diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6c784734d..cdcc3f4a8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -38,7 +38,7 @@ jobs:
       - uses: actions-rs/clippy-check@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
-          args: --all
+          args: --workspace --tests --examples
 
 
   build_and_test:
diff --git a/src/blob.rs b/src/blob.rs
index 3fc3028c0..4abb13fa7 100644
--- a/src/blob.rs
+++ b/src/blob.rs
@@ -685,7 +685,7 @@ mod tests {
 
         let (stem, ext) = BlobObject::sanitise_name("foo?.bar");
         assert!(stem.contains("foo"));
-        assert!(!stem.contains("?"));
+        assert!(!stem.contains('?'));
         assert_eq!(ext, ".bar");
 
         let (stem, ext) = BlobObject::sanitise_name("no-extension");
@@ -698,10 +698,10 @@ mod tests {
         assert!(!stem.contains("ignored"));
         assert!(stem.contains("this"));
         assert!(stem.contains("forbidden"));
-        assert!(!stem.contains("/"));
-        assert!(!stem.contains("\\"));
-        assert!(!stem.contains(":"));
-        assert!(!stem.contains("*"));
-        assert!(!stem.contains("?"));
+        assert!(!stem.contains('/'));
+        assert!(!stem.contains('\\'));
+        assert!(!stem.contains(':'));
+        assert!(!stem.contains('*'));
+        assert!(!stem.contains('?'));
     }
 }
diff --git a/src/configure/auto_mozilla.rs b/src/configure/auto_mozilla.rs
index d0c18b4b7..f434cc1a1 100644
--- a/src/configure/auto_mozilla.rs
+++ b/src/configure/auto_mozilla.rs
@@ -268,6 +268,8 @@ pub(crate) async fn moz_autoconfigure(
 
 #[cfg(test)]
 mod tests {
+    #![allow(clippy::indexing_slicing)]
+
     use super::*;
 
     #[test]
diff --git a/src/configure/auto_outlook.rs b/src/configure/auto_outlook.rs
index c4a8c6a43..091901e63 100644
--- a/src/configure/auto_outlook.rs
+++ b/src/configure/auto_outlook.rs
@@ -209,6 +209,8 @@ pub(crate) async fn outlk_autodiscover(
 
 #[cfg(test)]
 mod tests {
+    #![allow(clippy::indexing_slicing)]
+
     use super::*;
 
     #[test]
diff --git a/src/configure/mod.rs b/src/configure/mod.rs
index 098e2bfe0..8e303c1fc 100644
--- a/src/configure/mod.rs
+++ b/src/configure/mod.rs
@@ -498,6 +498,7 @@ pub enum Error {
 
 #[cfg(test)]
 mod tests {
+    #![allow(clippy::indexing_slicing)]
 
     use super::*;
     use crate::config::*;
diff --git a/src/context.rs b/src/context.rs
index d7d065bd1..d281a936f 100644
--- a/src/context.rs
+++ b/src/context.rs
@@ -573,7 +573,7 @@ mod tests {
         let tmp = tempfile::tempdir().unwrap();
         let dbfile = tmp.path().join("db.sqlite");
         let blobdir = PathBuf::new();
-        let res = Context::with_blobdir("FakeOS".into(), dbfile.into(), blobdir.into(), 1).await;
+        let res = Context::with_blobdir("FakeOS".into(), dbfile.into(), blobdir, 1).await;
         assert!(res.is_err());
     }
 
