Add tests for fractional infoview dimensions.

Refs: #406 (comment)

Author: Julian

spec/infoview/layout/horizontal_fractional_spec.lua

@@ -0,0 +1,25 @@
+---@brief [[
+--- Tests for infoview horizontal layout with fractional height.
+---@brief ]]
+
+local infoview = require 'lean.infoview'
+
+-- Emulate a 80x24 landscape display.
+vim.o.columns = 80
+vim.o.lines = 24
+
+require('lean').setup {
+  infoview = {
+    autoopen = false,
+    orientation = 'horizontal',
+    height = 0.5,
+  },
+}
+
+describe('infoview window fractional horizontal', function()
+  it('opens with fractional height', function()
+    infoview.open()
+    local height = infoview.get_current_infoview().window:height()
+    assert.is.equal(24 / 2, height)
+  end)
+end)

spec/infoview/layout/vertical_fractional_spec.lua

@@ -0,0 +1,25 @@
+---@brief [[
+--- Tests for infoview vertical layout with fractional width.
+---@brief ]]
+
+local infoview = require 'lean.infoview'
+
+-- Emulate a 80x24 portrait display.
+vim.o.columns = 80
+vim.o.lines = 24
+
+require('lean').setup {
+  infoview = {
+    autoopen = false,
+    orientation = 'vertical',
+    width = 1 / 2,
+  },
+}
+
+describe('infoview window fractional vertical', function()
+  it('opens with fractional width', function()
+    infoview.open()
+    local width = infoview.get_current_infoview().window:width()
+    assert.is.equal(80 / 2, width)
+  end)
+end)