Added tests for ensure_git_installed when git is available or homebrew/core is unavailable

2 files changed, 60 insertions, 99 deletions

diff --git a/Library/Homebrew/test/utils/git_spec.rb b/Library/Homebrew/test/utils/git_spec.rb
index 931699c1b..994e23725 100644
--- a/Library/Homebrew/test/utils/git_spec.rb
+++ b/Library/Homebrew/test/utils/git_spec.rb
@@ -3,45 +3,44 @@ require "utils/git"
 describe Git do
   before(:all) do
     git = HOMEBREW_SHIMS_PATH/"scm/git"
-    file = "lib/blah.rb"
-    repo = Pathname.new("repo")
 
-    (repo/"lib").mkpath
+    @file = "lib/blah.rb"
+    @repo = Pathname.new("repo")
+
+    (@repo/"lib").mkpath
     system git, "init"
-    FileUtils.touch("repo/#{file}")
+    FileUtils.touch(@repo/@file)
 
-    File.open(repo/file, "w") { |f| f.write("blah") }
-    system git, "add", repo/file
+    File.open(@repo/@file, "w") { |f| f.write("blah") }
+    system git, "add", @repo/@file
     system git, "commit", "-m", "'File added'"
     @h1 = `git rev-parse HEAD`
 
-    File.open(repo/file, "w") { |f| f.write("brew") }
-    system git, "add", repo/file
+    File.open(@repo/@file, "w") { |f| f.write("brew") }
+    system git, "add", @repo/@file
     system git, "commit", "-m", "'written to File'"
     @h2 = `git rev-parse HEAD`
   end
 
-  let(:file) { "lib/blah.rb" }
-  let(:repo) { Pathname.new("repo") }
   let(:hash1) { @h1[0..6] }
   let(:hash2) { @h2[0..6] }
 
   after(:all) do
-    FileUtils.rm_rf("repo")
+    FileUtils.rm_rf(@repo)
   end
 
   describe "#last_revision_commit_of_file" do
     it "gives last revision commit when before_commit is nil" do
       expect(
-        described_class.last_revision_commit_of_file(repo, file),
+        described_class.last_revision_commit_of_file(@repo, @file),
       ).to eq(hash1)
     end
 
     it "gives revision commit based on before_commit when it is not nil" do
       expect(
-        described_class.last_revision_commit_of_file(repo,
-                                                    file,
-                                                    before_commit: "0..3"),
+        described_class.last_revision_commit_of_file(@repo,
+                                                    @file,
+                                                    before_commit: hash2),
       ).to eq(hash2)
     end
   end
@@ -49,14 +48,14 @@ describe Git do
   describe "#last_revision_of_file" do
     it "returns last revision of file" do
       expect(
-        described_class.last_revision_of_file(repo,
-                                              repo/file),
+        described_class.last_revision_of_file(@repo,
+                                              @repo/@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/file,
+        described_class.last_revision_of_file(@repo, @repo/@file,
                                               before_commit: "0..3"),
       ).to eq("brew")
     end
@@ -72,100 +71,71 @@ describe Utils do
 
   describe "::git_available?" do
     it "returns true if git --version command succeeds" do
-      allow_any_instance_of(Process::Status).to receive(:success?).and_return(true)
       expect(described_class.git_available?).to be_truthy
     end
 
     it "returns false if git --version command does not succeed" do
-      allow_any_instance_of(Process::Status).to receive(:success?).and_return(false)
+      stub_const("HOMEBREW_SHIMS_PATH", mktmpdir/"shim")
       expect(described_class.git_available?).to be_falsey
     end
-
-    it "returns git version if already set" do
-      described_class.instance_variable_set(:@git, true)
-      expect(described_class.git_available?).to be_truthy
-      described_class.instance_variable_set(:@git, nil)
-    end
   end
 
   describe "::git_path" do
-    context "when git is not available" do
-      before do
-        described_class.instance_variable_set(:@git, false)
-      end
-
-      it "returns nil" do
-        expect(described_class.git_path).to eq(nil)
-      end
+    it "returns nil when git is not available" do
+      stub_const("HOMEBREW_SHIMS_PATH", mktmpdir/"shim")
+      expect(described_class.git_path).to eq(nil)
     end
 
-    context "when git is available" do
-      before do
-        described_class.instance_variable_set(:@git, true)
-      end
-
-      it "returns path of git" do
-        expect(described_class.git_path).to end_with("git")
-      end
-
-      it "returns git_path if already set" do
-        described_class.instance_variable_set(:@git_path, "git")
-        expect(described_class.git_path).to eq("git")
-        described_class.instance_variable_set(:@git_path, nil)
-      end
+    it "returns path of git when git is available" do
+      expect(described_class.git_path).to end_with("git")
     end
   end
 
   describe "::git_version" do
-    context "when git is not available" do
-      before do
-        described_class.instance_variable_set(:@git, false)
-      end
+    it "returns nil when git is not available" do
+      stub_const("HOMEBREW_SHIMS_PATH", mktmpdir/"shim")
+      expect(described_class.git_path).to eq(nil)
+    end
 