diff --git a/src/dc_receive_imf.rs b/src/dc_receive_imf.rs
index bd4d28530..7bf950f17 100644
--- a/src/dc_receive_imf.rs
+++ b/src/dc_receive_imf.rs
@@ -2213,7 +2213,7 @@ mod tests {
         } else {
             panic!("Wrong item type");
         };
-        let msg = message::Message::load_from_db(&t.ctx, msg_id.clone())
+        let msg = message::Message::load_from_db(&t.ctx, *msg_id)
             .await
             .unwrap();
         assert_eq!(msg.is_dc_message, MessengerMessage::Yes);
@@ -2264,7 +2264,7 @@ mod tests {
             chat::get_chat_msgs(&t.ctx, group_id, 0, None).await.len(),
             1
         );
-        let msg = message::Message::load_from_db(&t.ctx, msg_id.clone())
+        let msg = message::Message::load_from_db(&t.ctx, *msg_id)
             .await
             .unwrap();
         assert_eq!(msg.state, MessageState::OutMdnRcvd);
@@ -2352,7 +2352,7 @@ mod tests {
         } else {
             panic!("Wrong item type");
         };
-        let msg = message::Message::load_from_db(&t.ctx, msg_id.clone())
+        let msg = message::Message::load_from_db(&t.ctx, *msg_id)
             .await
             .unwrap();
         assert_eq!(msg.is_dc_message, MessengerMessage::Yes);
diff --git a/src/dc_tools.rs b/src/dc_tools.rs
index a6954c6b6..ad22ac6f8 100644
--- a/src/dc_tools.rs
+++ b/src/dc_tools.rs
@@ -639,6 +639,8 @@ pub(crate) fn improve_single_line_input(input: impl AsRef<str>) -> String {
 
 #[cfg(test)]
 mod tests {
+    #![allow(clippy::indexing_slicing)]
+
     use super::*;
     use std::convert::TryInto;
 
diff --git a/src/key.rs b/src/key.rs
index 35a588339..b9e88f8be 100644
--- a/src/key.rs
+++ b/src/key.rs
@@ -529,11 +529,11 @@ i8pcjGO+IZffvyZJVRWfVooBJmWWbPB1pueo3tx8w3+fcuzpxz+RLFKaPyqXO+dD
     #[test]
     fn test_from_slice_bad_data() {
         let mut bad_data: [u8; 4096] = [0; 4096];
-        for i in 0..4096 {
-            bad_data[i] = (i & 0xff) as u8;
+        for (i, v) in bad_data.iter_mut().enumerate() {
+            *v = (i & 0xff) as u8;
         }
         for j in 0..(4096 / 40) {
-            let slice = &bad_data[j..j + 4096 / 2 + j];
+            let slice = &bad_data.get(j..j + 4096 / 2 + j).unwrap();
             assert!(SignedPublicKey::from_slice(slice).is_err());
             assert!(SignedSecretKey::from_slice(slice).is_err());
         }
@@ -593,7 +593,7 @@ i8pcjGO+IZffvyZJVRWfVooBJmWWbPB1pueo3tx8w3+fcuzpxz+RLFKaPyqXO+dD
         let ctx0 = ctx.clone();
         let thr0 =
             thread::spawn(move || async_std::task::block_on(SignedPublicKey::load_self(&ctx0)));
-        let ctx1 = ctx.clone();
+        let ctx1 = ctx;
         let thr1 =
             thread::spawn(move || async_std::task::block_on(SignedPublicKey::load_self(&ctx1)));
         let res0 = thr0.join().unwrap();
diff --git a/src/location.rs b/src/location.rs
index aba674b30..7bafb2bf2 100644
--- a/src/location.rs
+++ b/src/location.rs
@@ -723,6 +723,8 @@ pub(crate) async fn job_maybe_send_locations_ended(
 
 #[cfg(test)]
 mod tests {
+    #![allow(clippy::indexing_slicing)]
+
     use super::*;
     use crate::test_utils::TestContext;
 
@@ -772,7 +774,7 @@ mod tests {
         assert!(locations_ref[0].latitude < 51.423724f64);
         assert!(locations_ref[0].longitude >= 8.552556f64);
         assert!(locations_ref[0].longitude < 8.552557f64);
-        assert_eq!(locations_ref[0].accuracy, 0.0f64);
+        assert!(locations_ref[0].accuracy.abs() < f64::EPSILON);
         assert_eq!(locations_ref[0].timestamp, timestamp);
     }
 }
diff --git a/src/message.rs b/src/message.rs
index 861140850..b87aee441 100644
--- a/src/message.rs
+++ b/src/message.rs
@@ -1893,8 +1893,7 @@ mod tests {
         );
 
         assert_eq!(
-            get_summarytext_by_raw(Viewtype::Voice, no_text.as_ref(), &mut some_file, 50, &ctx)
-                .await,
+            get_summarytext_by_raw(Viewtype::Voice, no_text.as_ref(), &some_file, 50, &ctx).await,
             "Voice message" // file names are not added for voice messages
         );
 
