test(tui): cover XML/HTML syntax token fallbacks

Author: CasualDeveloper

packages/opencode/test/cli/tui/theme.test.ts

@@ -0,0 +1,44 @@
+import { expect, test } from "bun:test"
+import { RGBA } from "@opentui/core"
+import { DEFAULT_THEMES, resolveTheme } from "../../../src/cli/cmd/tui/context/theme-resolver"
+
+test("resolveTheme falls back to legacy XML/HTML syntax colors", () => {
+  const theme = {
+    ...DEFAULT_THEMES.opencode,
+    theme: {
+      ...DEFAULT_THEMES.opencode.theme,
+    },
+  }
+
+  delete theme.theme.syntaxTag
+  delete theme.theme.syntaxAttribute
+  delete theme.theme.syntaxTagDelimiter
+
+  const resolved = resolveTheme(theme, "dark")
+
+  expect(resolved.syntaxTag).toBe(resolved.error)
+  expect(resolved.syntaxAttribute).toBe(resolved.syntaxKeyword)
+  expect(resolved.syntaxTagDelimiter).toBe(resolved.syntaxOperator)
+})
+
+test("resolveTheme honors explicit XML/HTML syntax tokens", () => {
+  const syntaxTag = RGBA.fromInts(10, 20, 30)
+  const syntaxAttribute = RGBA.fromInts(40, 50, 60)
+  const syntaxTagDelimiter = RGBA.fromInts(70, 80, 90)
+
+  const theme = {
+    ...DEFAULT_THEMES.opencode,
+    theme: {
+      ...DEFAULT_THEMES.opencode.theme,
+      syntaxTag,
+      syntaxAttribute,
+      syntaxTagDelimiter,
+    },
+  }
+
+  const resolved = resolveTheme(theme, "dark")
+
+  expect(resolved.syntaxTag).toBe(syntaxTag)
+  expect(resolved.syntaxAttribute).toBe(syntaxAttribute)
+  expect(resolved.syntaxTagDelimiter).toBe(syntaxTagDelimiter)
+})