Add tests for recent cgo handling updates.

This commit adds tests for the recent cgo handling of char, unsigned char,
and uint8_t arrays.

In addition, it adds an architecture for the cgo specific testing based on
build constraints.  This was done because spew itself does not require
cgo, but in order to test its handling of the cgo types it needs to be fed
cgo data.  Rather than force all users to have a system which supports cgo
and an external compiler just to run the tests, the cgo test support must
explicitly be turned on via a build tag.

1 files changed, 82 insertions, 0 deletions

diff --git a/spew/dumpcgo_test.go b/spew/dumpcgo_test.go
new file mode 100644
index 0000000..30e7f7c
--- /dev/null
+++ b/spew/dumpcgo_test.go
@@ -0,0 +1,82 @@
+// Copyright (c) 2013 Dave Collins <[email protected]>
+//
+// Permission to use, copy, modify, and distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+// NOTE: Due to the following build constraints, this file will only be compiled
+// when both cgo is supported and "-tags testcgo" is added to the go test
+// command line.  This means the cgo tests are only added (and hence run) when
+// specifially requested.  This configuration is used because spew itself
+// does not require cgo to run even though it does handle certain cgo types
+// specially.  Rather than forcing all clients to require cgo and an external
+// C compiler just to run the tests, this scheme makes them optional.
+// +build cgo,testcgo
+
+package spew_test
+
+import (
+	"fmt"
+	"github.com/davecgh/go-spew/spew/testdata"
+)
+
+func addCgoDumpTests() {
+	// C char pointer.
+	v := testdata.GetCgoCharPointer()
+	nv := testdata.GetCgoNullCharPointer()
+	pv := &v
+	vcAddr := fmt.Sprintf("%p", v)
+	vAddr := fmt.Sprintf("%p", pv)
+	pvAddr := fmt.Sprintf("%p", &pv)
+	vt := "*testdata._Ctype_char"
+	vs := "116"
+	addDumpTest(v, "("+vt+")("+vcAddr+")("+vs+")\n")
+	addDumpTest(pv, "(*"+vt+")("+vAddr+"->"+vcAddr+")("+vs+")\n")
+	addDumpTest(&pv, "(**"+vt+")("+pvAddr+"->"+vAddr+"->"+vcAddr+")("+vs+")\n")
+	addDumpTest(nv, "("+vt+")(<nil>)\n")
+
+	// C char array.
+	v2 := testdata.GetCgoCharArray()
+	v2t := "[6]testdata._Ctype_char"
+	v2s := "{\n 00000000  74 65 73 74 32 00                               " +
+		"  |test2.|\n}"
+	addDumpTest(v2, "("+v2t+") "+v2s+"\n")
+
+	// C unsigned char array.
+	v3 := testdata.GetCgoUnsignedCharArray()
+	v3t := "[6]testdata._Ctype_unsignedchar"
+	v3s := "{\n 00000000  74 65 73 74 33 00                               " +
+		"  |test3.|\n}"
+	addDumpTest(v3, "("+v3t+") "+v3s+"\n")
+
+	// C signed char array.
+	v4 := testdata.GetCgoSignedCharArray()
+	v4t := "[6]testdata._Ctype_schar"
+	v4t2 := "testdata._Ctype_schar"
+	v4s := "{\n (" + v4t2 + ") 116,\n (" + v4t2 + ") 101,\n (" + v4t2 +
+		") 115,\n (" + v4t2 + ") 116,\n (" + v4t2 + ") 52,\n (" + v4t2 +
+		") 0\n}"
+	addDumpTest(v4, "("+v4t+") "+v4s+"\n")
+
+	// C uint8_t array.
+	v5 := testdata.GetCgoUint8tArray()
+	v5t := "[6]testdata._Ctype_uint8_t"
+	v5s := "{\n 00000000  74 65 73 74 35 00                               " +
+		"  |test5.|\n}"
+	addDumpTest(v5, "("+v5t+") "+v5s+"\n")
+
+	// C typedefed unsigned char array.
+	v6 := testdata.GetCgoTypdefedUnsignedCharArray()
+	v6t := "[6]testdata._Ctype_custom_uchar_t"
+	v6s := "{\n 00000000  74 65 73 74 36 00                               " +
+		"  |test6.|\n}"
+	addDumpTest(v6, "("+v6t+") "+v6s+"\n")
+}