added basic test for term scorer

search/scorer_term_test.go

@@ -0,0 +1,83 @@
+//  Copyright (c) 2013 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 search
+
+import (
+	"math"
+	"reflect"
+	"testing"
+
+	"github.com/couchbaselabs/bleve/index"
+)
+
+func TestTermScorer(t *testing.T) {
+
+	query := TermQuery{
+		Term:     "beer",
+		Field:    "desc",
+		BoostVal: 1.0,
+		Explain:  true,
+	}
+
+	var docTotal uint64 = 100
+	var docTerm uint64 = 9
+	scorer := NewTermQueryScorer(&query, docTotal, docTerm, false)
+	idf := 1.0 + math.Log(float64(docTotal)/float64(docTerm+1.0))
+
+	tests := []struct {
+		termMatch *index.TermFieldDoc
+		result    *DocumentMatch
+	}{
+		// test some simple math
+		{
+			termMatch: &index.TermFieldDoc{
+				ID:   "one",
+				Freq: 1,
+				Norm: 1.0,
+			},
+			result: &DocumentMatch{
+				ID:    "one",
+				Score: math.Sqrt(1.0) * idf,
+			},
+		},
+		// test the same thing again (score should be cached this time)
+		{
+			termMatch: &index.TermFieldDoc{
+				ID:   "one",
+				Freq: 1,
+				Norm: 1.0,
+			},
+			result: &DocumentMatch{
+				ID:    "one",
+				Score: math.Sqrt(1.0) * idf,
+			},
+		},
+		// test a case where the sqrt isn't precalculated
+		{
+			termMatch: &index.TermFieldDoc{
+				ID:   "one",
+				Freq: 65,
+				Norm: 1.0,
+			},
+			result: &DocumentMatch{
+				ID:    "one",
+				Score: math.Sqrt(65) * idf,
+			},
+		},
+	}
+
+	for _, test := range tests {
+		actual := scorer.Score(test.termMatch)
+
+		if !reflect.DeepEqual(actual, test.result) {
+			t.Errorf("expected %#v got %#v for %#v", test.result, actual, test.termMatch)
+		}
+	}
+
+}