Add a whole lot more tests for the parser (#11)

WoofWare.Expect.Test/SyntaxCases/UnicodeCharacters.fs

@@ -0,0 +1,47 @@
+namespace BigExample
+
+open WoofWare.Expect
+
+module MyModule =
+    let emoji () =
+        expect {
+            snapshot @"Hello 👋 World 🌍 with emoji 🎉🎊"
+            return 123
+        }
+
+    let chineseCharacters () =
+        expect {
+            snapshot """Chinese: 你好世界"""
+            return "hello"
+        }
+
+    let arabicRTL () =
+        expect {
+            snapshot @"Arabic RTL: مرحبا بالعالم"
+            return "rtl test"
+        }
+
+    let combiningCharacters () =
+        expect {
+            // Combining diacritics: e + ́ = é
+            snapshot "test with combining: e\u0301 and a\u0308"
+            return "combining"
+        }
+
+    let mixedScripts () =
+        expect {
+            snapshotJson @"Mixed: English, русский, 日本語, العربية, emoji 🚀"
+            return [ "multilingual" ]
+        }
+
+    let zeroWidthChars () =
+        expect {
+            snapshot @"Zero​width​space​test" // Contains U+200B
+            return "zwsp"
+        }
+
+    let mathSymbols () =
+        expect {
+            snapshot """Math: ∀x∈ℝ, ∃y: x² + y² = 1 ⟹ |x| ≤ 1"""
+            return "math"
+        }