Extract Kamal::Git as gateway for all git usage

test/configuration_test.rb

@@ -84,7 +84,7 @@ class ConfigurationTest < ActiveSupport::TestCase
     ENV.delete("VERSION")
 
     @config.expects(:`).with("git rev-parse HEAD").returns("git-version")
-    Kamal::Utils.expects(:uncommitted_changes).returns("")
+    Kamal::Git.expects(:uncommitted_changes).returns("")
     assert_equal "git-version", @config.version
   end
 
@@ -92,7 +92,7 @@ class ConfigurationTest < ActiveSupport::TestCase
     ENV.delete("VERSION")
 
     @config.expects(:`).with("git rev-parse HEAD").returns("git-version")
-    Kamal::Utils.expects(:uncommitted_changes).returns("M   file\n")
+    Kamal::Git.expects(:uncommitted_changes).returns("M   file\n")
     assert_match /^git-version_uncommitted_[0-9a-f]{16}$/, @config.version
   end
 

test/git_test.rb

@@ -0,0 +1,13 @@
+require "test_helper"
+
+class GitTest < ActiveSupport::TestCase
+  test "uncommitted changes exist" do
+    Kamal::Git.expects(:`).with("git status --porcelain").returns("M   file\n")
+    assert_equal "M   file", Kamal::Git.uncommitted_changes
+  end
+
+  test "uncommitted changes do not exist" do
+    Kamal::Git.expects(:`).with("git status --porcelain").returns("")
+    assert_equal "", Kamal::Git.uncommitted_changes
+  end
+end

test/utils_test.rb

@@ -141,14 +141,4 @@ class UtilsTest < ActiveSupport::TestCase
     assert_equal "\"https://example.com/\\$2\"",
       Kamal::Utils.escape_shell_value("https://example.com/$2")
   end
-
-  test "uncommitted changes exist" do
-    Kamal::Utils.expects(:`).with("git status --porcelain").returns("M   file\n")
-    assert_equal "M   file", Kamal::Utils.uncommitted_changes
-  end
-
-  test "uncommitted changes do not exist" do
-    Kamal::Utils.expects(:`).with("git status --porcelain").returns("")
-    assert_equal "", Kamal::Utils.uncommitted_changes
-  end
 end