diff --git a/.luacheckrc b/.luacheckrc
index 0da515bcb..e73f559bf 100644
--- a/.luacheckrc
+++ b/.luacheckrc
@@ -108,8 +108,6 @@ exclude_files = {
 files["spec/unit/*"].std = "+busted"
 files["spec/unit/*"].globals = {
     "package",
-    "assertAlmostEquals",
-    "assertNotAlmostEquals",
     "requireBackgroundRunner",
     "stopBackgroundRunner",
 }
diff --git a/Makefile b/Makefile
index 63ec44511..9db57678d 100644
--- a/Makefile
+++ b/Makefile
@@ -413,7 +413,7 @@ po:
 
 static-check:
 	@if which luacheck > /dev/null; then \
-			luacheck -q {reader,setupkoenv,datastorage}.lua frontend plugins; \
+			luacheck -q {reader,setupkoenv,datastorage}.lua frontend plugins spec; \
 		else \
 			echo "[!] luacheck not found. "\
 			"you can install it with 'luarocks install luacheck'"; \
diff --git a/spec/unit/commonrequire.lua b/spec/unit/commonrequire.lua
index bdac7dff4..6b21e8dad 100644
--- a/spec/unit/commonrequire.lua
+++ b/spec/unit/commonrequire.lua
@@ -24,32 +24,6 @@ Screen:init()
 local Input = require("device").input
 Input.dummy = true
 
-function assertAlmostEquals(expected, actual, margin)
-    if type(actual) ~= 'number' or type(expected) ~= 'number'
-        or type(margin) ~= 'number' then
-        error('assertAlmostEquals: must supply only number arguments.', 2)
-    end
-
-    assert(math.abs(expected - actual) <= margin,
-        'Values are not almost equal\n'
-            .. 'Expected: ' .. expected .. ' with margin of ' .. margin
-            .. ', received: ' .. actual
-    )
-end
-
-function assertNotAlmostEquals(expected, actual, margin)
-    if type(actual) ~= 'number' or type(expected) ~= 'number'
-        or type(margin) ~= 'number' then
-        error('assertAlmostEquals: must supply only number arguments.', 2)
-    end
-
-    assert(math.abs(expected - actual) > margin,
-        'Values are almost equal\n'
-            .. 'Expected: ' .. expected .. ' with margin of ' .. margin
-            .. ', received: ' .. actual
-    )
-end
-
 package.unload = function(module)
     if type(module) ~= "string" then return false end
     package.loaded[module] = nil
diff --git a/spec/unit/koptinterface_spec.lua b/spec/unit/koptinterface_spec.lua
index 1406e3971..43d3f83c7 100644
--- a/spec/unit/koptinterface_spec.lua
+++ b/spec/unit/koptinterface_spec.lua
@@ -30,10 +30,10 @@ describe("Koptinterface module", function()
 
     it("should get auto bbox", function()
         local auto_bbox = Koptinterface:getAutoBBox(doc, 1)
-        assertAlmostEquals(22, auto_bbox.x0, 0.5)
-        assertAlmostEquals(38, auto_bbox.y0, 0.5)
-        assertAlmostEquals(548, auto_bbox.x1, 0.5)
-        assertAlmostEquals(1387, auto_bbox.y1, 0.5)
+        assert.is.near(22, auto_bbox.x0, 0.5)
+        assert.is.near(38, auto_bbox.y0, 0.5)
+        assert.is.near(548, auto_bbox.x1, 0.5)
+        assert.is.near(1387, auto_bbox.y1, 0.5)
     end)
 
     it("should get semi auto bbox", function()
@@ -47,10 +47,10 @@ describe("Koptinterface module", function()
         }
 
         local bbox = Koptinterface:getSemiAutoBBox(doc, 1)
-        assertNotAlmostEquals(semiauto_bbox.x0, bbox.x0, 0.5)
-        assertNotAlmostEquals(semiauto_bbox.y0, bbox.y0, 0.5)
-        assertNotAlmostEquals(semiauto_bbox.x1, bbox.x1, 0.5)
-        assertNotAlmostEquals(semiauto_bbox.y1, bbox.y1, 0.5)
+        assert.is_not.near(semiauto_bbox.x0, bbox.x0, 0.5)
+        assert.is_not.near(semiauto_bbox.y0, bbox.y0, 0.5)
+        assert.is_not.near(semiauto_bbox.x1, bbox.x1, 0.5)
+        assert.is_not.near(semiauto_bbox.y1, bbox.y1, 0.5)
     end)
 
     it("should render optimized page to de-watermark", function()
diff --git a/spec/unit/readerview_spec.lua b/spec/unit/readerview_spec.lua
index 8dae1345a..37f9ce1ab 100644
--- a/spec/unit/readerview_spec.lua
+++ b/spec/unit/readerview_spec.lua
@@ -81,7 +81,7 @@ describe("Readerview module", function()
             },
         }
         assert.are.same(saved_ctx, ctx)
-        assertAlmostEquals(zoom, 0.95011876484561, 0.0001)
+        assert.is.near(0.95011876484561, zoom, 0.0001)
 
         assert.is.same(view.state.page, 1)
         assert.is.same(view.visible_area.x, 0)
@@ -128,7 +128,7 @@ describe("Readerview module", function()
         }
 
         assert.are.same(saved_ctx, ctx)
-        assertAlmostEquals(zoom, 0.95011876484561, 0.0001)
+        assert.is.near(0.95011876484561, zoom, 0.0001)
 
         assert.is.same(view.state.page, 1)
         assert.is.same(view.visible_area.x, 0)