cache test

internal/app/imagedup/hash/cache_test.go

@@ -0,0 +1,42 @@
+package hash
+
+import (
+	"os"
+	"testing"
+
+	"github.com/kmulvey/path"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCache(t *testing.T) {
+	t.Parallel()
+
+	var cacheFile = "testcache.json"
+
+	var cache, err = NewCache(cacheFile, "TestCache")
+	assert.NoError(t, err)
+
+	files, err := path.ListFiles("../testimages")
+	assert.NoError(t, err)
+	var fileNames = path.OnlyNames(path.OnlyFiles(files))
+
+	for _, file := range fileNames {
+		_, err = cache.GetHash(file)
+		assert.NoError(t, err)
+	}
+	assert.Equal(t, 3, cache.NumImages())
+
+	_, err = cache.GetHash(fileNames[0])
+	assert.NoError(t, err)
+
+	err = cache.Persist()
+	assert.NoError(t, err)
+
+	// do it again
+	cache, err = NewCache(cacheFile, "TestCache2")
+	assert.NoError(t, err)
+	assert.Equal(t, 3, cache.NumImages())
+
+	err = os.RemoveAll(cacheFile)
+	assert.NoError(t, err)
+}