Lots of test cleanup.

test/suggestion_test.zsh

@@ -0,0 +1,72 @@
+#!/usr/bin/env zsh
+
+source "${0:a:h}/test_helper.zsh"
+
+oneTimeSetUp() {
+	source_autosuggestions
+}
+
+testEscapeCommand() {
+	assertEquals \
+		'Did not escape single backslash' \
+		'\\' \
+		"$(_zsh_autosuggest_escape_command '\')"
+
+	assertEquals \
+		'Did not escape two backslashes' \
+		'\\\\' \
+		"$(_zsh_autosuggest_escape_command '\\')"
+
+	assertEquals \
+		'Did not escape parentheses' \
+		'\(\)' \
+		"$(_zsh_autosuggest_escape_command '()')"
+
+	assertEquals \
+		'Did not escape square brackets' \
+		'\[\]' \
+		"$(_zsh_autosuggest_escape_command '[]')"
+
+	assertEquals \
+		'Did not escape pipe' \
+		'\|' \
+		"$(_zsh_autosuggest_escape_command '|')"
+
+	assertEquals \
+		'Did not escape star' \
+		'\*' \
+		"$(_zsh_autosuggest_escape_command '*')"
+
+	assertEquals \
+		'Did not escape question mark' \
+		'\?' \
+		"$(_zsh_autosuggest_escape_command '?')"
+}
+
+testPrevCommand() {
+	set_history <<-'EOF'
+		ls foo
+		ls bar
+		ls baz
+	EOF
+
+	assertEquals \
+		'Did not output the last command' \
+		'ls baz' \
+		"$(_zsh_autosuggest_prev_command)"
+
+	set_history <<-'EOF'
+		ls foo
+		ls bar
+		ls baz
+		ls quux
+		ls foobar
+	EOF
+
+	assertEquals \
+		'Did not output the last command' \
+		'ls foobar' \
+		"$(_zsh_autosuggest_prev_command)"
+}
+
+run_tests "$0"