diff --git a/.github/workflows/cargo.yml b/.github/workflows/cargo.yml
new file mode 100644
index 0000000..91130b0
--- /dev/null
+++ b/.github/workflows/cargo.yml
@@ -0,0 +1,43 @@
+name: cargo
+on: [push]
+
+jobs:
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - run: rustup component add rustfmt
+      - run: cargo fmt --all --check
+  cargo:
+    strategy:
+      matrix:
+        task: ["clippy", "build", "test"]
+        feature_set: ["default", "no-std", "no-std-alloc", "no-std-alloc-serde", "no-serde"]
+        include:
+          - task: "clippy"
+            extra_flags: "--deny warnings"
+          - task: "build"
+            extra_flags: ""
+          - task: "test"
+            extra_flags: ""
+          - feature_set: "default"
+            feature_flags: ""
+            target_flags: "--all-targets"
+          - feature_set: "no-std"
+            feature_flags: "--no-default-features --features libm"
+            target_flags: "--lib"
+          - feature_set: "no-std-alloc"
+            feature_flags: "--no-default-features --features libm --features alloc"
+            target_flags: "--lib"
+          - feature_set: "no-std-alloc-serde"
+            feature_flags: "--no-default-features --features libm --features alloc --features serde"
+            target_flags: "--lib"
+          - feature_set: "no-serde"
+            feature_flags: "--no-default-features --features std"
+            target_flags: "--lib --tests --benches --example tle --example tle_afspc"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - run: cargo ${{ matrix.task }} ${{ matrix.feature_flags }} ${{ matrix.target_flags }} -- ${{ matrix.extra_flags }}
diff --git a/.github/workflows/ci_no_std.yml b/.github/workflows/ci_no_std.yml
deleted file mode 100644
index 8091d31..0000000
--- a/.github/workflows/ci_no_std.yml
+++ /dev/null
@@ -1,49 +0,0 @@
-name: no-std check
-on: [push]
-
-jobs:
-  format_check:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
-      - run: rustup component add rustfmt
-      - uses: actions-rs/cargo@v1
-        with:
-          command: fmt
-          args: --all --check
-  lib:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          override: true
-      - uses: actions-rs/cargo@v1
-        with:
-          command: clippy
-          args: --no-default-features --features libm -- -D warnings
-      - uses: actions-rs/cargo@v1
-        with:
-          command: build
-          args: --no-default-features --features libm
-
-  tests:
-    needs: lib
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
-      - uses: actions-rs/cargo@v1
-        with:
-          command: test
-          args: --tests --no-default-features --features libm --features serde --features alloc
\ No newline at end of file
diff --git a/.github/workflows/ci_std.yml b/.github/workflows/ci_std.yml
deleted file mode 100644
index a712bac..0000000
--- a/.github/workflows/ci_std.yml
+++ /dev/null
@@ -1,65 +0,0 @@
-name: std check
-on: [push]
-
-jobs:
-  format_check:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
-      - run: rustup component add rustfmt
-      - uses: actions-rs/cargo@v1
-        with:
-          command: fmt
-          args: --all --check
-  lib:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          override: true
-      - uses: actions-rs/cargo@v1
-        with:
-          command: clippy
-          args: -- -D warnings
-      - uses: actions-rs/cargo@v1
-        with:
-          command: build
-
-  tests:
-    needs: lib
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
-      - uses: actions-rs/cargo@v1
-        with:
-          command: clippy
-          args: --tests -- -D warnings
-      - uses: actions-rs/cargo@v1
-        with:
-          command: test
-
-  examples:
-    needs: lib
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          override: true
-      - uses: actions-rs/cargo@v1
-        with:
-          command: clippy
-          args: --examples -- -D warnings
diff --git a/Cargo.toml b/Cargo.toml
index 7eb033d..033e9c1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,28 +19,26 @@ categories = [
 ]
 keywords = ["SGP4", "SDP4", "TLE", "OMM"]
 edition = "2021"
+resolver = "2"
 
 [dependencies]
-anyhow = { version = "1.0", default-features = false, optional = true }
-chrono = { version = "0.4.38", default-features = false }
-serde = { version = "1.0", default-features = false, optional = true }
-serde_json = { version = "1.0", default-features = false, optional = true }
-num-traits = { version = "0.2.19", default-features = false, optional = true }
+chrono = {version = "0.4.38", default-features = false}
+serde = {version = "1.0", default-features = false, optional = true}
+serde_json = {version = "1.0", default-features = false, optional = true}
+num-traits = {version = "0.2.19", default-features = false, optional = true}
 
 [dev-dependencies]
+anyhow = {version = "1.0", default-features = false}
 criterion = "0.5.1"
 toml = "0.8.13"
-ureq = { version = "2.9.7", features = ["json"] }
-serde_json = { version = "1.0", default-features = false }
-serde = { version = "1.0", default-features = false }
-anyhow = { version = "1.0", default-features = false }
+ureq = {version = "2.9.7", features = ["json"]}
 
 [package.metadata.docs.rs]
 rustdoc-args = ["--cfg", "docsrs"]
 
