Add tests for ExtractParameter

helpers/helpers_test.go

@@ -0,0 +1,28 @@
+package helpers
+
+import "testing"
+
+var extractParameterTests = []struct {
+	s      string
+	params map[string]interface{}
+	value  string
+	ok     bool
+}{
+	{"a", map[string]interface{}{"a": "z"}, "z", true},
+	{"a.b", map[string]interface{}{"a": map[string]interface{}{"b": "z"}}, "z", true},
+	{"a.b.c", map[string]interface{}{"a": map[string]interface{}{"b": map[string]interface{}{"c": "z"}}}, "z", true},
+	{"a.1.b", map[string]interface{}{"a": []interface{}{map[string]interface{}{"b": "y"}, map[string]interface{}{"b": "z"}}}, "z", true},
+	// failures
+	{"a.X", map[string]interface{}{"a": map[string]interface{}{"b": "z"}}, "", false},
+	{"a.500.b", map[string]interface{}{"a": map[string]interface{}{"b": "z"}}, "", false},
+	{"a.501.b", map[string]interface{}{"a": []interface{}{map[string]interface{}{"b": "y"}, map[string]interface{}{"b": "z"}}}, "", false},
+}
+
+func TestExtractParameter(t *testing.T) {
+	for _, tt := range extractParameterTests {
+		s, ok := ExtractParameter(tt.s, tt.params)
+		if ok != tt.ok || s != tt.value {
+			t.Errorf("failed to extract parameter %q:\nexpected {value:%#v, ok:%#v},\ngot {value:%#v, ok:%#v}", tt.s, tt.value, tt.ok, s, ok)
+		}
+	}
+}