feat: add unit tests for lexer scanner functionality

Signed-off-by: Akash <[email protected]>

lexer/lexer_test.go

@@ -0,0 +1,41 @@
+package lexer
+
+import (
+	"testing"
+)
+
+func TestNewScanner(t *testing.T) {
+	src := "fn main() {}"
+	scanner := NewScanner(src)
+	if scanner.source != src {
+		t.Errorf("Expected source %q, got %q", src, scanner.source)
+	}
+	if scanner.line != 1 {
+		t.Errorf("Expected line to be 1, got %d", scanner.line)
+	}
+}
+
+func TestScanTokens_EmptySource(t *testing.T) {
+	scanner := NewScanner("")
+	tokens, errs := scanner.ScanTokens()
+	if len(tokens) != 1 {
+		t.Errorf("Expected 1 token (EOF), got %d", len(tokens))
+	}
+	if len(errs) != 0 {
+		t.Errorf("Expected no errors, got %d", len(errs))
+	}
+	if tokens[0].Type != EOF {
+		t.Errorf("Expected EOF token, got %v", tokens[0].Type)
+	}
+}
+
+func TestScanTokens_ValidSource(t *testing.T) {
+	scanner := NewScanner("fn main() {}")
+	tokens, errs := scanner.ScanTokens()
+	if len(errs) != 0 {
+		t.Errorf("Expected no errors, got %d", len(errs))
+	}
+	if len(tokens) == 0 {
+		t.Error("Expected some tokens, got none")
+	}
+}

transpiler/transpiler.go

@@ -5,7 +5,6 @@ import (
 	"GoCrab/lexer"
 	"GoCrab/parser"
 	"fmt"
-
 )
 
 var hasError bool