Add tests for non-happy paths

Author: EasterPeanut

test/ex_css_modules/view_test.exs

@@ -1,78 +1,120 @@
 defmodule ExCSSModules.ViewTest do
   @example_stylesheet __ENV__.file
-                      |> Path.dirname
+                      |> Path.dirname()
                       |> Path.join("../support/stylesheet.css")
 
   use ExUnit.Case
 
-  defmodule ViewModuleTest do
-    use ExCSSModules.View, stylesheet: __ENV__.file
-                                       |> Path.dirname
-                                       |> Path.join("../support/stylesheet.css")
+  defmodule ViewModule.Test do
+    use ExCSSModules.View,
+      stylesheet:
+        __ENV__.file
+        |> Path.dirname()
+        |> Path.join("../support/stylesheet.css")
   end
 
-  defmodule EmbeddedViewModuleTest do
-    use ExCSSModules.View, stylesheet: __ENV__.file
-                                       |> Path.dirname
-                                       |> Path.join("../support/stylesheet.css"),
-                           embed_stylesheet: true
+  defmodule ViewModule.Embedded.Test do
+    use ExCSSModules.View,
+      stylesheet:
+        __ENV__.file
+        |> Path.dirname()
+        |> Path.join("../support/stylesheet.css"),
+      embed_stylesheet: true
+  end
+
+  defmodule ViewModule.StylesheetDefinitions.EmptyObject.Test do
+    use ExCSSModules.View,
+      stylesheet:
+        __ENV__.file
+        |> Path.dirname()
+        |> Path.join("../support/stylesheet_definitions_with_empty_object.css")
+  end
+
+  defmodule ViewModule.StylesheetDefinitions.EmptyFile.Test do
+    use ExCSSModules.View,
+      stylesheet:
+        __ENV__.file
+        |> Path.dirname()
+        |> Path.join("../support/empty_file.css")
+  end
+
+  defmodule ViewModule.StylesheetDefinitions.NoFile.Test do
+    use ExCSSModules.View,
+      stylesheet:
+        __ENV__.file
+        |> Path.dirname()
+        |> Path.join("../support/no_stylesheet_definition.css")
   end
 
   describe "stylesheet_definition/0" do
     test "gets the stylesheet string" do
-      assert ViewModuleTest.stylesheet_definition
-        == Path.expand(@example_stylesheet)
+      assert ViewModule.Test.stylesheet_definition() ==
+               Path.expand(@example_stylesheet)
     end
 
     test "gets the embedded stylesheet" do
-      assert EmbeddedViewModuleTest.stylesheet_definition
-        == ExCSSModules.stylesheet(@example_stylesheet)
+      assert ViewModule.Embedded.Test.stylesheet_definition() ==
+               ExCSSModules.stylesheet(@example_stylesheet)
     end
   end
 
   describe "stylesheet/0" do
     test "calls the stylesheet" do
-      assert ViewModuleTest.stylesheet
-        == ExCSSModules.stylesheet(@example_stylesheet)
+      assert ViewModule.Test.stylesheet() ==
+               ExCSSModules.stylesheet(@example_stylesheet)
+    end
+
+    test "returns an empty map if the stylesheet definitions json file contains just an empty object" do
+      assert ViewModule.StylesheetDefinitions.EmptyObject.Test.stylesheet() == %{}
+    end
+
+    test "returns an empty map if the stylesheet definitions json file is empty" do
+      assert ViewModule.StylesheetDefinitions.EmptyFile.Test.stylesheet() == %{}
+    end
+
+    test "returns an empty map if the stylesheet definitions json file does not exist" do
+      assert ViewModule.StylesheetDefinitions.NoFile.Test.stylesheet() == %{}
     end
   end
 
   describe "class_selector/1" do
     test "prepends the class_name with a dot" do
-      assert ViewModuleTest.class_selector("title") ==
-        ExCSSModules.class_selector(@example_stylesheet, "title")
+      assert ViewModule.Test.class_selector("title") ==
+               ExCSSModules.class_selector(@example_stylesheet, "title")
     end
   end
 
   describe "class_name/1" do
     test "calls the css/2 method on ExCSSModules" do
-      assert ViewModuleTest.class_name("title") ==
-        ExCSSModules.class_name(@example_stylesheet, "title")
+      assert ViewModule.Test.class_name("title") ==
+               ExCSSModules.class_name(@example_stylesheet, "title")
     end
   end
 
   describe "class_name/2" do
     test "calls the css/3 method on ExCSSModules" do
-      assert ViewModuleTest.class_name("title", true) ==
-        ExCSSModules.class_name(@example_stylesheet, "title", true)
-      assert ViewModuleTest.class_name("title", false) ==
-        ExCSSModules.class_name(@example_stylesheet, "title", false)
+      assert ViewModule.Test.class_name("title", true) ==
+               ExCSSModules.class_name(@example_stylesheet, "title", true)
+
+      assert ViewModule.Test.class_name("title", false) ==
+               ExCSSModules.class_name(@example_stylesheet, "title", false)
     end
   end
 
   describe "class/1" do
     test "calls the class/2 method on ExCSSModules" do
-      assert ViewModuleTest.class("title") ==
-        ExCSSModules.class(@example_stylesheet, "title")
+      assert ViewModule.Test.class("title") ==
+               ExCSSModules.class(@example_stylesheet, "title")
     end
   end
 
   describe "class/2" do
     test "calls the class/3 method on ExCSSModules" do
-      assert ViewModuleTest.class("title", true) ==
-        ExCSSModules.class(@example_stylesheet, "title", true)
-      assert ViewModuleTest.class("title", false) ==
-        ExCSSModules.class(@example_stylesheet, "title", false)
+      assert ViewModule.Test.class("title", true) ==
+               ExCSSModules.class(@example_stylesheet, "title", true)
+
+      assert ViewModule.Test.class("title", false) ==
+               ExCSSModules.class(@example_stylesheet, "title", false)
     end
   end
 end

test/support/empty_file.css

@@ -0,0 +1 @@
+{}