diff --git a/termmapper_test.go b/termmapper_test.go
new file mode 100644
index 0000000..0492c35
--- /dev/null
+++ b/termmapper_test.go
@@ -0,0 +1,106 @@
+package termmapper
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestConstants(t *testing.T) {
+	assert := assert.New(t)
+	assert.Equal(Hui(), "test")
+}
+
+// KoralPipe-TermMapping
+
+func TestTokenBuilder(t *testing.T) {
+
+	assert := assert.New(t)
+
+	var strBuilder strings.Builder
+	term(&strBuilder, "myfoundry", "mylayer", "mykey1", true)
+	assert.Equal(strBuilder.String(), `{"@type":"koral:term","match":"match:eq","foundry":"myfoundry","layer":"mylayer","key":"mykey1"}`)
+	strBuilder.Reset()
+
+	token(&strBuilder, "myfoundry", "mylayer", []string{"mykey1", "mykey2"})
+	assert.Equal(strBuilder.String(), "{\"@type\":\"koral:token\",\"wrap\":{\"@type\":\"koral:termGroup\",\"relation\":\"relation:and\",\"operation\":\"operation:and\",\"operands\":[{\"@type\":\"koral:term\",\"match\":\"match:eq\",\"foundry\":\"myfoundry\",\"layer\":\"mylayer\",\"key\":\"mykey1\"},{\"@type\":\"koral:term\",\"match\":\"match:eq\",\"foundry\":\"myfoundry\",\"layer\":\"mylayer\",\"key\":\"mykey2\"}]}}")
+	strBuilder.Reset()
+
+	token(&strBuilder, "myfoundry", "mylayer", []string{"mykey2"})
+	assert.Equal(strBuilder.String(), "{\"@type\":\"koral:token\",\"wrap\":{\"@type\":\"koral:term\",\"match\":\"match:eq\",\"foundry\":\"myfoundry\",\"layer\":\"mylayer\",\"key\":\"mykey2\"}}")
+	strBuilder.Reset()
+}
+
+/*
+		jsonStr := `{
+		"query": {
+			"@type": "koral:operation",
+			"operators": [
+				{
+					"@type": "koral:term",
+					"key": "example1"
+				},
+				{
+					"@type": "koral:term",
+					"key": "example2"
+				},
+				{
+					"@type": "koral:operation",
+					"operators": [
+						{
+							"@type": "koral:term",
+							"key": "nested"
+						}
+					]
+				}
+			]
+		}
+	}`
+*/
+
+func TestTermReplacement(t *testing.T) {
+
+	assert := assert.New(t)
+
+	// case1: 1 -> 1 the term is wrapped
+	testStr := replaceWrappedTerm("{\"@type\":\"koral:term\",\"match\":\"match:eq\",\"foundry\":\"myfoundry\",\"layer\":\"mylayer\",\"key\":\"mykey\"}", "myfoundry2", "mylayer2", "mykey2")
+	assert.Equal(testStr, "{\"@type\":\"koral:term\",\"match\":\"match:eq\",\"foundry\":\"myfoundry2\",\"layer\":\"mylayer2\",\"key\":\"mykey2\"}")
+
+	// case2: 1 -> 1 the term is an operand in a termGroup with the same relation/operation
+	// case3: 1 -> 1 the term is an operand in a termGroup with a different relation/operation
+	testStr = replaceGroupedTerm(
+		"{\"@type\":\"koral:termGroup\",\"relation\":\"relation:and\",\"operation\":\"operation:and\",\"operands\":[{\"@type\":\"koral:term\",\"match\":\"match:eq\",\"foundry\":\"myfoundry\",\"layer\":\"mylayer\",\"key\":\"mykey\"},{\"@type\":\"koral:term\",\"match\":\"match:eq\",\"foundry\":\"myfoundry\",\"layer\":\"mylayer\",\"key\":\"mykey2\"}]}",
+		[]int{0},
+		"myfoundryX",
+		"mylayerX",
+		"mykeyX",
+	)
+	assert.Equal(testStr, "{\"@type\":\"koral:termGroup\",\"relation\":\"relation:and\",\"operation\":\"operation:and\",\"operands\":[{\"@type\":\"koral:term\",\"match\":\"match:eq\",\"foundry\":\"myfoundryX\",\"layer\":\"mylayerX\",\"key\":\"mykeyX\"},{\"@type\":\"koral:term\",\"match\":\"match:eq\",\"foundry\":\"myfoundry\",\"layer\":\"mylayer\",\"key\":\"mykey2\"}]}")
+
+	testStr = replaceGroupedTerm(
+		"{\"@type\":\"koral:termGroup\",\"relation\":\"relation:and\",\"operation\":\"operation:and\",\"operands\":[{\"@type\":\"koral:term\",\"match\":\"match:ne\",\"foundry\":\"myfoundry\",\"layer\":\"mylayer\",\"key\":\"mykey\"},{\"@type\":\"koral:term\",\"match\":\"match:eq\",\"foundry\":\"myfoundry\",\"layer\":\"mylayer\",\"key\":\"mykey2\"}]}",
+		[]int{0},
+		"myfoundryX",
+		"mylayerX",
+		"mykeyX",
+	)
+	assert.Equal(testStr, "{\"@type\":\"koral:termGroup\",\"relation\":\"relation:and\",\"operation\":\"operation:and\",\"operands\":[{\"@type\":\"koral:term\",\"match\":\"match:ne\",\"foundry\":\"myfoundryX\",\"layer\":\"mylayerX\",\"key\":\"mykeyX\"},{\"@type\":\"koral:term\",\"match\":\"match:eq\",\"foundry\":\"myfoundry\",\"layer\":\"mylayer\",\"key\":\"mykey2\"}]}")
+
+	// case4: n -> 1 the term is an operand in a termGroup with the same relation/operation
+	testStr = replaceGroupedTerm(
+		"{\"@type\":\"koral:termGroup\",\"relation\":\"relation:and\",\"operation\":\"operation:and\",\"operands\":[{\"@type\":\"koral:term\",\"match\":\"match:ne\",\"foundry\":\"myfoundry\",\"layer\":\"mylayer\",\"key\":\"mykey\"},{\"@type\":\"koral:term\",\"match\":\"match:eq\",\"foundry\":\"myfoundry\",\"layer\":\"mylayer\",\"key\":\"mykey2\"}]}",
+		[]int{0, 1},
+		"myfoundryX",
+		"mylayerX",
+		"mykeyX",
+	)
+	assert.Equal(testStr, "{\"@type\":\"koral:termGroup\",\"relation\":\"relation:and\",\"operation\":\"operation:and\",\"operands\":[{\"@type\":\"koral:term\",\"match\":\"match:ne\",\"foundry\":\"myfoundryX\",\"layer\":\"mylayerX\",\"key\":\"mykeyX\"}]}")
+
+	// case5: n -> 1 the term is an operand in a termGroup with a different relation/operation
+	// case6: 1 -> n the term is wrapped
+	// case7: 1 -> n the term is an operand in a termGroup with the same relation/operation
+	// case8: 1 -> n the term is an operand in a termGroup with a different relation/operation
+	// case9: n -> n the term is an operand in a termGroup with the same relation/operation
+	// case10: n -> n the term is an operand in a termGroup with a different relation/operation
+}