update tests to use the usage error message prefix.

tests/test_apply.rs

@@ -14,7 +14,7 @@ fn apply_ops_unknown_operation() {
         .arg("data.csv");
 
     let got: String = wrk.output_stderr(&mut cmd);
-    assert_eq!(&*got, "usage: Unknown 'obfuscate' operation\n")
+    assert_eq!(&*got, "usage error: Unknown 'obfuscate' operation\n")
 }
 
 #[test]
@@ -133,7 +133,7 @@ fn apply_ops_upper_rename_invalid() {
     let got: String = wrk.output_stderr(&mut cmd);
     assert_eq!(
         got,
-        "usage: Number of new columns does not match input column selection.\n"
+        "usage error: Number of new columns does not match input column selection.\n"
     );
 }
 
@@ -909,7 +909,8 @@ fn apply_ops_replace_validation_error() {
     let got = wrk.output_stderr(&mut cmd);
     assert_eq!(
         got,
-        "usage: --comparand (-C) and --replacement (-R) are required for replace operation.\n"
+        "usage error: --comparand (-C) and --replacement (-R) are required for replace \
+         operation.\n"
     );
     wrk.assert_err(&mut cmd);
 }
@@ -972,7 +973,7 @@ fn apply_ops_regex_replace_validation_error() {
     let got = wrk.output_stderr(&mut cmd);
     assert_eq!(
         got,
-        "usage: --comparand (-C) and --replacement (-R) are required for regex_replace \
+        "usage error: --comparand (-C) and --replacement (-R) are required for regex_replace \
          operation.\n"
     );
     wrk.assert_err(&mut cmd);
@@ -1092,8 +1093,9 @@ fn apply_ops_chain_validation_error() {
     let got = wrk.output_stderr(&mut cmd);
     assert_eq!(
         got,
-        "usage: you can only use censor(0), copy(0), eudex(0), regex_replace(0), replace(0), \
-         sentiment(0), similarity(2), strip(0), and whatlang(0) ONCE per operation series.\n"
+        "usage error: you can only use censor(0), copy(0), eudex(0), regex_replace(0), \
+         replace(0), sentiment(0), similarity(2), strip(0), and whatlang(0) ONCE per operation \
+         series.\n"
     );
     wrk.assert_err(&mut cmd);
 }
@@ -1116,7 +1118,8 @@ fn apply_ops_chain_validation_error_missing_comparand() {
     let got = wrk.output_stderr(&mut cmd);
     assert_eq!(
         got,
-        "usage: --comparand (-C) and --new_column (-c) is required for similarity operations.\n"
+        "usage error: --comparand (-C) and --new_column (-c) is required for similarity \
+         operations.\n"
     );
     wrk.assert_err(&mut cmd);
 }

tests/test_excel.rs

@@ -323,7 +323,7 @@ fn excel_invalid_sheet_index() {
     cmd.arg("--sheet").arg("100").arg(xls_file);
 
     let got = wrk.output_stderr(&mut cmd);
-    let expected = "usage: sheet index 100 is greater than number of sheets 8\n".to_string();
+    let expected = "usage error: sheet index 100 is greater than number of sheets 8\n".to_string();
     assert_eq!(got, expected);
     wrk.assert_err(&mut cmd);
 }

tests/test_fetch.rs

@@ -335,7 +335,7 @@ fn fetch_jql_jqlfile_error() {
         .arg("data.csv");
 
     let got: String = wrk.output_stderr(&mut cmd);
-    assert!(got.starts_with("usage: Invalid arguments."));
+    assert!(got.starts_with("usage error: Invalid arguments."));
 
     wrk.assert_err(&mut cmd);
 }
@@ -455,7 +455,7 @@ fn fetch_custom_invalid_header_error() {
         .arg("data.csv");
 
     let got: String = wrk.output_stderr(&mut cmd);
-    assert!(got.starts_with("usage: Invalid header name"));
+    assert!(got.starts_with("usage error: Invalid header name"));
 
     wrk.assert_err(&mut cmd);
 }
@@ -475,7 +475,7 @@ fn fetch_custom_invalid_user_agent_error() {
         .arg("data.csv");
 
     let got: String = wrk.output_stderr(&mut cmd);
-    assert!(got.starts_with("usage: Invalid user-agent"));
+    assert!(got.starts_with("usage error: Invalid user-agent"));
 
     wrk.assert_err(&mut cmd);
 }
@@ -534,7 +534,7 @@ fn fetch_custom_invalid_value_error() {
         .arg("data.csv");
 
     let got: String = wrk.output_stderr(&mut cmd);
-    assert!(got.starts_with("usage: Invalid header value"));
+    assert!(got.starts_with("usage error: Invalid header value"));
 
     wrk.assert_err(&mut cmd);
 }
@@ -559,7 +559,7 @@ fn fetchpost_custom_invalid_header_error() {
         .arg("data.csv");
 
     let got: String = wrk.output_stderr(&mut cmd);
-    assert!(got.starts_with("usage: Invalid header name"));
+    assert!(got.starts_with("usage error: Invalid header name"));
 
     wrk.assert_err(&mut cmd);
 }
@@ -584,7 +584,7 @@ fn fetchpost_custom_invalid_value_error() {
         .arg("data.csv");
 
     let got: String = wrk.output_stderr(&mut cmd);
-    assert!(got.starts_with("usage: Invalid header value"));
+    assert!(got.starts_with("usage error: Invalid header value"));
 
     wrk.assert_err(&mut cmd);
 }
@@ -610,7 +610,7 @@ fn fetchpost_custom_invalid_user_agent_error() {
         .arg("data.csv");
 
     let got: String = wrk.output_stderr(&mut cmd);
-    assert!(got.starts_with("usage: Invalid user-agent"));
+    assert!(got.starts_with("usage error: Invalid user-agent"));
 
     wrk.assert_err(&mut cmd);
 }

tests/test_table.rs

@@ -88,7 +88,7 @@ fn invalid_delimiter_len() {
     let got: String = wrk.output_stderr(&mut cmd);
     assert_eq!(
         &*got,
-        "usage: Could not convert '||' to a single ASCII character.\n"
+        "usage error: Could not convert '||' to a single ASCII character.\n"
     )
 }