feat(config): add experimental.hashline_edit flag and provider state module

src/tools/hashline-edit/validation.test.ts

@@ -0,0 +1,105 @@
+import { describe, it, expect } from "bun:test"
+import { parseLineRef, validateLineRef } from "./validation"
+
+describe("parseLineRef", () => {
+  it("parses valid line reference", () => {
+    //#given
+    const ref = "42:a3"
+
+    //#when
+    const result = parseLineRef(ref)
+
+    //#then
+    expect(result).toEqual({ line: 42, hash: "a3" })
+  })
+
+  it("parses line reference with different hash", () => {
+    //#given
+    const ref = "1:ff"
+
+    //#when
+    const result = parseLineRef(ref)
+
+    //#then
+    expect(result).toEqual({ line: 1, hash: "ff" })
+  })
+
+  it("throws on invalid format - no colon", () => {
+    //#given
+    const ref = "42a3"
+
+    //#when & #then
+    expect(() => parseLineRef(ref)).toThrow()
+  })
+
+  it("throws on invalid format - non-numeric line", () => {
+    //#given
+    const ref = "abc:a3"
+
+    //#when & #then
+    expect(() => parseLineRef(ref)).toThrow()
+  })
+
+  it("throws on invalid format - invalid hash", () => {
+    //#given
+    const ref = "42:xyz"
+
+    //#when & #then
+    expect(() => parseLineRef(ref)).toThrow()
+  })
+
+  it("throws on empty string", () => {
+    //#given
+    const ref = ""
+
+    //#when & #then
+    expect(() => parseLineRef(ref)).toThrow()
+  })
+})
+
+describe("validateLineRef", () => {
+  it("validates matching hash", () => {
+    //#given
+    const lines = ["function hello() {", "  return 42", "}"]
+    const ref = "1:42"
+
+    //#when & #then
+    expect(() => validateLineRef(lines, ref)).not.toThrow()
+  })
+
+  it("throws on hash mismatch", () => {
+    //#given
+    const lines = ["function hello() {", "  return 42", "}"]
+    const ref = "1:00" // Wrong hash
+
+    //#when & #then
+    expect(() => validateLineRef(lines, ref)).toThrow()
+  })
+
+  it("throws on line out of bounds", () => {
+    //#given
+    const lines = ["function hello() {", "  return 42", "}"]
+    const ref = "99:a3"
+
+    //#when & #then
+    expect(() => validateLineRef(lines, ref)).toThrow()
+  })
+
+  it("throws on invalid line number", () => {
+    //#given
+    const lines = ["function hello() {"]
+    const ref = "0:a3" // Line numbers start at 1
+
+    //#when & #then
+    expect(() => validateLineRef(lines, ref)).toThrow()
+  })
+
+  it("error message includes current hash", () => {
+    //#given
+    const lines = ["function hello() {"]
+    const ref = "1:00"
+
+    //#when & #then
+    expect(() => validateLineRef(lines, ref)).toThrow(/current hash/)
+  })
+})