tests: extend cmd/install integration test

Closes #626.

Signed-off-by: Martin Afanasjew <martin@afanasjew.de>

Library/Homebrew/test/test_integration_cmds.rb

@@ -265,9 +265,24 @@ class IntegrationCommandTests < Homebrew::TestCase
   end
 
   def test_install
-    setup_test_formula "testball"
+    setup_test_formula "testball1"
+    assert_match "Specify `--HEAD`", cmd_fail("install", "testball1", "--head")
+    assert_match "No head is defined", cmd_fail("install", "testball1", "--HEAD")
+    assert_match "No devel block", cmd_fail("install", "testball1", "--devel")
+    assert_match "#{HOMEBREW_CELLAR}/testball1/0.1", cmd("install", "testball1")
+    assert_match "testball1-0.1 already installed", cmd("install", "testball1")
+    assert_match "MacRuby is not packaged", cmd_fail("install", "macruby")
+    assert_match "No available formula", cmd_fail("install", "formula")
+    assert_match "This similarly named formula was found",
+      cmd_fail("install", "testball")
 
-    assert_match "#{HOMEBREW_CELLAR}/testball/0.1", cmd("install", "testball")
+    setup_test_formula "testball2"
+    assert_match "These similarly named formulae were found",
+      cmd_fail("install", "testball")
+
+    install_and_rename_coretap_formula "testball1", "testball2"
+    assert_match "testball1 already installed, it's just not migrated",
+      cmd("install", "testball2")
   end
 
   def test_bottle