diff --git a/ts/binary_search.test.ts b/ts/binary_search.test.ts
new file mode 100644
index 0000000..983ce6a
--- /dev/null
+++ b/ts/binary_search.test.ts
@@ -0,0 +1,28 @@
+function binary_search(haystack: number[], needle: number): boolean {
+	let lo = 0;
+	let hi = haystack.length;
+
+	while (lo < hi) {
+		const m = Math.floor(lo + (hi - lo) / 2);
+		const v = haystack[m];
+
+		if (v === needle) {
+			return true;
+		} else if (v > needle) {
+		 	hi = m;
+		} else {
+			lo = m + 1;
+		}
+	}
+	return false;
+}
+
+test("test binary search", () => {
+	expect(binary_search([1, 2, 3, 4, 5, 6], 5)).toBe(true);
+
+})
+
+test("test binary search can return false", () => {
+	expect(binary_search([1, 2, 3, 4, 5, 6], 50)).toBe(false);
+
+})
diff --git a/ts/bubble_sort.test.ts b/ts/bubble_sort.test.ts
new file mode 100644
index 0000000..197ad01
--- /dev/null
+++ b/ts/bubble_sort.test.ts
@@ -0,0 +1,18 @@
+function bubble_sort(arr: number[]): void {
+    for (let i = 0; i < arr.length; i++) {
+        for (let j = 0; j < arr.length - 1; j++) {
+            if (arr[j] > arr[j + 1]) {
+                const t = arr[j+1];
+                arr[j+1] = arr[j];
+                arr[j] = t;
+
+            }
+        }
+    }
+}
+
+test("bubble sort works", () => {
+    const a = [2, 1, 3, 4, 5];
+    bubble_sort(a);
+    expect(a).toEqual([1, 2, 3, 4, 5]);
+})
\ No newline at end of file
diff --git a/ts/linear_search.test.ts b/ts/linear_search.test.ts
new file mode 100644
index 0000000..bb8d25f
--- /dev/null
+++ b/ts/linear_search.test.ts
@@ -0,0 +1,12 @@
+function linear_search(haystack: number[], needle: number): boolean {
+	for (let i = 0; i < haystack.length; i++) {
+		if (haystack[i] === needle) {
+			return true;
+		}
+	}
+	return false;
+}
+
+test("test linear search", () => {
+	expect(linear_search([1, 2, 3, 4, 5], 3)).toBe(true);
+})