Add test case for Import from file

internal/cli/server/chains/chain_test.go

@@ -0,0 +1,36 @@
+package chains
+
+import (
+	"testing"
+)
+
+func TestImportFromFile(t *testing.T) {
+	type args struct {
+		filename string
+	}
+	tests := []struct {
+		name    string
+		args    args
+		wantErr bool
+	}{
+		{
+			name:    "ImportFromFile correct json file",
+			args:    args{filename: "test_files/chain_test.json"},
+			wantErr: false,
+		},
+		{
+			name:    "ImportFromFile nonexistent json file",
+			args:    args{filename: "test_files/chain_test_nonexistent.json"},
+			wantErr: true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := ImportFromFile(tt.args.filename)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("ImportFromFile() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+		})
+	}
+}