fix(actions): prev_hunk works with wrap on line 1

Fixes #806

lua/gitsigns/hunks.lua

@@ -336,7 +336,7 @@ function M.find_nearest_hunk(lnum, hunks, forwards, wrap)
   else
     for i = #hunks, 1, -1 do
       local hunk = hunks[i]
-      local dist = lnum - hunk.vend
+      local dist = lnum - math.max(hunk.vend, 1)
       if dist > 0 and dist < distance then
         distance = dist
         ret = hunk

test/actions_spec.lua

@@ -30,18 +30,20 @@ local function expect_hunks(exp_hunks)
         #exp_hunks,
         #hunks
       )
-      msg[#msg + 1] = ''
-      msg[#msg + 1] = 'Expected hunks:'
+
+      msg[#msg + 1] = '\nExpected hunks:'
       for _, h in ipairs(exp_hunks) do
-        msg[#msg + 1] = h.head
+        msg[#msg + 1] = h
       end
-      msg[#msg + 1] = ''
-      msg[#msg + 1] = 'Passed in hunks:'
+
+      msg[#msg + 1] = '\nPassed in hunks:'
       for _, h in ipairs(hunks) do
         msg[#msg + 1] = h.head
       end
+
       error(table.concat(msg, '\n'))
     end
+
     for i, hunk in ipairs(hunks) do
       eq(exp_hunks[i], hunk.head)
     end
@@ -60,10 +62,6 @@ describe('actions', function()
     setup_gitsigns(config)
   end)
 
-  after_each(function()
-    -- helpers.cleanup()
-  end)
-
   it('works with commands', function()
     setup_test_repo()
     edit(test_file)
@@ -125,16 +123,7 @@ describe('actions', function()
     end)
 
     local function set_lines(start, dend, lines)
-      exec_lua(
-        [[
-        local start, dend, lines = ...
-        vim.api.nvim_buf_set_lines(0, start, dend, false, lines)
-      ]],
-        start,
-        dend,
-        lines
-      )
-      -- command('write')
+      helpers.api.nvim_buf_set_lines(0, start, dend, false, lines)
     end
 
     describe('can stage add hunks', function()
@@ -246,4 +235,39 @@ describe('actions', function()
       expect_hunks({})
     end)
   end)
+
+  it('can navigate hunks', function()
+    setup_test_repo()
+    edit(test_file)
+
+    feed('dd')
+    feed('4Gx')
+    feed('6Gx')
+
+    expect_hunks({
+      '@@ -1,1 +0 @@',
+      '@@ -5,1 +4,1 @@',
+      '@@ -7,1 +6,1 @@',
+    })
+
+    local function check_cursor(pos)
+      eq(pos, helpers.api.nvim_win_get_cursor(0))
+    end
+
+    check_cursor({6,0})
+    command('Gitsigns next_hunk') -- Wrap
+    check_cursor({1,0})
+    command('Gitsigns next_hunk')
+    check_cursor({4,0})
+    command('Gitsigns next_hunk')
+    check_cursor({6,0})
+
+    command('Gitsigns prev_hunk')
+    check_cursor({4,0})
+    command('Gitsigns prev_hunk')
+    check_cursor({1,0})
+    command('Gitsigns prev_hunk') -- Wrap
+    check_cursor({6,0})
+
+  end)
 end)