test: Add error messages to String.contains() asserts in tests

src/tests.rs

@@ -107,7 +107,8 @@ mod tests {
                 cmd,
                 output.status
             );
-            assert!(String::from_utf8_lossy(&output.stdout).contains("test content A"));
+            let output_str = String::from_utf8_lossy(&output.stdout).to_string();
+            assert!(output_str.contains("test content A"), "Command output does not contain expected string. Command: {}  Output: {}  Expected: \"test content A\"", cmd, output_str);
 
             let cmd = format!("{} -g 1", env);
             let output = run_sh(cmd.as_str());
@@ -117,7 +118,8 @@ mod tests {
                 cmd,
                 output.status
             );
-            assert!(String::from_utf8_lossy(&output.stdout).contains("test content A"));
+            let output_str = String::from_utf8_lossy(&output.stdout).to_string();
+            assert!(output_str.contains("test content A"), "Command output does not contain expected string. Command: {}  Output: {}  Expected: \"test content A\"", cmd, output_str);
 
             let cmd = format!("{} 1", env);
             let output = run_sh(cmd.as_str());
@@ -127,7 +129,8 @@ mod tests {
                 cmd,
                 output.status
             );
-            assert!(String::from_utf8_lossy(&output.stdout).contains("test content A"));
+            let output_str = String::from_utf8_lossy(&output.stdout).to_string();
+            assert!(output_str.contains("test content A"), "Command output does not contain expected string. Command: {}  Output: {}  Expected: \"test content A\"", cmd, output_str);
 
             let cmd = format!("{} --get", env);
             let output = run_sh(cmd.as_str());
@@ -137,7 +140,8 @@ mod tests {
                 cmd,
                 output.status
             );
-            assert!(String::from_utf8_lossy(&output.stdout).contains("test content B"));
+            let output_str = String::from_utf8_lossy(&output.stdout).to_string();
+            assert!(output_str.contains("test content B"), "Command output does not contain expected string. Command: {}  Output: {}  Expected: \"test content B\"", cmd, output_str);
 
             let cmd = format!("{} --get tag_a", env);
             let output = run_sh(cmd.as_str());
@@ -157,7 +161,8 @@ mod tests {
                 cmd,
                 output.status
             );
-            assert!(String::from_utf8_lossy(&output.stdout).contains("test content B"));
+            let output_str = String::from_utf8_lossy(&output.stdout).to_string();
+            assert!(output_str.contains("test content B"), "Command output does not contain expected string. Command: {}  Output: {}  Expected: \"test content B\"", cmd, output_str);
 
             let cmd = format!("{} --get tag", env);
             let output = run_sh(cmd.as_str());
@@ -167,7 +172,8 @@ mod tests {
                 cmd,
                 output.status
             );
-            assert!(String::from_utf8_lossy(&output.stdout).contains("test content B"));
+            let output_str = String::from_utf8_lossy(&output.stdout).to_string();
+            assert!(output_str.contains("test content B"), "Command output does not contain expected string. Command: {}  Output: {}  Expected: \"test content B\"", cmd, output_str);
         });
     }
 
@@ -308,7 +314,8 @@ mod tests {
                 output.status
             );
             // Output should be empty for non-existent item
-            assert!(String::from_utf8_lossy(&output.stdout).is_empty());
+            let output_str = String::from_utf8_lossy(&output.stdout).to_string();
+            assert!(output_str.is_empty(), "Command output is not empty. Command: {}  Output: {}", cmd, output_str);
         });
     }
 }