-      it "returns nil" do
-        expect(described_class.git_path).to eq(nil)
-      end
+    it "returns version of git when git is available" do
+      expect(described_class.git_version).not_to be_nil
     end
+  end
 
-    context "when git is available" do
+  describe "::ensure_git_installed!" do
+    it "returns nil if git already available" do
+      expect(described_class.ensure_git_installed!).to be_nil
+    end
+
+    context "when git is not already available" do
       before do
-        described_class.instance_variable_set(:@git, true)
+        stub_const("HOMEBREW_SHIMS_PATH", mktmpdir/"shim")
       end
 
-      it "returns version of git" do
-        expect(described_class.git_version).not_to be_nil
+      it "can't install brewed git if homebrew/core is unavailable" do
+        allow_any_instance_of(Pathname).to receive(:directory?).and_return(false)
+        expect { described_class.ensure_git_installed! }.to raise_error("Git is unavailable")
       end
 
-      it "returns git_version if already set" do
-        described_class.instance_variable_set(:@git_version, "v1")
-        expect(described_class.git_version).to eq("v1")
-        described_class.instance_variable_set(:@git_version, nil)
+      it "raises error if can't install git" do
+        stub_const("HOMEBREW_BREW_FILE", mktmpdir/"brew")
+        expect { described_class.ensure_git_installed! }.to raise_error("Git is unavailable")
+      end
+
+      it "installs git" do
+        allow(Homebrew).to receive(:_system).with(any_args).and_return(true)
+        described_class.ensure_git_installed!
       end
     end
   end
 
   describe "::git_remote_exists" do
-    context "when git is not available" do
-      before do
-        described_class.instance_variable_set(:@git, false)
-      end
-
-      it "returns true" do
-        expect(described_class.git_remote_exists("blah")).to be_truthy
-      end
+    it "returns true when git is not available" do
+      stub_const("HOMEBREW_SHIMS_PATH", mktmpdir/"shim")
+      expect(described_class.git_remote_exists("blah")).to be_truthy
     end
 
     context "when git is available" do
-      before(:all) do
-        described_class.instance_variable_set(:@git, true)
-      end
-
-      after(:all) do
-        if described_class.instance_variable_defined?(:@git)
-          described_class.send(:remove_instance_variable, :@git)
-        end
-      end
-
       it "returns true when git remote exists", :needs_network do
         git = HOMEBREW_SHIMS_PATH/"scm/git"
         repo = Pathname.new("hey")
@@ -173,10 +143,10 @@ describe Utils do
 
         system "cd", repo
         system git, "init"
-        system git, "remote", "add", "origin", "git@github.com:Homebrew/brew"
+        system git, "remote", "add", "origin", "http://github.com/Homebrew/homebrew.github.io"
         system "cd .."
 
-        expect(described_class.git_remote_exists("git@github.com:Homebrew/brew")).to be_truthy
+        expect(described_class.git_remote_exists("http://github.com/Homebrew/homebrew.github.io")).to be_truthy
 
         FileUtils.rm_rf(repo)
       end
@@ -191,24 +161,15 @@ describe Utils do
     it "removes @git_path and @git_version if defined" do
       described_class.clear_git_available_cache
 
-      expect(@git_path).to be_nil
-      expect(@git_version).to be_nil
+      expect(described_class.instance_variable_get(:@git_path)).to be_nil
+      expect(described_class.instance_variable_get(:@git_version)).to be_nil
     end
 
     it "removes @git if defined" do
-      described_class.instance_variable_set(:@git, true)
-
-      begin
-        described_class.clear_git_available_cache
-
-        expect(@git).to be_nil
-        expect(@git_path).to be_nil
-        expect(@git_version).to be_nil
-      ensure
-        if described_class.instance_variable_defined?(:@git)
-          described_class.send(:remove_instance_variable, :@git)
-        end
-      end
+      described_class.git_available?
+      described_class.clear_git_available_cache
+
+      expect(described_class.instance_variable_get(:@git)).to be_nil
     end
   end
 end
diff --git a/Library/Homebrew/utils/git.rb b/Library/Homebrew/utils/git.rb
index 1e2e360e6..852192945 100644
--- a/Library/Homebrew/utils/git.rb
+++ b/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 = ["--skip=#{before_commit.nil? ? 1 : before_commit.split("..").first}"]
+    args = [before_commit.nil? ? "--skip=1" : before_commit.split("..").first]
 
     out, = Open3.capture3(
       HOMEBREW_SHIMS_PATH/"scm/git", "-C", repo,