diff --git a/tests/t20008/.clang-uml b/tests/t20008/.clang-uml
new file mode 100644
index 00000000..f266305c
--- /dev/null
+++ b/tests/t20008/.clang-uml
@@ -0,0 +1,14 @@
+compilation_database_dir: ..
+output_directory: puml
+diagrams:
+  t20008_sequence:
+    type: sequence
+    glob:
+      - ../../tests/t20008/t20008.cc
+    include:
+      namespaces:
+        - clanguml::t20008
+    using_namespace:
+      - clanguml::t20008
+    start_from:
+      - function: "clanguml::t20008::tmain()"
\ No newline at end of file
diff --git a/tests/t20008/t20008.cc b/tests/t20008/t20008.cc
new file mode 100644
index 00000000..3305ade0
--- /dev/null
+++ b/tests/t20008/t20008.cc
@@ -0,0 +1,43 @@
+#include <type_traits>
+#include <string>
+
+namespace clanguml {
+namespace t20008
+{
+
+template <typename T> struct A {
+    void a1(T arg) { }
+    void a2(T arg) { }
+    void a3(T arg) { }
+};
+
+template <typename T> struct B {
+    A<T> a;
+
+    void b(T arg) {
+        if constexpr (std::is_integral_v<T>) {
+            a.a1(arg);
+        }
+        else if constexpr(std::is_pointer_v<T>) {
+            a.a2(arg);
+        }
+        else {
+            a.a3(arg);
+        }
+
+    }
+};
+
+void tmain() {
+    using namespace std::string_literals;
+
+    B<int> bint;
+    B<const char*> bcharp;
+    B<std::string> bstring;
+
+    bint.b(1);
+    bcharp.b("1");
+    bstring.b("1"s);
+}
+}
+}
\ No newline at end of file
diff --git a/tests/t20008/test_case.h b/tests/t20008/test_case.h
new file mode 100644
index 00000000..221485e2
--- /dev/null
+++ b/tests/t20008/test_case.h
@@ -0,0 +1,53 @@
+/**
+ * tests/t20008/test_case.h
+ *
+ * Copyright (c) 2021-2022 Bartek Kryza <bkryza@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+TEST_CASE("t20008", "[test-case][sequence]")
+{
+    auto [config, db] = load_config("t20008");
+
+    auto diagram = config.diagrams["t20008_sequence"];
+
+    REQUIRE(diagram->name == "t20008_sequence");
+
+    auto model = generate_sequence_diagram(*db, diagram);
+
+    REQUIRE(model->name() == "t20008_sequence");
+
+    auto puml = generate_sequence_puml(diagram, *model);
+    AliasMatcher _A(puml);
+
+    REQUIRE_THAT(puml, StartsWith("@startuml"));
+    REQUIRE_THAT(puml, EndsWith("@enduml\n"));
+
+    // Check if all calls exist
+    REQUIRE_THAT(puml, HasCall(_A("tmain()"), _A("B<int>"), "b"));
+    REQUIRE_THAT(puml, HasCall(_A("B<int>"), _A("A<int>"), "a1"));
+    REQUIRE_THAT(puml, !HasCall(_A("B<int>"), _A("A<int>"), "a2"));
+    REQUIRE_THAT(puml, !HasCall(_A("B<int>"), _A("A<int>"), "a3"));
+
+    REQUIRE_THAT(puml, HasCall(_A("tmain()"), _A("B<const char *>"), "b"));
+    REQUIRE_THAT(
+        puml, HasCall(_A("B<const char *>"), _A("A<const char *>"), "a2"));
+
+    REQUIRE_THAT(puml, HasCall(_A("tmain()"), _A("B<std::string>"), "b"));
+    REQUIRE_THAT(
+        puml, HasCall(_A("B<std::string>"), _A("A<std::string>"), "a3"));
+
+    save_puml(
+        "./" + config.output_directory() + "/" + diagram->name + ".puml", puml);
+}
\ No newline at end of file
diff --git a/tests/test_cases.cc b/tests/test_cases.cc
index 51a822cf..74e7fe9a 100644
--- a/tests/test_cases.cc
+++ b/tests/test_cases.cc
@@ -254,6 +254,7 @@ using namespace clanguml::test::matchers;
 #include "t20005/test_case.h"
 #include "t20006/test_case.h"
 #include "t20007/test_case.h"
+#include "t20008/test_case.h"
 
 ///
 /// Package diagram tests
diff --git a/tests/test_cases.h b/tests/test_cases.h
index 90302891..caf6a7fa 100644
--- a/tests/test_cases.h
+++ b/tests/test_cases.h
@@ -79,26 +79,19 @@ template <typename T, typename... Ts> constexpr bool has_type() noexcept
     return (std::is_same_v<T, Ts> || ... || false);
 }
 
-struct Public {
-};
+struct Public { };
 
-struct Protected {
-};
+struct Protected { };
 
-struct Private {
-};
+struct Private { };
 
-struct Abstract {
-};
+struct Abstract { };
 
-struct Static {
-};
+struct Static { };
 
-struct Const {
-};
+struct Const { };
 
-struct Default {
-};
+struct Default { };
 
 struct HasCallWithResultMatcher : ContainsMatcher {
     HasCallWithResultMatcher(
@@ -158,6 +151,8 @@ struct AliasMatcher {
 
         util::replace_all(name, "(", "\\(");
         util::replace_all(name, ")", "\\)");
+        util::replace_all(name, " ", "\\s");
+        util::replace_all(name, "*", "\\*");
 
         patterns.push_back(
             std::regex{"class\\s\"" + name + "\"\\sas\\s" + alias_regex});
@@ -180,12 +175,11 @@ struct AliasMatcher {
 
         for (const auto &line : puml) {
             for (const auto &pattern : patterns) {
-                if (std::regex_search(line, base_match, pattern)) {
-                    if (base_match.size() == 2) {
-                        std::ssub_match base_sub_match = base_match[1];
-                        std::string alias = base_sub_match.str();
-                        return trim(alias);
-                    }
+                if (std::regex_search(line, base_match, pattern) &&
+                    base_match.size() == 2) {
+                    std::ssub_match base_sub_match = base_match[1];
+                    std::string alias = base_sub_match.str();
+                    return trim(alias);
                 }
             }
         }
diff --git a/tests/test_cases.yaml b/tests/test_cases.yaml
index 115abd8a..38b74d48 100644
--- a/tests/test_cases.yaml
+++ b/tests/test_cases.yaml
@@ -169,6 +169,9 @@ test_cases:
     - name: t20007
       title: Class template variadic argument list sequence diagram
       description:
+    - name: t20008
+      title: Constexpr if sequence diagram test case
+      description:
   Package diagrams:
     - name: t30001
       title: Basic package diagram test case