test(functions): add unit tests for functions module (#1337)

* test(functions): add unit tests for functions module

Add comprehensive unit tests for CopilotChat.functions covering uri_to_url,
match_uri, parse_schema, and parse_input. This improves test coverage and
ensures correct behavior for URI parsing and schema handling.

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---------

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Author: deathbeam

tests/functions_spec.lua

@@ -0,0 +1,62 @@
+local functions = require('CopilotChat.functions')
+
+describe('CopilotChat.functions', function()
+  describe('uri_to_url', function()
+    it('replaces parameters in uri template', function()
+      local uri = 'file://{path}'
+      local input = { path = '/tmp/test.txt' }
+      assert.equals('file:///tmp/test.txt', functions.uri_to_url(uri, input))
+    end)
+    it('leaves missing params empty', function()
+      local uri = 'file://{path}/{id}'
+      local input = { path = '/tmp' }
+      assert.equals('file:///tmp/', functions.uri_to_url(uri, input))
+    end)
+  end)
+
+  describe('match_uri', function()
+    it('matches uri and extracts parameters', function()
+      local uri = 'file:///tmp/test.txt'
+      local pattern = 'file://{path}'
+      local result = functions.match_uri(uri, pattern)
+      assert.are.same({ path = '/tmp/test.txt' }, result)
+    end)
+    it('returns nil for non-matching uri', function()
+      assert.is_nil(functions.match_uri('abc', 'file://{path}'))
+    end)
+    it('returns empty table for exact match with no params', function()
+      assert.are.same({}, functions.match_uri('abc', 'abc'))
+    end)
+  end)
+
+  describe('parse_schema', function()
+    it('returns schema if present', function()
+      local fn = { schema = { type = 'object', properties = { foo = { type = 'string' } } } }
+      assert.equals(fn.schema, functions.parse_schema(fn))
+    end)
+    it('generates schema from uri if missing', function()
+      local fn = { uri = 'file://{path}/{id}' }
+      local schema = functions.parse_schema(fn)
+      assert.are.same({
+        type = 'object',
+        properties = { path = { type = 'string' }, id = { type = 'string' } },
+        required = { 'path', 'id' },
+      }, schema)
+    end)
+  end)
+
+  describe('parse_input', function()
+    it('parses input string into table', function()
+      local schema = { properties = { a = {}, b = {} }, required = { 'a', 'b' } }
+      local input = 'foo;;bar'
+      assert.are.same({ a = 'foo', b = 'bar' }, functions.parse_input(input, schema))
+    end)
+    it('returns input if already table', function()
+      local input = { a = 1 }
+      assert.equals(input, functions.parse_input(input))
+    end)
+    it('returns empty table if no schema', function()
+      assert.are.same({}, functions.parse_input('foo'))
+    end)
+  end)
+end)

tests/init_spec.lua

@@ -4,6 +4,7 @@ describe('CopilotChat module', function()
       require('CopilotChat')
     end)
   end)
+
   it('should be able to set up', function()
     assert.has_no.errors(function()
       require('CopilotChat').setup({})