added basic tests

internal/common/strings_test.go

@@ -0,0 +1,37 @@
+package common
+
+import "testing"
+
+func TestUnify(t *testing.T) {
+	if "foo" != Unify("foo") {
+		t.Errorf(`"foo" has to be untouched by unify`)
+	}
+
+	if "foo" != Unify("Foo") {
+		t.Errorf(`"Foo" needs to be lowercase after test`)
+	}
+
+	if "foo" != Unify(" Foo") {
+		t.Errorf(`The spaces need to be stripped`)
+	}
+
+	if "foo" != Unify(" Foo  ") {
+		t.Errorf(`The spaces need to be stripped`)
+	}
+
+	if "foo bar" != Unify("Foo bar") {
+		t.Errorf(`Single whitespaces need to be left alone`)
+	}
+
+	if "foo bar" != Unify("Foo  bar") {
+		t.Errorf(`Double whitespaces need to be removed`)
+	}
+
+	if "foo bar" != Unify("Foo   bar") {
+		t.Errorf(`Double whitespaces need to be removed`)
+	}
+
+	if "foo bar baz" != Unify("Foo   bar baz") {
+		t.Errorf(`Double whitespaces need to be removed`)
+	}
+}