1 files changed, 55 insertions, 0 deletions
diff --git a/v2/frequencies_test.go b/v2/frequencies_test.go
new file mode 100644
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--- /dev/null
+++ b/v2/frequencies_test.go
@@ -0,0 +1,55 @@
+// Copyright 2020 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 classifier
+
+import "testing"
+
+func TestTokenSimilarity(t *testing.T) {
+	tests := []struct {
+		name string
+		a, b string
+		sim  float64
+	}{
+		{
+			name: "identical match",
+			a:    "this text is the same in both scenarios",
+			b:    "this text is the same in both scenarios",
+			sim:  1.0,
+		},
+		{
+			name: "no match",
+			a:    "this text is the same in both scenarios",
+			b:    "completely different stuff here",
+			sim:  0.0,
+		},
+		{
+			name: "half match",
+			a:    "this text is one sample sentence",
+			b:    "that text is some different sample",
+			sim:  0.5,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			c := NewClassifier(.8) // This value doesn't affect the test.
+			c.AddContent("", "b", "", []byte(test.b))
+			a := c.createTargetIndexedDocument([]byte(test.a))
+			if actual := a.tokenSimilarity(c.getIndexedDocument("", "b", "")); actual != test.sim {
+				t.Errorf("got %v want %v", actual, test.sim)
+			}
+		})
+	}
+}