tests: add tests for go handler

.gitmodules

@@ -6,3 +6,7 @@
 	path = test/vendor/plenary.nvim
 	url = https://github.com/nvim-lua/plenary.nvim
   ignore = dirty
+[submodule "test/vendor/nvim-treesitter"]
+	path = test/vendor/nvim-treesitter
+	url = https://github.com/nvim-treesitter/nvim-treesitter
+  ignore = dirty

test/fixtures/test.go

@@ -0,0 +1,10 @@
+package main
+
+import "fmt"
+
+import myio "io"
+
+import (
+	"github.com/joho/godotenv"
+	corev1 "k8s.io/api/core/v1"
+)

test/spec.vim

@@ -1,5 +1,6 @@
 set rtp^=test/vendor/plenary.nvim/
 set rtp^=test/vendor/matcher_combinators.lua/
+set rtp^=test/vendor/nvim-treesitter/
 set rtp^=./
 
 runtime plugin/plenary.vim
@@ -11,3 +12,6 @@ lua require('matcher_combinators.luassert')
 runtime plugin/gx.lua
 " lua require('gx').setup({ name = 'Jane Doe' })
 lua require('gx').setup()
+
+" needed for go handler testing
+lua require('nvim-treesitter.configs').setup({ ensure_installed = { "go" }, sync_install = true })

test/spec/gx/handlers/go_handler_spec.lua

@@ -0,0 +1,23 @@
+local handler = require("gx.handlers.go")
+
+describe("go handler works", function()
+  vim.cmd("edit test/fixtures/test.go")
+  local function test_line(line, startpos, endpos, expected)
+    for i = startpos, endpos do
+      vim.api.nvim_win_set_cursor(0, { line, i })
+      assert.equals(expected, handler.handle())
+    end
+  end
+  it("parses single line imports", function()
+    test_line(3, 0, 11, "https://pkg.go.dev/fmt")
+  end)
+  it("parses single line named imports", function()
+    test_line(5, 0, 15, "https://pkg.go.dev/io")
+  end)
+  it("parses imports in list", function()
+    test_line(8, 1, 26, "https://pkg.go.dev/github.com/joho/godotenv")
+  end)
+  it("parses named imports in list", function()
+    test_line(9, 1, 27, "https://pkg.go.dev/k8s.io/api/core/v1")
+  end)
+end)