feat(tests): add FlexVer test vector to the Version tests

Signed-off-by: flow <flowlnlnln@gmail.com>

tests/testdata/Version/test_vectors.txt

@@ -0,0 +1,63 @@
+# Test vector from:
+# https://github.com/unascribed/FlexVer/blob/704e12759b6e59220ff888f8bf2ec15b8f8fd969/test/test_vectors.txt
+#
+# This test file is formatted as "<lefthand> <operator> <righthand>", seperated by the space character
+# Implementations should ignore lines starting with "#" and lines that have a length of 0
+
+# Basic numeric ordering (lexical string sort fails these)
+10 > 2
+100 > 10
+
+# Trivial common numerics
+1.0 < 1.1
+1.0 < 1.0.1
+1.1 > 1.0.1
+
+# SemVer compatibility
+1.5 > 1.5-pre1
+1.5 = 1.5+foobar
+
+# SemVer incompatibility
+1.5 < 1.5-2
+1.5-pre10 > 1.5-pre2
+
+# Empty strings
+ = 
+1 > 
+ < 1
+
+# Check boundary between textual and prerelease
+a-a < a
+
+# Check boundary between textual and appendix
+a+a = a
+
+# Dash is included in prerelease comparison (if stripped it will be a smaller component)
+# Note that a-a < a=a regardless since the prerelease splits the component creating a smaller first component; 0 is added to force splitting regardless
+a0-a < a0=a
+
+# Pre-releases must contain only non-digit
+1.16.5-10 > 1.16.5
+
+# Pre-releases can have multiple dashes (should not be split)
+# Reasoning for test data: "p-a!" > "p-a-" (correct); "p-a!" < "p-a t-" (what happens if every dash creates a new component)
+-a- > -a!
+
+# Misc
+b1.7.3 > a1.2.6
+b1.2.6 > a1.7.3
+a1.1.2 < a1.1.2_01
+1.16.5-0.00.5 > 1.14.2-1.3.7
+1.0.0 < 1.0.0_01
+1.0.1 > 1.0.0_01
+1.0.0_01 < 1.0.1
+0.17.1-beta.1 < 0.17.1
+0.17.1-beta.1 < 0.17.1-beta.2
+1.4.5_01 = 1.4.5_01+fabric-1.17
+1.4.5_01 = 1.4.5_01+fabric-1.17+ohgod
+14w16a < 18w40b
+18w40a < 18w40b
+1.4.5_01+fabric-1.17 < 18w40b
+13w02a < c0.3.0_01
+0.6.0-1.18.x < 0.9.beta-1.18.x
+