Adding upstream version 2.5.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

numeric/prefix_coded_test.go

@@ -0,0 +1,158 @@
+//  Copyright (c) 2014 Couchbase, 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 numeric
+
+import (
+	"reflect"
+	"testing"
+)
+
+var tests = []struct {
+	input  int64
+	shift  uint
+	output PrefixCoded
+}{
+	{
+		input:  1,
+		shift:  0,
+		output: PrefixCoded{0x20, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1},
+	},
+	{
+		input:  -1,
+		shift:  0,
+		output: PrefixCoded{0x20, 0x0, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f},
+	},
+	{
+		input:  -94582,
+		shift:  0,
+		output: PrefixCoded{0x20, 0x0, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7a, 0x1d, 0xa},
+	},
+	{
+		input:  314729851,
+		shift:  0,
+		output: PrefixCoded{0x20, 0x1, 0x0, 0x0, 0x0, 0x0, 0x1, 0x16, 0x9, 0x4a, 0x7b},
+	},
+	{
+		input:  314729851,
+		shift:  4,
+		output: PrefixCoded{0x24, 0x8, 0x0, 0x0, 0x0, 0x0, 0x9, 0x30, 0x4c, 0x57},
+	},
+	{
+		input:  314729851,
+		shift:  8,
+		output: PrefixCoded{0x28, 0x40, 0x0, 0x0, 0x0, 0x0, 0x4b, 0x4, 0x65},
+	},
+	{
+		input:  314729851,
+		shift:  16,
+		output: PrefixCoded{0x30, 0x20, 0x0, 0x0, 0x0, 0x0, 0x25, 0x42},
+	},
+	{
+		input:  314729851,
+		shift:  32,
+		output: PrefixCoded{0x40, 0x8, 0x0, 0x0, 0x0, 0x0},
+	},
+	{
+		input:  1234729851,
+		shift:  32,
+		output: PrefixCoded{0x40, 0x8, 0x0, 0x0, 0x0, 0x0},
+	},
+}
+
+// these array encoding values have been verified manually
+// against the lucene implementation
+func TestPrefixCoded(t *testing.T) {
+
+	for _, test := range tests {
+		actual, err := NewPrefixCodedInt64(test.input, test.shift)
+		if err != nil {
+			t.Error(err)
+		}
+		if !reflect.DeepEqual(actual, test.output) {
+			t.Errorf("expected %#v, got %#v", test.output, actual)
+		}
+		checkedShift, err := actual.Shift()
+		if err != nil {
+			t.Error(err)
+		}
+		if checkedShift != test.shift {
+			t.Errorf("expected %d, got %d", test.shift, checkedShift)
+		}
+		// if the shift was 0, make sure we can go back to the original
+		if test.shift == 0 {
+			backToLong, err := actual.Int64()
+			if err != nil {
+				t.Error(err)
+			}
+			if backToLong != test.input {
+				t.Errorf("expected %v, got %v", test.input, backToLong)
+			}
+		}
+	}
+}
+
+func TestPrefixCodedValid(t *testing.T) {
+	// all of the shared tests should be valid
+	for _, test := range tests {
+		valid, _ := ValidPrefixCodedTerm(string(test.output))
+		if !valid {
+			t.Errorf("expected %s to be valid prefix coded, is not", string(test.output))
+		}
+	}
+
+	invalidTests := []struct {
+		data PrefixCoded
+	}{
+		// first byte invalid skip (too low)
+		{
+			data: PrefixCoded{0x19, 'c', 'a', 't'},
+		},
+		// first byte invalid skip (too high)
+		{
+			data: PrefixCoded{0x20 + 64, 'c'},
+		},
+		// length of trailing bytes wrong (too long)
+		{
+			data: PrefixCoded{0x20, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1},
+		},
+		// length of trailing bytes wrong (too short)
+		{
+			data: PrefixCoded{0x20 + 63},
+		},
+	}
+
+	// all of the shared tests should be valid
+	for _, test := range invalidTests {
+		valid, _ := ValidPrefixCodedTerm(string(test.data))
+		if valid {
+			t.Errorf("expected %s to be invalid prefix coded, it is", string(test.data))
+		}
+	}
+}
+
+func BenchmarkTestPrefixCoded(b *testing.B) {
+
+	for i := 0; i < b.N; i++ {
+		for _, test := range tests {
+			actual, err := NewPrefixCodedInt64(test.input, test.shift)
+			if err != nil {
+				b.Error(err)
+			}
+			if !reflect.DeepEqual(actual, test.output) {
+				b.Errorf("expected %#v, got %#v", test.output, actual)
+			}
+		}
+	}
+}