Add cursor moving (#19)

frontend/obsidian-plugin/src/utils/line-and-column-to-position.test.ts

@@ -0,0 +1,43 @@
+import { lineAndColumnToPosition } from "./line-and-column-to-position";
+
+describe("lineAndColumnToPosition", () => {
+	it("should return the correct position for the first line", () => {
+		const text = "Hello\nWorld";
+		const position = lineAndColumnToPosition(text, 0, 3);
+		expect(position).toBe(3);
+	});
+
+	it("should return the correct position for the second line", () => {
+		const text = "Hello\nWorld";
+		const position = lineAndColumnToPosition(text, 1, 2);
+		expect(position).toBe(8);
+	});
+
+	it("should return the correct position for an empty string", () => {
+		const text = "";
+		const position = lineAndColumnToPosition(text, 0, 0);
+		expect(position).toBe(0);
+	});
+
+	it("should handle a single-line string correctly", () => {
+		const text = "SingleLine";
+		const position = lineAndColumnToPosition(text, 0, 5);
+		expect(position).toBe(5);
+	});
+
+	it("should handle multi-line strings with varying lengths", () => {
+		const text = "Line1\nLongerLine2\nShort3";
+		const position = lineAndColumnToPosition(text, 2, 4);
+		expect(position).toBe(22);
+	});
+
+	it("should throw an error if the line number is out of range", () => {
+		const text = "Line1\nLine2";
+		expect(() => lineAndColumnToPosition(text, 3, 0)).toThrow();
+	});
+
+	it("should throw an error if the column number is out of range", () => {
+		const text = "Line1\nLine2";
+		expect(() => lineAndColumnToPosition(text, 1, 10)).toThrow();
+	});
+});