diff --git a/src/features/boards/board.tsx b/src/features/boards/board.tsx
index 845f96d..9912c2f 100644
--- a/src/features/boards/board.tsx
+++ b/src/features/boards/board.tsx
@@ -418,6 +418,7 @@ export function placeInAvailableSpace<T extends NodePosition>(
                 : Math.abs(nodeToPlace.y - nodeToCheck.y);
 
         // If we're too close to this node, move further
+        // Keep in mind positions start at top right, so "down" means increasing Y
         if (distance < radius) {
             if (direction === Direction.Right) {
                 nodeToPlace.x = nodeToCheck.x + radius;
diff --git a/tests/features/board.test.ts b/tests/features/board.test.ts
new file mode 100644
index 0000000..6aa0cad
--- /dev/null
+++ b/tests/features/board.test.ts
@@ -0,0 +1,108 @@
+import {
+    NodePosition,
+    placeInAvailableSpace,
+    setupUniqueIds,
+    unwrapNodeRef
+} from "features/boards/board";
+import { beforeEach, describe, expect, test } from "vitest";
+import { Ref, ref } from "vue";
+import "../utils";
+import { Direction } from "util/common";
+
+describe("Unwraps node refs", () => {
+    test("Static value", () => expect(unwrapNodeRef(100, {})).toBe(100));
+    test("Ref value", () => expect(unwrapNodeRef(ref(100), {})).toBe(100));
+    test("0 param function value", () => expect(unwrapNodeRef(() => 100, {})).toBe(100));
+    test("1 param function value", () => {
+        const actualNode = { foo: "bar" };
+        expect(
+            unwrapNodeRef(function (node) {
+                if (node === actualNode) {
+                    return true;
+                }
+                return false;
+            }, actualNode)
+        ).toBe(true);
+    });
+});
+
+describe("Set up unique IDs", () => {
+    let nodes: Ref<{ id: number }[]>, nextId: Ref<number>;
+    beforeEach(() => {
+        nodes = ref([]);
+        nextId = setupUniqueIds(nodes);
+    });
+    test("Starts at 0", () => expect(nextId?.value).toBe(0));
+    test("Calculates initial value properly", () => {
+        nodes.value = [{ id: 0 }, { id: 1 }, { id: 2 }];
+        expect(nextId.value).toBe(3);
+    });
+    test("Non consecutive IDs", () => {
+        nodes.value = [{ id: -5 }, { id: 0 }, { id: 200 }];
+        expect(nextId.value).toBe(201);
+    });
+    test("After modification", () => {
+        nodes.value = [{ id: 0 }, { id: 1 }, { id: 2 }];
+        nodes.value.push({ id: nextId.value });
+        expect(nextId.value).toBe(4);
+    });
+});
+
+describe("Place in available space", () => {
+    let nodes: Ref<NodePosition[]>, node: NodePosition;
+    beforeEach(() => {
+        nodes = ref([]);
+        node = { x: 10, y: 20 };
+    });
+    test("No nodes", () => {
+        placeInAvailableSpace(node, nodes.value);
+        expect(node).toMatchObject({ x: 10, y: 20 });
+    });
+    test("Moves node", () => {
+        nodes.value = [{ x: 10, y: 20 }];
+        placeInAvailableSpace(node, nodes.value);
+        expect(node).not.toMatchObject({ x: 10, y: 20 });
+    });
+    describe("Respects radius", () => {
+        test("Positions radius away", () => {
+            nodes.value = [{ x: 10, y: 20 }];
+            placeInAvailableSpace(node, nodes.value, 32);
+            expect(node).toMatchObject({ x: 42, y: 20 });
+        });
+        test("Ignores node already radius away", () => {
+            nodes.value = [{ x: 42, y: 20 }];
+            placeInAvailableSpace(node, nodes.value, 32);
+            expect(node).toMatchObject({ x: 10, y: 20 });
+        });
+        test("Doesn't ignore node just under radius away", () => {
+            nodes.value = [{ x: 41, y: 20 }];
+            placeInAvailableSpace(node, nodes.value, 32);
+            expect(node).not.toMatchObject({ x: 10, y: 20 });
+        });
+    });
+    describe("Respects direction", () => {
+        test("Goes left", () => {
+            nodes.value = [{ x: 10, y: 20 }];
+            placeInAvailableSpace(node, nodes.value, 10, Direction.Left);
+            expect(node).toMatchObject({ x: 0, y: 20 });
+        });
+        test("Goes up", () => {
+            nodes.value = [{ x: 10, y: 20 }];
+            placeInAvailableSpace(node, nodes.value, 10, Direction.Up);
+            expect(node).toMatchObject({ x: 10, y: 10 });
+        });
+        test("Goes down", () => {
+            nodes.value = [{ x: 10, y: 20 }];
+            placeInAvailableSpace(node, nodes.value, 10, Direction.Down);
+            expect(node).toMatchObject({ x: 10, y: 30 });
+        });
+    });
+    test("Finds hole", () => {
+        nodes.value = [
+            { x: 10, y: 20 },
+            { x: 30, y: 20 }
+        ];
+        placeInAvailableSpace(node, nodes.value, 10);
+        expect(node).toMatchObject({ x: 20, y: 20 });
+    });
+});