tests: wrote up more tests for brew install

Library/Homebrew/test/cmd/install_spec.rb

@@ -17,6 +17,26 @@ describe "brew install", :integration_test do
     expect(HOMEBREW_CELLAR/"testball1/0.1/foo/test").not_to be_a_file
   end
 
+  it "does not install formulae with forbidden license" do
+    setup_test_formula "package_license"
+
+    expect { brew "install", "package_license", "HOMEBREW_FORBIDDEN_LICENSES" => "0BSD MIT"}
+        .to output("Error: package_license has a forbidden license 0BSD.\n").to_stderr
+                .and not_to_output.to_stdout
+                .and be_a_failure
+    expect(HOMEBREW_CELLAR/"testball1/0.1/foo/test").not_to be_a_file
+  end
+
+  it "installs formulae if formulae license is not forbidden" do
+    setup_test_formula "testball1"
+
+    expect { brew "install", "testball1", "HOMEBREW_FORBIDDEN_LICENSES" => "AAK ADSL AML"}
+        .to output(%r{#{HOMEBREW_CELLAR}/testball1/0\.1}).to_stdout
+                .and not_to_output.to_stderr
+                         .and be_a_success
+    expect(HOMEBREW_CELLAR/"testball1/0.1/foo/test").not_to be_a_file
+  end
+
   it "installs formulae with options" do
     setup_test_formula "testball1"
 

Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb

@@ -161,6 +161,12 @@ RSpec.shared_context "integration test" do
       content = <<~RUBY
         url "https://brew.sh/#{name}-1.0"
       RUBY
+
+    when "package_license"
+      content = <<~RUBY
+        url "https://brew.sh/#patchelf-1.0"
+        license "0BSD"
+      RUBY
     end
 
     Formulary.core_path(name).tap do |formula_path|