test_that("can override url", {
  req <- request("http://example.com/")
  expect_equal(req_url(req, "http://foo.com:10")$url, "http://foo.com:10")
})

test_that("automatically adds /", {
  req1 <- request("http://example.com")
  req2 <- request("http://example.com/")

  expect_equal(req_url_path(req1, "/index.html")$url, "http://example.com/index.html")
  expect_equal(req_url_path(req1, "index.html")$url, "http://example.com/index.html")
  expect_equal(req_url_path(req2, "/index.html")$url, "http://example.com/index.html")
  expect_equal(req_url_path(req2, "index.html")$url, "http://example.com/index.html")

  expect_equal(req_url_path_append(req1, "index.html")$url, "http://example.com/index.html")
  expect_equal(req_url_path_append(req1, "/index.html")$url, "http://example.com/index.html")
  expect_equal(req_url_path_append(req2, "index.html")$url, "http://example.com/index.html")
  expect_equal(req_url_path_append(req2, "/index.html")$url, "http://example.com/index.html")
})

test_that("can append multiple components", {
  req <- request("http://example.com/x")
  expect_equal(req_url_path(req, "a", "b")$url, "http://example.com/a/b")
  expect_equal(req_url_path_append(req, "a", "b")$url, "http://example.com/x/a/b")
})

test_that("can handle empty path", {
  req <- request("http://example.com/x")
  expect_equal(req_url_path(req)$url, "http://example.com")
  expect_equal(req_url_path_append(req)$url, "http://example.com/x")
  expect_equal(req_url_path(req, NULL)$url, "http://example.com")
  expect_equal(req_url_path_append(req, NULL)$url, "http://example.com/x")

  expect_equal(req_url_path(req, "")$url, "http://example.com")
  expect_equal(req_url_path_append(req, "")$url, "http://example.com/x")
})

test_that("can handle path vector", {
  req <- request("http://example.com/x")
  expect_equal(req_url_path(req, c("a", "b"))$url, "http://example.com/a/b")
  expect_equal(req_url_path_append(req, c("a", "b"))$url, "http://example.com/x/a/b")
  expect_equal(req_url_path_append(req, c("a", "b"), NULL)$url, "http://example.com/x/a/b")
})

test_that("can set query params", {
  req <- request("http://example.com/")
  expect_equal(req_url_query(req, a = 1, b = 2)$url, "http://example.com/?a=1&b=2")
  expect_equal(req_url_query(req, a = 1, b = 2, c = NULL)$url, "http://example.com/?a=1&b=2")
  expect_equal(req_url_query(req, !!!list(a = 1, b = 2))$url, "http://example.com/?a=1&b=2")

  expect_equal(req_url_query(req, a = 1, a = 2)$url, "http://example.com/?a=1&a=2")
  expect_equal(req_url_query(req, !!!list(a = 1, a = 2))$url, "http://example.com/?a=1&a=2")
})

test_that("empty query doesn't affect url", {
  req <- request("http://example.com/")
  expect_equal(req_url_query(req)$url, "http://example.com/")
  expect_equal(req_url_query(req, a = NULL)$url, "http://example.com/")
})

test_that("can modify query params iteratively", {
  req <- request("http://example.com/?a=1&b=2")
  expect_equal(req_url_query(req, c = 3)$url, "http://example.com/?a=1&b=2&c=3")
  expect_equal(req_url_query(req, a = 2)$url, "http://example.com/?b=2&a=2")
  expect_equal(req_url_query(req, a = 1, a = 2)$url, "http://example.com/?b=2&a=1&a=2")
  expect_equal(req_url_query(req, b = NULL)$url, "http://example.com/?a=1")
})

test_that("can opt-out of query escaping", {
  req <- request("http://example.com/")
  expect_equal(req_url_query(req, a = I(","))$url, "http://example.com/?a=,")
})

test_that("query components must be length 1", {
  expect_snapshot(error = TRUE, {
    req <- request("http://example.com/")
    req %>% req_url_query(a = mean)
    req %>% req_url_query(a = letters)
  })
})