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+/*
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+ * Copyright (c) 2013 Dave Collins <dave@davec.name>
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+ *
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+ * Permission to use, copy, modify, and distribute this software for any
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+ * purpose with or without fee is hereby granted, provided that the above
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+ * copyright notice and this permission notice appear in all copies.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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+ */
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+
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+package spew_test
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+
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+import (
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+ "fmt"
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+)
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+
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+// custom type to test Stinger interface on pointer receiver.
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+type pstringer string
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+
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+// String implements the Stringer interface for testing invocation of custom
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+// stringers on types with only pointer receivers.
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+func (s *pstringer) String() string {
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+ return "stringer " + string(*s)
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+}
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+
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+// xref1 and xref2 are cross referencing structs for testing circular reference
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+// detection.
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+type xref1 struct {
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+ ps2 *xref2
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+}
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+type xref2 struct {
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+ ps1 *xref1
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+}
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+
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+// indirCir1, indirCir2, and indirCir3 are used to generate an indirect circular
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+// reference for testing detection.
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+type indirCir1 struct {
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+ ps2 *indirCir2
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+}
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+type indirCir2 struct {
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+ ps3 *indirCir3
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+}
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+type indirCir3 struct {
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+ ps1 *indirCir1
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+}
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+
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+// panicer is used to intentionally cause a panic for testing spew properly
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+// handles them
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+type panicer int
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+
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+func (p panicer) String() string {
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+ panic("test panic")
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+}
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+
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+// stringizeWants converts a slice of wanted test output into a format suitable
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+// for an test error message.
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+func stringizeWants(wants []string) string {
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+ s := ""
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+ for i, want := range wants {
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+ if i > 0 {
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+ s += fmt.Sprintf("want%d: %s", i+1, want)
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+ } else {
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+ s += "want: " + want
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+ }
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+ }
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+ return s
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+}
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+
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+// testFailed returns whether or not a test failed by checking if the result
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+// of the test is in the slice of wanted strings.
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+func testFailed(result string, wants []string) bool {
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+ for _, want := range wants {
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+ if result == want {
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+ return false
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+ }
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+ }
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+ return true
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+}
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