diff --git a/Cargo.lock b/Cargo.lock
index ec8da89ee..8474b64a3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1002,19 +1002,6 @@ name = "log"
 version = "0.4.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f9f8bd3e56ce4dfc153cf470fffbfa98c7620958b312ca5c3a4b8d5181fd13c6"
-dependencies = [
- "value-bag",
-]
-
-[[package]]
-name = "logtest"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eb3e43a8657c1d64516dcc9db8ca03826a4aceaf89d5ce1b37b59f6ff0e43026"
-dependencies = [
- "lazy_static",
- "log",
-]
 
 [[package]]
 name = "map-macro"
@@ -1070,7 +1057,6 @@ dependencies = [
  "indexmap",
  "itertools 0.15.0",
  "log",
- "logtest",
  "map-macro",
  "ordered-float",
  "petgraph",
@@ -1823,12 +1809,6 @@ dependencies = [
  "getrandom 0.4.3",
 ]
 
-[[package]]
-name = "value-bag"
-version = "1.14.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2799ffb329a792ecfd902b71306c8a815a6ef1c0470fa9953a6aa4d4cecbe511"
-
 [[package]]
 name = "vcpkg"
 version = "0.2.15"
diff --git a/Cargo.toml b/Cargo.toml
index 102234b25..a4e352806 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -44,7 +44,6 @@ rayon = "1.12.0"
 assert_cmd = "2.2.2"
 colored = "3.0.0"
 criterion = "0.8.2"
-logtest = "2.0.0"
 ordered-float = "5.1.0"
 rstest = {version = "0.26.1", default-features = false, features = ["crate-name"]}
 similar = "3.1.0"
diff --git a/src/input/process/investment_constraints.rs b/src/input/process/investment_constraints.rs
index f8054addd..7118ac9de 100644
--- a/src/input/process/investment_constraints.rs
+++ b/src/input/process/investment_constraints.rs
@@ -216,7 +216,6 @@ mod tests {
     use crate::fixture::{assert_error, processes};
     use crate::region::RegionID;
     use crate::units::Capacity;
-    use logtest::Logger;
     use rstest::rstest;
 
     fn validate_raw_constraint(
@@ -445,24 +444,33 @@ mod tests {
     }
 
     #[rstest]
-    #[case(Some(CapacityPerYear(10.0)), None, None, None)]
-    #[case(Some(CapacityPerYear(0.0)), None, None, None)]
-    #[case(Some(CapacityPerYear(10.0)), Some(Dimensionless(0.5)), None, None)]
-    #[case(Some(CapacityPerYear(10.0)), Some(Dimensionless(0.0)), None, None)]
-    #[case(Some(CapacityPerYear(10.0)), None, None, Some(Capacity(100.0)))]
-    #[case(Some(CapacityPerYear(10.0)), None, None, Some(Capacity(0.0)))]
+    #[case(Some(CapacityPerYear(10.0)), None, None)] // only addition limits
+    #[case(Some(CapacityPerYear(0.0)), None, None)] // zero addition limit
+    #[case(None, Some(Dimensionless(0.5)), None)] // only growth limit
+    #[case(None, Some(Dimensionless(0.0)), None)] // zero growth limit
+    #[case(None, Some(Dimensionless(1.0)), None)] // growth limit exactly 1
+    #[case(None, Some(Dimensionless(5.0)), None)] // growth limit > 1 (TODO: test that this raises a warning)
+    #[case(None, None, Some(Capacity(100.0)))] // only total limit
+    #[case(None, None, Some(Capacity(0.0)))] // zero total limit
+    #[case(
+        Some(CapacityPerYear(1.0)),
+        Some(Dimensionless(0.1)),
+        Some(Capacity(100.0))
+    )] // all limits, all positive
+    #[case(
+        Some(CapacityPerYear(0.0)),
+        Some(Dimensionless(0.0)),
+        Some(Capacity(0.0))
+    )] // all limits, all zero
     fn validate_constraints_valid(
         #[case] addition_limit: Option<CapacityPerYear>,
         #[case] capacity_growth_limit: Option<Dimensionless>,
-        #[case] growth_seed: Option<Dimensionless>,
         #[case] total_capacity_limit: Option<Capacity>,
     ) {
-        // Valid: capacity constraints with values >= 0, and capacity_growth_limit and
-        // total_capacity_limit as None
         let valid = validate_raw_constraint(
             addition_limit,
             capacity_growth_limit,
-            growth_seed,
+            None,
             total_capacity_limit,
         );
         valid.unwrap();
@@ -585,22 +593,6 @@ mod tests {
         assert_error!(invalid, error_msg);
     }
 
-    #[test]
-    fn validate_capacity_growth_limit_warning() {
-        // Check warning raised if value above 1 provided
-        let mut logger = Logger::start();
-        let _ = validate_raw_constraint(
-            Some(CapacityPerYear(10.0)),
-            Some(Dimensionless(5.0)),
-            None,
-            None,
-        );
-        assert_eq!(
-            logger.pop().unwrap().args(),
-            "Interpreting capacity growth constraint '5' as 500%"
-        );
-    }
-
     #[rstest]
     #[case(Some(CapacityPerYear(10.0)), None, None, None)]
     #[case(Some(CapacityPerYear(10.0)), None, Some(Dimensionless(1.0)), None)]