diff --git a/app/pubspec.lock b/app/pubspec.lock
index 14e1d4d..f320741 100644
--- a/app/pubspec.lock
+++ b/app/pubspec.lock
@@ -177,6 +177,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.1.1"
+  coverage:
+    dependency: transitive
+    description:
+      name: coverage
+      sha256: "8acabb8306b57a409bf4c83522065672ee13179297a6bb0cb9ead73948df7c76"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.7.2"
   cross_file:
     dependency: transitive
     description:
@@ -490,10 +498,10 @@ packages:
     dependency: transitive
     description:
       name: js
-      sha256: c1b2e9b5ea78c45e1a0788d29606ba27dc5f71f019f32ca5140f61ef071838cf
+      sha256: f2c445dce49627136094980615a031419f7f3eb393237e4ecd97ac15dea343f3
       url: "https://pub.dev"
     source: hosted
-    version: "0.7.1"
+    version: "0.6.7"
   json_annotation:
     dependency: transitive
     description:
@@ -590,6 +598,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.0"
+  node_preamble:
+    dependency: transitive
+    description:
+      name: node_preamble
+      sha256: "6e7eac89047ab8a8d26cf16127b5ed26de65209847630400f9aefd7cd5c730db"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.2"
   package_config:
     dependency: transitive
     description:
@@ -830,6 +846,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.4.1"
+  shelf_packages_handler:
+    dependency: transitive
+    description:
+      name: shelf_packages_handler
+      sha256: "89f967eca29607c933ba9571d838be31d67f53f6e4ee15147d5dc2934fee1b1e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.2"
+  shelf_static:
+    dependency: transitive
+    description:
+      name: shelf_static
+      sha256: a41d3f53c4adf0f57480578c1d61d90342cd617de7fc8077b1304643c2d85c1e
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.2"
   shelf_web_socket:
     dependency: transitive
     description:
@@ -859,6 +891,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.3.4"
+  source_map_stack_trace:
+    dependency: transitive
+    description:
+      name: source_map_stack_trace
+      sha256: "84cf769ad83aa6bb61e0aa5a18e53aea683395f196a6f39c4c881fb90ed4f7ae"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.1"
+  source_maps:
+    dependency: transitive
+    description:
+      name: source_maps
+      sha256: "708b3f6b97248e5781f493b765c3337db11c5d2c81c3094f10904bfa8004c703"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.10.12"
   source_span:
     dependency: transitive
     description:
@@ -915,6 +963,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.2.1"
+  test:
+    dependency: "direct dev"
+    description:
+      name: test
+      sha256: a1f7595805820fcc05e5c52e3a231aedd0b72972cb333e8c738a8b1239448b6f
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.24.9"
   test_api:
     dependency: transitive
     description:
@@ -923,6 +979,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.6.1"
+  test_core:
+    dependency: transitive
+    description:
+      name: test_core
+      sha256: a757b14fc47507060a162cc2530d9a4a2f92f5100a952c7443b5cad5ef5b106a
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.5.9"
   timing:
     dependency: transitive
     description:
@@ -1083,6 +1147,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.4.3"
+  webkit_inspection_protocol:
+    dependency: transitive
+    description:
+      name: webkit_inspection_protocol
+      sha256: "87d3f2333bb240704cd3f1c6b5b7acd8a10e7f0bc28c28dcf14e782014f4a572"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.1"
   win32:
     dependency: transitive
     description:
diff --git a/app/pubspec.yaml b/app/pubspec.yaml
index c58f4cd..c2b852c 100644
--- a/app/pubspec.yaml
+++ b/app/pubspec.yaml
@@ -60,6 +60,7 @@ dev_dependencies:
   flutter_lints: ^3.0.1
   hive_generator: ^2.0.1
   translations_cleaner: ^0.0.5
+  test: ^1.24.9
 
 
 # define app icons
diff --git a/app/test/core_interpolation_test.dart b/app/test/core_interpolation_test.dart
new file mode 100644
index 0000000..7057f0d
--- /dev/null
+++ b/app/test/core_interpolation_test.dart
@@ -0,0 +1,14 @@
+import 'package:trale/core/interpolation.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('Test interpolation, increment, decrement', () {
+    test('ensure interpolation strength is 1', () {
+      expect(InterpolStrength.none.strengthInterpol, 1);
+    });
+
+    test('ensure measurement strength is 2', () {
+      expect(InterpolStrength.none.strengthMeasurement , 2);
+    });
+  });
+}
\ No newline at end of file