src: add tests

Tests for mergeEnvMaps.

Signed-off-by: Matej Vasek <mvasek@redhat.com>

cmd/root_test.go

@@ -0,0 +1,58 @@
+package cmd
+
+import (
+	"reflect"
+	"testing"
+)
+
+func Test_mergeEnvMaps(t *testing.T) {
+	type args struct {
+		dest map[string]string
+		src  map[string]string
+	}
+	tests := []struct {
+		name string
+		args args
+		want map[string]string
+	}{
+		{
+			"add new var",
+			args{
+				map[string]string{"A": "1"},
+				map[string]string{"B": "2"},
+			},
+			map[string]string{"A": "1", "B": "2"},
+		},
+		{
+			"update var",
+			args{
+				map[string]string{"A": "1"},
+				map[string]string{"A": "2"},
+			},
+			map[string]string{"A": "2"},
+		},
+		{
+			"remove var",
+			args{
+				map[string]string{"A": "1"},
+				map[string]string{"A-": ""},
+			},
+			map[string]string{"A-": ""},
+		},
+		{
+			"re-add var",
+			args{
+				map[string]string{"A-": ""},
+				map[string]string{"A": "1"},
+			},
+			map[string]string{"A": "1"},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := mergeEnvMaps(tt.args.dest, tt.args.src); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("mergeEnvMaps() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}