@@ -1904,8 +1903,7 @@ mod tests {
         );
 
         assert_eq!(
-            get_summarytext_by_raw(Viewtype::Audio, no_text.as_ref(), &mut some_file, 50, &ctx)
-                .await,
+            get_summarytext_by_raw(Viewtype::Audio, no_text.as_ref(), &some_file, 50, &ctx).await,
             "Audio \u{2013} foo.bar" // file name is added for audio
         );
 
@@ -1921,8 +1919,7 @@ mod tests {
         );
 
         assert_eq!(
-            get_summarytext_by_raw(Viewtype::File, some_text.as_ref(), &mut some_file, 50, &ctx)
-                .await,
+            get_summarytext_by_raw(Viewtype::File, some_text.as_ref(), &some_file, 50, &ctx).await,
             "File \u{2013} foo.bar \u{2013} bla bla" // file name is added for files
         );
 
@@ -1930,7 +1927,7 @@ mod tests {
         asm_file.set(Param::File, "foo.bar");
         asm_file.set_cmd(SystemMessage::AutocryptSetupMessage);
         assert_eq!(
-            get_summarytext_by_raw(Viewtype::File, no_text.as_ref(), &mut asm_file, 50, &ctx).await,
+            get_summarytext_by_raw(Viewtype::File, no_text.as_ref(), &asm_file, 50, &ctx).await,
             "Autocrypt Setup Message" // file name is not added for autocrypt setup messages
         );
     }
@@ -2007,7 +2004,7 @@ mod tests {
         let chatitems = chat::get_chat_msgs(&t.ctx, device_chat_id, 0, None).await;
         for chatitem in chatitems {
             if let ChatItem::Message { msg_id } = chatitem {
-                if let Ok(msg) = Message::load_from_db(&t.ctx, msg_id.clone()).await {
+                if let Ok(msg) = Message::load_from_db(&t.ctx, msg_id).await {
                     if msg.get_viewtype() == Viewtype::Image {
                         has_image = true;
                         // just check that width/height are inside some reasonable ranges
diff --git a/src/mimeparser.rs b/src/mimeparser.rs
index 89ead0a80..40a2b5cc0 100644
--- a/src/mimeparser.rs
+++ b/src/mimeparser.rs
@@ -1318,6 +1318,8 @@ where
 
 #[cfg(test)]
 mod tests {
+    #![allow(clippy::indexing_slicing)]
+
     use super::*;
     use crate::test_utils::*;
 
diff --git a/src/param.rs b/src/param.rs
index ae551cd6a..bb32af3de 100644
--- a/src/param.rs
+++ b/src/param.rs
@@ -475,8 +475,8 @@ mod tests {
         );
 
         // Blob in blobdir, expect blob.
-        let bar = t.ctx.get_blobdir().join("bar");
-        p.set(Param::File, bar.to_str().unwrap());
+        let bar_path = t.ctx.get_blobdir().join("bar");
+        p.set(Param::File, bar_path.to_str().unwrap());
         let blob = p
             .get_blob(Param::File, &t.ctx, false)
             .await
diff --git a/src/pgp.rs b/src/pgp.rs
index ecfc5190e..73c6c3896 100644
--- a/src/pgp.rs
+++ b/src/pgp.rs
@@ -439,9 +439,9 @@ mod tests {
             let bob = bob_keypair();
             TestKeys {
                 alice_secret: alice.secret.clone(),
-                alice_public: alice.public.clone(),
+                alice_public: alice.public,
                 bob_secret: bob.secret.clone(),
-                bob_public: bob.public.clone(),
+                bob_public: bob.public,
             }
         }
     }
diff --git a/src/provider/mod.rs b/src/provider/mod.rs
index 51055cd21..c217813bb 100644
--- a/src/provider/mod.rs
+++ b/src/provider/mod.rs
@@ -93,6 +93,8 @@ pub fn get_provider_info(addr: &str) -> Option<&Provider> {
 
 #[cfg(test)]
 mod tests {
+    #![allow(clippy::indexing_slicing)]
+
     use super::*;
 
     #[test]