1 files changed, 95 insertions, 0 deletions
diff --git a/usr/gri/pretty/format_test.go b/usr/gri/pretty/format_test.go
new file mode 100644
index 000000000..e2948cc34
--- /dev/null
+++ b/usr/gri/pretty/format_test.go
@@ -0,0 +1,95 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package format
+
+import (
+	"format";
+	"testing";
+)
+
+
+func check(t *testing.T, form, expected string, args ...) {
+	result := format.Parse(form).Sprint(args);
+	if result != expected {
+		t.Errorf(
+			"format  : %s\nresult  : %s\nexpected: %s\n\n",
+			form, result, expected
+		)
+	}
+}
+
+
+// ----------------------------------------------------------------------------
+// - formatting of basic type int
+
+const F0 =
+	`int = "0x%x";`
+
+func Test0(t *testing.T) {
+	check(t, F0, "0x2a", 42);
+}
+
+
+// ----------------------------------------------------------------------------
+// - default formatting of basic type int
+// - formatting of a struct
+
+type T1 struct {
+	a int;
+}
+
+const F1 =
+	`format.T1 = "<" a ">";`
+
+func Test1(t *testing.T) {
+	check(t, F1, "<42>", T1{42});
+}
+
+
+// ----------------------------------------------------------------------------
+// - formatting of a struct with an optional field (pointer)
+// - default formatting for pointers
+
+type T2 struct {
+	s string;
+	p *T1;
+}
+
+const F2a =
+	F1 +
+	`pointer = *;`
+	`format.T2 = s ["-" p "-"];`;
+	
+const F2b =
+	F1 +
+	`format.T2 = s ("-" p "-" | "empty");`;
+	
+func Test2(t *testing.T) {
+	check(t, F2a, "foo", T2{"foo", nil});
+	check(t, F2a, "bar-<17>-", T2{"bar", &T1{17}});
+	check(t, F2b, "fooempty", T2{"foo", nil});
+}
+
+
+// ----------------------------------------------------------------------------
+// - formatting of a struct with a repetitive field (slice)
+
+type T3 struct {
+	s string;
+	a []int;
+}
+
+const F3a =
+	`format.T3 = s  { " " a a "," };`;
+
+const F3b =
+	`format.T3 = [a:""] s | "nothing";`;  // use 'a' to select alternative w/o printing a
+
+func Test3(t *testing.T) {
+	check(t, F3a, "foo", T3{"foo", nil});
+	check(t, F3a, "foo 00, 11, 22,", T3{"foo", []int{0, 1, 2}});
+	//check(t, F3b, "nothing", T3{"bar", nil});  // TODO fix this
+	check(t, F3b, "bar", T3{"bar", []int{0}});
+}