Ensure env variables are forwarded to the editor command

lib/tty/editor.rb

@@ -143,9 +143,12 @@ def initialize(command: nil, raise_on_failure: false, show_menu: true,
 
     # Read or update environment vars
     #
+    # @return [Hash]
+    #
     # @api public
     def env(value = (not_set = true))
       return @env if not_set
+
       @env = value
     end
 

spec/unit/env_spec.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+RSpec.describe TTY::Editor, "#env" do
+  it "configures ENV variables via initializer" do
+    allow(described_class).to receive(:available).and_return(["vim"])
+    editor = described_class.new(env: {"FOO" => "bar"})
+
+    expect(editor.env).to eq({"FOO" => "bar"})
+  end
+
+  it "configures ENV variables via accessor" do
+    allow(described_class).to receive(:available).and_return(["vim"])
+    editor = described_class.new
+
+    editor.env "FOO" => "bar"
+
+    expect(editor.env).to eq({"FOO" => "bar"})
+  end
+
+  it "forwards env variables to command" do
+    allow(described_class).to receive(:available).and_return(["vim"])
+    file = fixtures_path("content.txt")
+    editor = described_class.new(env: {"FOO" => "bar"})
+    allow(editor).to receive(:system).and_return(true)
+
+    editor.open(file)
+
+    expect(editor).to have_received(:system).with({"FOO" => "bar"}, "vim", file)
+  end
+end