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PiperOrigin-RevId: 194583126
Change-Id: Ica1d8821a90f74e7e745962d71801c598c652463

1 files changed, 145 insertions, 0 deletions

diff --git a/pkg/p9/version_test.go b/pkg/p9/version_test.go
new file mode 100644
index 000000000..634ac3ca5
--- /dev/null
+++ b/pkg/p9/version_test.go
@@ -0,0 +1,145 @@
+// Copyright 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package p9
+
+import (
+	"testing"
+)
+
+func TestVersionNumberEquivalent(t *testing.T) {
+	for i := uint32(0); i < 1024; i++ {
+		str := versionString(i)
+		version, ok := parseVersion(str)
+		if !ok {
+			t.Errorf("#%d: parseVersion(%q) failed, want success", i, str)
+			continue
+		}
+		if i != version {
+			t.Errorf("#%d: got version %d, want %d", i, i, version)
+		}
+	}
+}
+
+func TestVersionStringEquivalent(t *testing.T) {
+	// There is one case where the version is not equivalent on purpose,
+	// that is 9P2000.L.Google.0.  It is not equivalent because versionString
+	// must always return the more generic 9P2000.L for legacy servers that
+	// check for it.  See net/9p/client.c.
+	str := "9P2000.L.Google.0"
+	version, ok := parseVersion(str)
+	if !ok {
+		t.Errorf("parseVersion(%q) failed, want success", str)
+	}
+	if got := versionString(version); got != "9P2000.L" {
+		t.Errorf("versionString(%d) got %q, want %q", version, got, "9P2000.L")
+	}
+
+	for _, test := range []struct {
+		versionString string
+	}{
+		{
+			versionString: "9P2000.L",
+		},
+		{
+			versionString: "9P2000.L.Google.1",
+		},
+		{
+			versionString: "9P2000.L.Google.347823894",
+		},
+	} {
+		version, ok := parseVersion(test.versionString)
+		if !ok {
+			t.Errorf("parseVersion(%q) failed, want success", test.versionString)
+			continue
+		}
+		if got := versionString(version); got != test.versionString {
+			t.Errorf("versionString(%d) got %q, want %q", version, got, test.versionString)
+		}
+	}
+}
+
+func TestParseVersion(t *testing.T) {
+	for _, test := range []struct {
+		versionString   string
+		expectSuccess   bool
+		expectedVersion uint32
+	}{
+		{
+			versionString: "9P",
+			expectSuccess: false,
+		},
+		{
+			versionString: "9P.L",
+			expectSuccess: false,
+		},
+		{
+			versionString: "9P200.L",
+			expectSuccess: false,
+		},
+		{
+			versionString: "9P2000",
+			expectSuccess: false,
+		},
+		{
+			versionString: "9P2000.L.Google.-1",
+			expectSuccess: false,
+		},
+		{
+			versionString: "9P2000.L.Google.",
+			expectSuccess: false,
+		},
+		{
+			versionString: "9P2000.L.Google.3546343826724305832",
+			expectSuccess: false,
+		},
+		{
+			versionString: "9P2001.L",
+			expectSuccess: false,
+		},
+		{
+			versionString:   "9P2000.L",
+			expectSuccess:   true,
+			expectedVersion: 0,
+		},
+		{
+			versionString:   "9P2000.L.Google.0",
+			expectSuccess:   true,
+			expectedVersion: 0,
+		},
+		{
+			versionString:   "9P2000.L.Google.1",
+			expectSuccess:   true,
+			expectedVersion: 1,
+		},
+	} {
+		version, ok := parseVersion(test.versionString)
+		if ok != test.expectSuccess {
+			t.Errorf("parseVersion(%q) got (_, %v), want (_, %v)", test.versionString, ok, test.expectSuccess)
+			continue
+		}
+		if !test.expectSuccess {
+			continue
+		}
+		if version != test.expectedVersion {
+			t.Errorf("parseVersion(%q) got (%d, _), want (%d, _)", test.versionString, version, test.expectedVersion)
+		}
+	}
+}
+
+func BenchmarkParseVersion(b *testing.B) {
+	for n := 0; n < b.N; n++ {
+		parseVersion("9P2000.L.Google.1")
+	}
+}