Correct test compilation failures for features not previously included.

Include `cargo test --no-run` for the same feature set as `cargo build`
to catch these errors in the future. #52 needs to be resolved to reduce
compile times before all features can be enabled.

.appveyor.yml

@@ -55,6 +55,7 @@ install:
 build: false
 test_script:
   - cargo build --verbose --no-default-features --features "usize isize bigint rational bigrational f32 f64 si std use_serde"
+  - cargo test --verbose --no-run --no-default-features --features "usize isize bigint rational bigrational f32 f64 si std use_serde"
   - cargo test --all --verbose --features "use_serde"
 
 notifications:

.travis.yml

@@ -31,6 +31,7 @@ before_script: |
 
 script: |
   cargo build --verbose --no-default-features --features "usize isize bigint rational bigrational f32 f64 si std use_serde" &&
+  cargo test --verbose --no-run --no-default-features --features "usize isize bigint rational bigrational f32 f64 si std use_serde" &&
   cargo test --verbose --features "use_serde $TRAVIS_RUST_VERSION" &&
   cargo test --manifest-path tests/feature_check/Cargo.toml --verbose --features "$TRAVIS_RUST_VERSION"
 

src/si/electric_potential.rs

@@ -58,7 +58,8 @@ mod tests {
             let _: ElectricPotential<V> = Area::new::<a::square_meter>(V::one())
                 * Mass::new::<m::kilogram>(V::one())
                 / (ElectricCurrent::new::<i::ampere>(V::one())
-                    * Time::new::<t::second>(V::one()).powi(::typenum::P3::new()));
+                    * (Time::new::<t::second>(V::one()) * Time::new::<t::second>(V::one())
+                        * Time::new::<t::second>(V::one())));
         }
 
         #[test]
@@ -89,7 +90,8 @@ mod tests {
                 Test::assert_approx_eq(&ElectricPotential::new::<E>(V::one()),
                     &(Area::new::<a::square_meter>(V::one()) * Mass::new::<m::kilogram>(V::one())
                         / (ElectricCurrent::new::<I>(V::one())
-                            * Time::new::<t::second>(V::one()).powi(::typenum::P3::new()))));
+                            * (Time::new::<t::second>(V::one()) * Time::new::<t::second>(V::one())
+                                * Time::new::<t::second>(V::one())))));
             }
         }
     }

src/si/energy.rs

@@ -83,7 +83,7 @@ mod tests {
         fn check_dimension() {
             let _: Energy<V> = Area::new::<a::square_meter>(V::one())
                 * Mass::new::<m::kilogram>(V::one())
-                / Time::new::<t::second>(V::one()).powi(::typenum::P2::new());
+                / (Time::new::<t::second>(V::one()) * Time::new::<t::second>(V::one()));
         }
 
         #[test]
@@ -110,7 +110,7 @@ mod tests {
                 Test::assert_approx_eq(&Energy::new::<E>(V::one()),
                     &(Area::new::<a::square_meter>(V::one())
                         * Mass::new::<M>(V::one())
-                        / Time::new::<t::second>(V::one()).powi(::typenum::P2::new())));
+                        / (Time::new::<t::second>(V::one()) * Time::new::<t::second>(V::one()))));
             }
         }
     }

src/si/ratio.rs

@@ -71,9 +71,8 @@ mod tests {
 
         #[test]
         fn from() {
-            let v = V::one();
-            let r1: Ratio<V> = Ratio::<V>::from(v);
-            let r2: Ratio<V> = v.into();
+            let r1: Ratio<V> = Ratio::<V>::from(V::one());
+            let r2: Ratio<V> = V::one().into();
             let _: V = V::from(r1);
             let _: V = r2.into();
         }