slices union and intersection

useful for merging and splitting configs

util/util_test.go

@@ -6,6 +6,90 @@ import (
 	"testing"
 )
 
+func TestNilMap(t *testing.T) {
+	assert := require.New(t)
+	var m map[string]interface{} = nil
+	assert.True(m == nil)
+}
+
+func TestMapCopy(t *testing.T) {
+	assert := require.New(t)
+	m0 := map[interface{}]interface{}{"a": 1, "b": map[interface{}]interface{}{"c": 3}, "d": "4"}
+	m1 := MapCopy(m0)
+	assert.Equal(m0, m1)
+
+	delete(m0, "a")
+	assert.Equal(len(m1), len(m0)+1)
+
+	b0 := m0["b"].(map[interface{}]interface{})
+	b1 := m1["b"].(map[interface{}]interface{})
+	b1["e"] = "queer"
+
+	assert.Equal(len(b1), len(b0)+1)
+}
+
+func TestSliceCopy(t *testing.T) {
+	assert := require.New(t)
+	m0 := []interface{}{1, map[interface{}]interface{}{"c": 3}, "4"}
+	m1 := SliceCopy(m0)
+	assert.Equal(m0, m1)
+
+	m0 = m0[1:]
+	assert.Equal(len(m1), len(m0)+1)
+
+	b0 := m0[0].(map[interface{}]interface{})
+	b1 := m1[1].(map[interface{}]interface{})
+	b1["e"] = "queer"
+
+	assert.Equal(len(b1), len(b0)+1)
+}
+
+func TestMapsIntersection(t *testing.T) {
+	assert := require.New(t)
+
+	m0 := map[interface{}]interface{}{
+		"a": 1,
+		"b": map[interface{}]interface{}{"c": 3},
+		"d": "4",
+		"e": []interface{}{1, 2, 3},
+	}
+	m1 := MapCopy(m0)
+
+	delete(m0, "a")
+	b1 := m1["b"].(map[interface{}]interface{})
+	delete(b1, "c")
+	m1["e"] = []interface{}{2, 3, 4}
+	expected := map[interface{}]interface{}{"b": map[interface{}]interface{}{}, "d": "4", "e": []interface{}{2, 3}}
+	assert.Equal(expected, MapsIntersection(m0, m1, Equal))
+}
+
+func TestMapsUnion(t *testing.T) {
+	assert := require.New(t)
+
+	m0 := map[interface{}]interface{}{
+		"a": 1,
+		"b": map[interface{}]interface{}{"c": 3},
+		"d": "4",
+		"f": []interface{}{1, 2, 3},
+	}
+	m1 := MapCopy(m0)
+	m1["e"] = "added"
+	m1["d"] = "replaced"
+	m1["f"] = []interface{}{2, 3, 4}
+
+	delete(m0, "a")
+	b1 := m1["b"].(map[interface{}]interface{})
+	delete(b1, "c")
+	expected := map[interface{}]interface{}{
+		"a": 1,
+		"b": map[interface{}]interface{}{"c": 3},
+		"d": "replaced",
+		"e": "added",
+		"f": []interface{}{1, 2, 3, 4},
+	}
+	assert.Equal(expected, MapsUnion(m0, m1, Replace))
+}
+
 func TestLoadResourceSimple(t *testing.T) {
 	assert := require.New(t)