Add unit tests for the ios_get_app_version action

Author: iangmaia

spec/ios_get_app_version_spec.rb

@@ -0,0 +1,41 @@
+require 'spec_helper'
+
+describe Fastlane::Actions::IosGetAppVersionAction do
+  describe 'getting the public app version from the provided .xcconfig file' do
+    it 'parses the xcconfig file format correctly and gets the public version' do
+      xcconfig_mock_content = <<~CONTENT
+        // a comment
+        VERSION_SHORT=6
+        VERSION_LONG=6.30.0
+      CONTENT
+
+      allow(File).to receive(:exist?).and_return(true)
+
+      expect_version(xcconfig_mock_content: xcconfig_mock_content, expected_version: '6.30')
+    end
+
+    it 'parses the xcconfig file format correctly and gets the public hotfix version' do
+      xcconfig_mock_content = <<~CONTENT
+        VERSION_SHORT=6
+        // a comment
+        VERSION_LONG=6.30.1
+      CONTENT
+
+      allow(File).to receive(:exist?).and_return(true)
+
+      expect_version(xcconfig_mock_content: xcconfig_mock_content, expected_version: '6.30.1')
+    end
+
+    def expect_version(xcconfig_mock_content:, expected_version:)
+      xcconfig_mock_file_path = File.join('mock', 'file', 'path')
+
+      allow(File).to receive(:open).with(xcconfig_mock_file_path, 'r').and_yield(StringIO.new(xcconfig_mock_content))
+
+      version_result = run_described_fastlane_action(
+        public_version_xcconfig_file: xcconfig_mock_file_path
+      )
+
+      expect(version_result).to eq(expected_version)
+    end
+  end
+end