Write some tests for the style wrapper

tools/utils/style/wrapper_test.go

@@ -0,0 +1,38 @@
+// License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package style
+
+import (
+	"fmt"
+	"testing"
+)
+
+var _ = fmt.Print
+
+func TestANSIStyleContext(t *testing.T) {
+	var ctx = Context{AllowEscapeCodes: false}
+	sprint := ctx.SprintFunc("bold")
+	if sprint("test") != "test" {
+		t.Fatal("AllowEscapeCodes=false not respected")
+	}
+	ctx.AllowEscapeCodes = true
+	if sprint("test") == "test" {
+		t.Fatal("AllowEscapeCodes=true not respected")
+	}
+}
+
+func TestANSIStyleSprint(t *testing.T) {
+	var ctx = Context{AllowEscapeCodes: true}
+
+	test := func(spec string, prefix string, suffix string) {
+		actual := ctx.SprintFunc(spec)("  ")
+		expected := prefix + "  " + suffix
+		if actual != expected {
+			t.Fatalf("Formatting with spec: %s failed expected != actual: %#v != %#v", spec, expected, actual)
+		}
+	}
+
+	test("bold", "\x1b[1m", "\x1b[22m")
+	test("bold fg=red u=curly", "\x1b[1;4:3;31m", "\x1b[22;4:0;39m")
+
+}