2, 2);
+    assert.equal(state.val.length, 1);
+    assert.equal(state.val[0], "banana");
+  });
+  it("sort", () => {
+    const state = bau.state(["banana", "apple"]);
+    state.val.sort();
+    assert.equal(state.val[0], "apple");
+  });
+  it("reverse", () => {
+    const state = bau.state(["banana", "apple"]);
+    state.val.reverse();
+    assert.equal(state.val[0], "apple");
   });
 });