fix: Remove unrelated output in main_binary

We use cargo run behind the scenes to run the main binary but that
should only be an implementation detail.

Fixes #45

Author: epage

src/assert.rs

@@ -26,7 +26,7 @@ impl default::Default for Assert {
     /// Defaults to asserting _successful_ execution.
     fn default() -> Self {
         Assert {
-            cmd: vec!["cargo", "run", "--"]
+            cmd: vec!["cargo", "run", "--quiet", "--"]
                 .into_iter()
                 .map(String::from)
                 .collect(),
@@ -53,7 +53,7 @@ impl Assert {
     /// Defaults to asserting _successful_ execution.
     pub fn cargo_binary(name: &str) -> Self {
         Assert {
-            cmd: vec!["cargo", "run", "--bin", name, "--"]
+            cmd: vec!["cargo", "run", "--quiet", "--bin", name, "--"]
                 .into_iter()
                 .map(String::from)
                 .collect(),

tests/cargo.rs

@@ -5,7 +5,9 @@ fn main_binary() {
     assert_cli::Assert::main_binary()
         .with_env(assert_cli::Environment::inherit().insert("stdout", "42"))
         .stdout()
-        .contains("42")
+        .is("42")
+        .stderr()
+        .is("")
         .unwrap();
 }
 
@@ -14,6 +16,8 @@ fn cargo_binary() {
     assert_cli::Assert::cargo_binary("assert_fixture")
         .with_env(assert_cli::Environment::inherit().insert("stdout", "42"))
         .stdout()
-        .contains("42")
+        .is("42")
+        .stderr()
+        .is("")
         .unwrap();
 }