Roll some unit tests..

tests/testthat.R

@@ -0,0 +1,4 @@
+library(testthat)
+library(searcher)
+
+test_check("searcher")

tests/testthat/test-searcher.R

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+context("searcher")
+
+test_that("Check link generation", {
+
+  ##### Google
+
+  expect_identical(
+    search_google("toad"),
+    "https://google.com/search?q=toad"
+  )
+
+  ##### Bing
+
+  expect_identical(
+    search_bing("toad"),
+    "https://bing.com/search?q=toad"
+  )
+
+  ##### DDG
+
+  expect_identical(
+    search_duckduckgo("toad"),
+    "https://duckduckgo.com/?q=toad"
+  )
+
+  ##### StackOverflow
+
+  expect_identical(
+    search_stackoverflow("toad"),
+    "https://stackoverflow.com/search?q=toad%20[r]"
+  )
+
+  expect_identical(
+    search_stackoverflow("toad", rlang = FALSE),
+    "https://stackoverflow.com/search?q=toad"
+  )
+
+  ##### GitHub
+
+  expect_identical(
+    search_github("toad"),
+    "https://github.com/search?q=toad%20language:r%20type:issue&type=Issues"
+  )
+
+  expect_identical(
+    search_github("toad", rlang = FALSE),
+    "https://github.com/search?q=toad&type=Issues"
+  )
+
+  ##### BitBucket
+
+  expect_identical(
+    search_bitbucket("toad"),
+    "https://bitbucket.com/search?q=toad%20lang:r"
+  )
+
+  expect_identical(
+    search_bitbucket("toad", rlang = FALSE),
+    "https://bitbucket.com/search?q=toad"
+  )
+
+})
+
+
+test_that("Malformed search query validation", {
+  expect_identical(
+    search_google(""),
+    "",
+    "Empty string check if no error messages"
+  )
+
+  expect_identical(
+    search_google(NULL),
+    "",
+    "NULL value handling"
+  )
+})