 [features]
-default = ["alloc", "serde", "std"]
-alloc = ["anyhow"]
+default = ["alloc", "std", "serde"]
+alloc = []
 serde = [
     "alloc",
     "chrono/serde",
@@ -49,7 +47,7 @@ serde = [
     "serde_json/alloc",
 ]
 std = ["alloc", "anyhow/std", "chrono/std", "serde?/std", "serde_json?/std"]
-libm = ["num-traits/libm"]
+libm = ["dep:num-traits", "num-traits/libm"]
 
 [[bench]]
 name = "propagate"
diff --git a/benches/propagate.rs b/benches/propagate.rs
index 2eb7a3f..6c09afe 100644
--- a/benches/propagate.rs
+++ b/benches/propagate.rs
@@ -1,10 +1,10 @@
 use criterion::{criterion_group, criterion_main, Criterion};
-#[path = "../test_cases.rs"]
+#[path = "../tests/test_cases.rs"]
 mod test_cases;
 use test_cases::*;
 
 pub fn criterion_benchmark(criterion: &mut Criterion) {
-    let test_cases: TestCases = toml::from_str(include_str!("../test_cases.toml")).unwrap();
+    let test_cases: TestCases = toml::from_str(include_str!("../tests/test_cases.toml")).unwrap();
     criterion.bench_function("propagate all", |b| {
         b.iter(|| {
             let mut predictions = Vec::new();
diff --git a/src/tle.rs b/src/tle.rs
index 5a3ffc6..b1e694b 100644
--- a/src/tle.rs
+++ b/src/tle.rs
@@ -991,11 +991,11 @@ pub fn parse_3les(tles: &str) -> core::result::Result<alloc::vec::Vec<Elements>,
     Ok(elements_vec)
 }
 
+#[cfg(feature = "serde")]
 #[cfg(test)]
 mod tests {
     use super::*;
 
-    #[cfg(feature = "serde")]
     fn assert_eq_f64(first: f64, second: f64) {
         if second == 0.0 {
             assert_eq!(first, 0.0);
@@ -1004,7 +1004,6 @@ mod tests {
         }
     }
 
-    #[cfg(feature = "serde")]
     #[test]
     fn test_from_celestrak_omm() -> anyhow::Result<()> {
         let elements: Elements = serde_json::from_str(
@@ -1069,7 +1068,6 @@ mod tests {
     }
 
     #[test]
-    #[cfg(feature = "alloc")]
     fn test_from_space_track_omm() -> anyhow::Result<()> {
         let elements: Elements = serde_json::from_str(
             r#"{"CCSDS_OMM_VERS":"2.0",
@@ -1152,7 +1150,6 @@ mod tests {
     }
 
     #[test]
-    #[cfg(feature = "alloc")]
     fn test_from_celestrak_omms() -> anyhow::Result<()> {
         let elements_vec: [Elements; 2] = serde_json::from_str(
             r#"[{
@@ -1199,7 +1196,6 @@ mod tests {
     }
 
     #[test]
-    #[cfg(feature = "alloc")]
     fn test_from_tle() -> core::result::Result<(), Error> {
         let elements = Elements::from_tle(
             Some("ISS (ZARYA)".into()),
@@ -1283,9 +1279,9 @@ mod tests {
     }
 
     #[test]
-    fn from_tle_rounding_error_prone_epoch() -> core::result::Result<(), Error> {
+    fn test_rounding_error_prone_epoch() -> core::result::Result<(), Error> {
         let elements = Elements::from_tle(
-            Some("ISS (ZARYA)".to_string()),
+            None,
             "1 25544U 98067A   23001.00031250  .00023190  00000-0  40700-3 0  9996".as_bytes(),
             "2 25544  51.6422 151.7482 0002260  30.8955 315.0781 15.50422841429866".as_bytes(),
         )?;
@@ -1300,7 +1296,6 @@ mod tests {
     }
 
     #[test]
-    #[cfg(feature = "alloc")]
     fn test_parse_2les() -> core::result::Result<(), Error> {
         let elements_vec = parse_2les(
             "1 25544U 98067A   20194.88612269 -.00002218  00000-0 -31515-4 0  9992\n\
@@ -1313,7 +1308,6 @@ mod tests {
     }
 
     #[test]
-    #[cfg(feature = "alloc")]
     fn test_parse_3les() -> core::result::Result<(), Error> {
         let elements_vec = parse_3les(
             "ISS (ZARYA)\n\
diff --git a/tests/propagate.rs b/tests/propagate.rs
index 4e7c553..a454f60 100644
--- a/tests/propagate.rs
+++ b/tests/propagate.rs
@@ -1,10 +1,10 @@
-#[path = "../test_cases.rs"]
+#[path = "test_cases.rs"]
 mod test_cases;
 use test_cases::*;
 
 #[test]
 fn propagate() -> anyhow::Result<()> {
-    let test_cases: TestCases = toml::from_str(include_str!("../test_cases.toml")).unwrap();
+    let test_cases: TestCases = toml::from_str(include_str!("test_cases.toml")).unwrap();
     for test_case in test_cases.list.iter() {
         #[cfg(feature = "alloc")]
         let element =
diff --git a/test_cases.rs b/tests/test_cases.rs
similarity index 100%
rename from test_cases.rs
rename to tests/test_cases.rs
diff --git a/test_cases.toml b/tests/test_cases.toml
similarity index 100%
rename from test_cases.toml
rename to tests/test_cases.toml