diff --git a/.idea/fif.iml b/.idea/fif.iml
index b22d9da..9c6974e 100644
--- a/.idea/fif.iml
+++ b/.idea/fif.iml
@@ -1,13 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <module type="CPP_MODULE" version="4">
-  <component name="FacetManager">
-    <facet type="Python" name="Python facet">
-      <configuration sdkName="Python 3.9" />
-    </facet>
-  </component>
   <component name="NewModuleRootManager">
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test" isTestSource="true" />
       <excludeFolder url="file://$MODULE_DIR$/target" />
       <excludeFolder url="file://$MODULE_DIR$/imgs" />
       <excludeFolder url="file://$MODULE_DIR$/old" />
diff --git a/.idea/runConfigurations/Coverage.xml b/.idea/runConfigurations/Coverage.xml
new file mode 100644
index 0000000..ee43215
--- /dev/null
+++ b/.idea/runConfigurations/Coverage.xml
@@ -0,0 +1,19 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Coverage" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="command" value="test" />
+    <option name="workingDirectory" value="file://$PROJECT_DIR$" />
+    <option name="channel" value="NIGHTLY" />
+    <option name="requiredFeatures" value="true" />
+    <option name="allFeatures" value="false" />
+    <option name="emulateTerminal" value="false" />
+    <option name="backtrace" value="SHORT" />
+    <envs>
+      <env name="RUST_LOG" value="debug" />
+    </envs>
+    <option name="isRedirectInput" value="false" />
+    <option name="redirectInputPath" value="" />
+    <method v="2">
+      <option name="CARGO.BUILD_TASK_PROVIDER" enabled="true" />
+    </method>
+  </configuration>
+</component>
\ No newline at end of file
diff --git a/.idea/runConfigurations/Run.xml b/.idea/runConfigurations/Run.xml
new file mode 100644
index 0000000..f367ac8
--- /dev/null
+++ b/.idea/runConfigurations/Run.xml
@@ -0,0 +1,19 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Run" type="CargoCommandRunConfiguration" factoryName="Cargo Command" nameIsGenerated="true">
+    <option name="command" value="run -- imgs" />
+    <option name="workingDirectory" value="file://$PROJECT_DIR$" />
+    <option name="channel" value="DEFAULT" />
+    <option name="requiredFeatures" value="true" />
+    <option name="allFeatures" value="false" />
+    <option name="emulateTerminal" value="false" />
+    <option name="backtrace" value="SHORT" />
+    <envs>
+      <env name="RUST_LOG" value="debug" />
+    </envs>
+    <option name="isRedirectInput" value="false" />
+    <option name="redirectInputPath" value="" />
+    <method v="2">
+      <option name="CARGO.BUILD_TASK_PROVIDER" enabled="true" />
+    </method>
+  </configuration>
+</component>
\ No newline at end of file
diff --git a/.idea/runConfigurations/Test.xml b/.idea/runConfigurations/Test.xml
new file mode 100644
index 0000000..d9fd454
--- /dev/null
+++ b/.idea/runConfigurations/Test.xml
@@ -0,0 +1,19 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Test" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="command" value="test" />
+    <option name="workingDirectory" value="file://$PROJECT_DIR$" />
+    <option name="channel" value="DEFAULT" />
+    <option name="requiredFeatures" value="true" />
+    <option name="allFeatures" value="false" />
+    <option name="emulateTerminal" value="false" />
+    <option name="backtrace" value="SHORT" />
+    <envs>
+      <env name="RUST_LOG" value="debug" />
+    </envs>
+    <option name="isRedirectInput" value="false" />
+    <option name="redirectInputPath" value="" />
+    <method v="2">
+      <option name="CARGO.BUILD_TASK_PROVIDER" enabled="true" />
+    </method>
+  </configuration>
+</component>
\ No newline at end of file
diff --git a/.idea/runConfigurations/Test__infer_.xml b/.idea/runConfigurations/Test__infer_.xml
new file mode 100644
index 0000000..a05e88f
--- /dev/null
+++ b/.idea/runConfigurations/Test__infer_.xml
@@ -0,0 +1,19 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Test (infer)" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="command" value="test --features=infer-backend" />
+    <option name="workingDirectory" value="file://$PROJECT_DIR$" />
+    <option name="channel" value="DEFAULT" />
+    <option name="requiredFeatures" value="true" />
+    <option name="allFeatures" value="false" />
+    <option name="emulateTerminal" value="false" />
+    <option name="backtrace" value="SHORT" />
+    <envs>
+      <env name="RUST_LOG" value="debug" />
+    </envs>
+    <option name="isRedirectInput" value="false" />
+    <option name="redirectInputPath" value="" />
+    <method v="2">
+      <option name="CARGO.BUILD_TASK_PROVIDER" enabled="true" />
+    </method>
+  </configuration>
+</component>
\ No newline at end of file