A lot of changes. Main ones are:

- fraction type renamed as FractionType and moved from operator-fraction.go to fraction-type.go
- ListType moved from operator-list.go to list-type.go
- all test file were renamed adding the "t_" prefix
- defined a test template in file t_temple_test.go
- new test file t_relational_test.go where relational tests are collected
- lists can now compared as set using operators <, <=, >, and >= (IMPORTANT: here = menas same content, not same list)

t_ast_test.go

@@ -0,0 +1,53 @@
+// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
+// All rights reserved.
+
+// t_ast_test.go
+package expr
+
+import (
+	"errors"
+	"testing"
+)
+
+func TestAstString(t *testing.T) {
+	tree := NewAst()
+	if gotResult := tree.String(); gotResult != "(nil)" {
+		t.Errorf(`result: got %q, want "(nil)"`, gotResult)
+	}
+}
+
+func TestAddTokensGood(t *testing.T) {
+	tk1 := NewValueToken(0, 0, SymInteger, "100", 100)
+	tk2 := NewToken(0, 0, SymPlus, "+")
+	tk3 := NewValueToken(0, 0, SymInteger, "50", 500)
+
+	tree := NewAst()
+	if gotErr := tree.addTokens(tk1, tk2, tk3); gotErr != nil {
+		t.Errorf("err: got <%v>, want <nil>", gotErr)
+	}
+}
+
+func TestAddTokensBad(t *testing.T) {
+	tk0 := NewValueToken(0, 0, SymInteger, "200", 200)
+	tk1 := NewValueToken(0, 0, SymInteger, "100", 100)
+	tk2 := NewToken(0, 0, SymPlus, "+")
+	tk3 := NewValueToken(0, 0, SymInteger, "50", 500)
+
+	wantErr := errors.New(`[0:0] two adjacent operators: "200" and "100"`)
+
+	tree := NewAst()
+	if gotErr := tree.addTokens(tk0, tk1, tk2, tk3); gotErr != nil && gotErr.Error() != wantErr.Error() {
+		t.Errorf("err: got <%v>, want <nil>", gotErr)
+	}
+}
+
+func TestAddUnknownTokens(t *testing.T) {
+	tk0 := NewToken(0, 0, SymPercent, "%")
+
+	wantErr := errors.New(`unexpected token "%"`)
+
+	tree := NewAst()
+	if gotErr := tree.addToken(tk0); gotErr != nil && gotErr.Error() != wantErr.Error() {
+		t.Errorf("err: got <%v>, want <%v>", gotErr, wantErr)
+	}
+}