Move integration tests to integration/, expose missing public methods in the core

utils/utils.go

@@ -1207,3 +1207,43 @@ func PartParser(template, data string) (map[string]string, error) {
 	}
 	return out, nil
 }
+
+
+
+var globalTestID string
+
+// TestDirectory creates a new temporary directory and returns its path.
+// The contents of directory at path `templateDir` is copied into the
+// new directory.
+func TestDirectory(templateDir string) (dir string, err error) {
+	if globalTestID == "" {
+		globalTestID = RandomString()[:4]
+	}
+	prefix := fmt.Sprintf("docker-test%s-%s-", globalTestID, GetCallerName(2))
+	if prefix == "" {
+		prefix = "docker-test-"
+	}
+	dir, err = ioutil.TempDir("", prefix)
+	if err = os.Remove(dir); err != nil {
+		return
+	}
+	if templateDir != "" {
+		if err = CopyDirectory(templateDir, dir); err != nil {
+			return
+		}
+	}
+	return
+}
+
+// GetCallerName introspects the call stack and returns the name of the
+// function `depth` levels down in the stack.
+func GetCallerName(depth int) string {
+	// Use the caller function name as a prefix.
+	// This helps trace temp directories back to their test.
+	pc, _, _, _ := runtime.Caller(depth + 1)
+	callerLongName := runtime.FuncForPC(pc).Name()
+	parts := strings.Split(callerLongName, ".")
+	callerShortName := parts[len(parts)-1]
+	return callerShortName
+}
+