chore: add missing test before a refactoring

Author: ccoVeille

conversion_test.go

@@ -1690,13 +1690,37 @@ func TestConvert(t *testing.T) {
 		"boolean true":                MapTest[bool, uint]{Input: true, ExpectedOutput: 1},
 		"boolean false":               MapTest[bool, uint]{Input: false, ExpectedOutput: 0},
 
-		"empty string":                           MapTest[string, uint]{Input: "", ExpectedError: safecast.ErrStringConversion},
-		"simple space":                           MapTest[string, uint]{Input: " ", ExpectedError: safecast.ErrStringConversion},
-		"simple dot":                             MapTest[string, uint]{Input: ".", ExpectedError: safecast.ErrStringConversion},
-		"simple dash":                            MapTest[string, uint]{Input: "-", ExpectedError: safecast.ErrStringConversion},
-		"invalid string":                         MapTest[string, uint]{Input: "abc", ExpectedError: safecast.ErrStringConversion},
-		"invalid string with dot":                MapTest[string, uint]{Input: "ab.c", ExpectedError: safecast.ErrStringConversion},
-		"strings with leading +":                 MapTest[string, uint]{Input: "+42", ExpectedError: safecast.ErrStringConversion},
+		"empty string": MapTest[string, uint]{
+			Input:         "",
+			ExpectedError: safecast.ErrStringConversion,
+			ErrorContains: "cannot convert from string  to uint",
+		},
+		"simple space": MapTest[string, uint]{
+			Input:         " ",
+			ExpectedError: safecast.ErrStringConversion,
+			ErrorContains: "cannot convert from string  to uint",
+		},
+		"simple dot": MapTest[string, uint]{
+			Input:         ".",
+			ExpectedError: safecast.ErrStringConversion,
+			ErrorContains: "cannot convert from string . to uint"},
+		"simple dash": MapTest[string, uint]{
+			Input:         "-",
+			ExpectedError: safecast.ErrStringConversion,
+			ErrorContains: "cannot convert from string - to uint"},
+		"invalid string": MapTest[string, uint]{
+			Input:         "abc",
+			ExpectedError: safecast.ErrStringConversion,
+			ErrorContains: `cannot convert from string abc to uint`},
+		"invalid string with dot": MapTest[string, uint]{
+			Input:         "ab.c",
+			ExpectedError: safecast.ErrStringConversion,
+			ErrorContains: `cannot convert from string ab.c to uint`},
+		"strings with leading +": MapTest[string, uint]{
+			Input:         "+42",
+			ExpectedError: safecast.ErrStringConversion,
+			ErrorContains: "cannot convert from string +42 to uint",
+		},
 		"invalid string multiple leading dashes": MapTest[string, uint]{Input: "--42", ExpectedError: safecast.ErrStringConversion},
 		"invalid string with dash":               MapTest[string, uint]{Input: "-abc", ExpectedError: safecast.ErrStringConversion},
 		"invalid string with dash and dot":       MapTest[string, uint]{Input: "-ab.c", ExpectedError: safecast.ErrStringConversion},