test(vars): Vars mocking

Implemented var mocking in order to sue in tests, especially clap tests

src/options/vars.rs

@@ -91,3 +91,56 @@ impl Vars for Option<OsString> {
         self.clone()
     }
 }
+
+#[cfg(test)]
+#[allow(dead_code)]
+pub struct MockVars {
+    columns: OsString,
+    colors: OsString,
+    no_colors: OsString,
+    strict: OsString,
+    debug: OsString,
+    grid_rows: OsString,
+    icon_spacing: OsString,
+    luminance: OsString,
+    icons: OsString,
+}
+
+#[cfg(test)]
+#[allow(dead_code)]
+impl Vars for MockVars {
+    fn get(&self, name: &'static str) -> Option<OsString> {
+        match name {
+            "EXA_STRICT" | "EZA_STRICT" => Some(self.strict.clone()),
+            "EZA_COLORS" | "LS_COLORS" | "EXA_COLORS" => Some(self.colors.clone()),
+            "EXA_DEBUG" | "EZA_DEBUG" => Some(self.debug.clone()),
+            "EXA_GRID_ROWS" | "EZA_GRID_ROWS" => Some(self.grid_rows.clone()),
+            "EXA_ICON_SPACING" | "EZA_ICON_SPACING" => Some(self.icon_spacing.clone()),
+            "EXA_MIN_LUMINANCE" | "EZA_MIN_LUMINANCE" => Some(self.luminance.clone()),
+            "EZA_ICONS_AUTO" => Some(self.icons.clone()),
+            "COLUMNS" => Some(self.columns.clone()),
+            "NO_COLOR" => Some(self.no_colors.clone()),
+            _ => None,
+        }
+    }
+}
+
+#[cfg(test)]
+#[allow(dead_code)]
+impl MockVars {
+    pub fn set(&mut self, var: &'static str, value: &OsString) {
+        match var {
+            "EXA_STRICT" | "EZA_STRICT" => self.strict = value.clone(),
+            "EZA_COLORS" | "LS_COLORS" | "EXA_COLORS" => self.colors = value.clone(),
+            "EXA_DEBUG" | "EZA_DEBUG" => self.debug = value.clone(),
+            "EXA_GRID_ROWS" | "EZA_GRID_ROWS" => self.grid_rows = value.clone(),
+            "EXA_ICON_SPACING" | "EZA_ICON_SPACING" => self.icon_spacing = value.clone(),
+            "EXA_MIN_LUMINANCE" | "EZA_MIN_LUMINANCE" => self.luminance = value.clone(),
+            "EZA_ICONS_AUTO" => self.icons = value.clone(),
+            "COLUMNS" => self.columns = value.clone(),
+            "NO_COLOR" => self.no_colors = value.clone(),
+            _ => (),
+        };
+        ()
+    }
+}