Added tests for last_revision_commit_of_file

Library/Homebrew/test/utils/git_spec.rb

@@ -0,0 +1,47 @@
+require "utils/git"
+
+describe Git do
+  before(:all) do
+    git = HOMEBREW_SHIMS_PATH/"scm/git"
+    file = "lib/blah.rb"
+    repo = Pathname.new("repo")
+    FileUtils.mkpath("repo/lib")
+    `#{git} init`
+    FileUtils.touch("repo/#{file}")
+    File.open(repo.to_s+"/"+file, "w") { |f| f.write("blah") }
+    `#{git} add repo/#{file}`
+    `#{git} commit -m"File added"`
+    @hash1 = `git rev-parse HEAD`
+    File.open(repo.to_s+"/"+file, "w") { |f| f.write("brew") }
+    `#{git} add repo/#{file}`
+    `#{git} commit -m"written to File"`
+    @hash2 = `git rev-parse HEAD`
+  end
+
+  let(:file) { "lib/blah.rb" }
+  let(:repo) { Pathname.new("repo") }
+
+  # after(:all) do
+  #   FileUtils.rm_rf("repo")
+  # end
+
+  describe "#last_revision_commit_of_file" do
+    it "sets args as --skip=1 when before_commit is nil" do
+      expect(described_class.last_revision_commit_of_file(repo, file)).to eq(@hash1[0..6])
+    end
+
+    it "sets args as --skip=1 when before_commit is nil" do
+      expect(described_class.last_revision_commit_of_file(repo, file, before_commit: "0..3")).to eq(@hash2[0..6])
+    end
+  end
+
+  describe "#last_revision_of_file" do
+    it "returns last revision of file" do
+      expect(described_class.last_revision_of_file(repo, repo.to_s+"/"+file)).to eq("blah")
+    end
+
+    it "returns last revision of file based on before_commit" do
+      expect(described_class.last_revision_of_file(repo, repo.to_s+"/"+file, before_commit: "0..3")).to eq("brew")
+    end
+  end
+end

Library/Homebrew/utils/git.rb

@@ -4,7 +4,7 @@ module Git
   module_function
 
   def last_revision_commit_of_file(repo, file, before_commit: nil)
-    args = [before_commit.nil? ? "--skip=1" : before_commit.split("..").first]
+    args = ["--skip=#{before_commit.nil? ? 1 : before_commit.split("..").first}"]
 
     out, = Open3.capture3(
       HOMEBREW_SHIMS_PATH/"scm/git", "-C", repo,
@@ -16,11 +16,10 @@ module Git
   def last_revision_of_file(repo, file, before_commit: nil)
     relative_file = Pathname(file).relative_path_from(repo)
 
-    commit_hash = last_revision_commit_of_file(repo, file, before_commit: before_commit)
-
+    commit_hash = last_revision_commit_of_file(repo, relative_file, before_commit: before_commit)
     out, = Open3.capture3(
       HOMEBREW_SHIMS_PATH/"scm/git", "-C", repo,
-      "show", "#{commit_hash}:#{relative_file}"
+      "show", "#{commit_hash}:#{file}"
     )
     out
   end
@@ -28,8 +27,7 @@ end
 
 module Utils
   def self.git_available?
-    return @git if instance_variable_defined?(:@git)
-    @git = quiet_system HOMEBREW_SHIMS_PATH/"scm/git", "--version"
+    @git ||= quiet_system HOMEBREW_SHIMS_PATH/"scm/git", "--version"
   end
 
   def self.git_path