tests: Add missing version tests

Closes Homebrew/homebrew#49031.

Signed-off-by: Baptiste Fontaine <batifon@yahoo.fr>

Library/Homebrew/test/test_versions.rb

@@ -12,6 +12,32 @@ class VersionTests < Homebrew::TestCase
     assert_raises(TypeError) { Version.new(1) }
     assert_raises(TypeError) { Version.new(:symbol) }
   end
+
+  def test_detected_from_url?
+    refute Version.new("1.0").detected_from_url?
+    assert Version::FromURL.new("1.0").detected_from_url?
+  end
+end
+
+class VersionTokenTests < Homebrew::TestCase
+  def test_inspect
+    assert_equal '#<Version::Token "foo">',
+      Version::Token.new("foo").inspect
+  end
+
+  def test_to_s
+    assert_equal "foo", Version::Token.new("foo").to_s
+  end
+end
+
+class VersionNullTokenTests < Homebrew::TestCase
+  def test_inspect
+    assert_equal "#<Version::NullToken>", Version::NullToken.new.inspect
+  end
+
+  def test_comparing_null
+    assert_operator Version::NullToken.new, :==, Version::NullToken.new
+  end
 end
 
 class VersionComparisonTests < Homebrew::TestCase
@@ -404,4 +430,9 @@ class VersionParsingTests < Homebrew::TestCase
   def test_dash_separated_version
     assert_version_detected "6-20151227", "ftp://gcc.gnu.org/pub/gcc/snapshots/6-20151227/gcc-6-20151227.tar.bz2"
   end
+
+  def test_from_url
+    assert_version_detected "1.2.3",
+      "http://github.com/foo/bar.git", {:tag => "v1.2.3"}
+  end
 end

Library/Homebrew/test/testing_env.rb

@@ -30,8 +30,8 @@ module Homebrew
       assert_equal Version.new(expected), actual
     end
 
-    def assert_version_detected(expected, url)
-      assert_equal expected, Version.parse(url).to_s
+    def assert_version_detected(expected, url, specs={})
+      assert_equal expected, Version.detect(url, specs).to_s
     end
 
     def assert_version_nil(url)