test: exhaustively test comparison of versions

This tests all possible combinations of alpha, beta, RC, regular, and
patch versions. Also improves code coverage and partitions the version
comparison tests into more uniform chunks.

Closes Homebrew/homebrew#47669.

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

Library/Homebrew/test/test_versions.rb

@@ -15,17 +15,16 @@ class VersionTests < Homebrew::TestCase
 end
 
 class VersionComparisonTests < Homebrew::TestCase
-  def test_version_comparisons
+  def test_comparing_regular_versions
     assert_operator version("0.1"), :==, version("0.1.0")
     assert_operator version("0.1"), :<, version("0.2")
     assert_operator version("1.2.3"), :>, version("1.2.2")
     assert_operator version("1.2.4"), :<, version("1.2.4.1")
-  end
 
-  def test_patchlevel
-    assert_operator version("1.2.3-p34"), :>, version("1.2.3-p33")
-    assert_operator version("1.2.3-p33"), :<, version("1.2.3-p34")
-    assert_operator version("1.2.3-p10"), :>, version("1.2.3-p9")
+    assert_operator version("1.2.3"), :>, version("1.2.3alpha4")
+    assert_operator version("1.2.3"), :>, version("1.2.3beta2")
+    assert_operator version("1.2.3"), :>, version("1.2.3rc3")
+    assert_operator version("1.2.3"), :<, version("1.2.3-p34")
   end
 
   def test_HEAD
@@ -33,14 +32,54 @@ class VersionComparisonTests < Homebrew::TestCase
     assert_operator version("1.2.3"), :<, version("HEAD")
   end
 
-  def test_alpha_beta_rc
-    assert_operator version("3.2.0b4"), :<, version("3.2.0")
-    assert_operator version("1.0beta6"), :<, version("1.0b7")
-    assert_operator version("1.0b6"), :<, version("1.0beta7")
-    assert_operator version("1.1alpha4"), :<, version("1.1beta2")
-    assert_operator version("1.1beta2"), :<, version("1.1rc1")
-    assert_operator version("1.0.0beta7"), :<, version("1.0.0")
-    assert_operator version("3.2.1"), :>, version("3.2beta4")
+  def test_comparing_alpha_versions
+    assert_operator version("1.2.3alpha4"), :==, version("1.2.3a4")
+    assert_operator version("1.2.3alpha4"), :==, version("1.2.3A4")
+    assert_operator version("1.2.3alpha4"), :>, version("1.2.3alpha3")
+    assert_operator version("1.2.3alpha4"), :<, version("1.2.3alpha5")
+    assert_operator version("1.2.3alpha4"), :<, version("1.2.3alpha10")
+
+    assert_operator version("1.2.3alpha4"), :<, version("1.2.3beta2")
+    assert_operator version("1.2.3alpha4"), :<, version("1.2.3rc3")
+    assert_operator version("1.2.3alpha4"), :<, version("1.2.3")
+    assert_operator version("1.2.3alpha4"), :<, version("1.2.3-p34")
+  end
+
+  def test_comparing_beta_versions
+    assert_operator version("1.2.3beta2"), :==, version("1.2.3b2")
+    assert_operator version("1.2.3beta2"), :==, version("1.2.3B2")
+    assert_operator version("1.2.3beta2"), :>, version("1.2.3beta1")
+    assert_operator version("1.2.3beta2"), :<, version("1.2.3beta3")
+    assert_operator version("1.2.3beta2"), :<, version("1.2.3beta10")
+
+    assert_operator version("1.2.3beta2"), :>, version("1.2.3alpha4")
+    assert_operator version("1.2.3beta2"), :<, version("1.2.3rc3")
+    assert_operator version("1.2.3beta2"), :<, version("1.2.3")
+    assert_operator version("1.2.3beta2"), :<, version("1.2.3-p34")
+  end
+
+  def test_comparing_rc_versions
+    assert_operator version("1.2.3rc3"), :==, version("1.2.3RC3")
+    assert_operator version("1.2.3rc3"), :>, version("1.2.3rc2")
+    assert_operator version("1.2.3rc3"), :<, version("1.2.3rc4")
+    assert_operator version("1.2.3rc3"), :<, version("1.2.3rc10")
+
+    assert_operator version("1.2.3rc3"), :>, version("1.2.3alpha4")
+    assert_operator version("1.2.3rc3"), :>, version("1.2.3beta2")
+    assert_operator version("1.2.3rc3"), :<, version("1.2.3")
+    assert_operator version("1.2.3rc3"), :<, version("1.2.3-p34")
+  end
+
+  def test_comparing_patchlevel_versions
+    assert_operator version("1.2.3-p34"), :==, version("1.2.3-P34")
+    assert_operator version("1.2.3-p34"), :>, version("1.2.3-p33")
+    assert_operator version("1.2.3-p34"), :<, version("1.2.3-p35")
+    assert_operator version("1.2.3-p34"), :>, version("1.2.3-p9")
+
+    assert_operator version("1.2.3-p34"), :>, version("1.2.3alpha4")
+    assert_operator version("1.2.3-p34"), :>, version("1.2.3beta2")
+    assert_operator version("1.2.3-p34"), :>, version("1.2.3rc3")
+    assert_operator version("1.2.3-p34"), :>, version("1.2.3")
   end
 
   def test_comparing_unevenly_padded_versions
@@ -57,10 +96,6 @@ class VersionComparisonTests < Homebrew::TestCase
     assert_raises(ArgumentError) { v > Object.new }
   end
 
-  def test_compare_patchlevel_to_non_patchlevel
-    assert_operator version("9.9.3-P1"), :>, version("9.9.3")
-  end
-
   def test_erlang_version
     versions = %w[R16B R15B03-1 R15B03 R15B02 R15B01 R14B04 R14B03
                   R14B02 R14B01 R14B R13B04 R13B03 R13B02-1].reverse