Add contains and does_not_contain assertion methods

src/assertions.zsh

@@ -3,7 +3,7 @@
 ################################
 
 ###
-# Assert one string is a substring if another
+# Assert one string is a substring of another
 ###
 function _zunit_assert_is_substring_of() {
   local value=$1 comparison=$2
@@ -15,7 +15,7 @@ function _zunit_assert_is_substring_of() {
 }
 
 ###
-# Assert one string is not a substring if another
+# Assert one string is not a substring of another
 ###
 function _zunit_assert_is_not_substring_of() {
   local value=$1 comparison=$2
@@ -26,6 +26,30 @@ function _zunit_assert_is_not_substring_of() {
   exit 1
 }
 
+###
+# Assert one string contains another
+###
+function _zunit_assert_contains() {
+  local value=$1 comparison=$2
+
+  [[ "$value" = *"$comparison"* ]] && return 0
+
+  echo "'$value' does not contain '$comparison'"
+  exit 1
+}
+
+###
+# Assert one string does not contain another
+###
+function _zunit_assert_does_not_contain() {
+  local value=$1 comparison=$2
+
+  [[ "$value" != *"$comparison"* ]] && return 0
+
+  echo "'$value' contains '$comparison'"
+  exit 1
+}
+
 ###
 # Assert that two integers are equal
 ###

tests/assertions/contains.zunit

@@ -0,0 +1,36 @@
+#!/usr/bin/env zunit
+
+@test 'Test _zunit_assert_contains match' {
+  run assert 'hello world' contains 'lo wo'
+
+  assert "$output" is_empty
+  assert $state equals 0
+}
+
+@test 'Test _zunit_assert_contains suffix match' {
+  run assert 'hello world' contains 'world'
+
+  assert "$output" is_empty
+  assert $state equals 0
+}
+
+@test 'Test _zunit_assert_contains prefix match' {
+  run assert 'hello world' contains 'hello'
+
+  assert "$output" is_empty
+  assert $state equals 0
+}
+
+@test 'Test _zunit_assert_contains whole word matches' {
+  run assert 'red blue green' contains 'red blue green'
+
+  assert "$output" is_empty
+  assert $state equals 0
+}
+
+@test 'Test _zunit_assert_contains match failure' {
+  run assert 'elephants' contains 'foo'
+
+  assert "$output" same_as "'elephants' does not contain 'foo'"
+  assert $state equals 1
+}

tests/assertions/does_not_contain.zunit

@@ -0,0 +1,15 @@
+#!/usr/bin/env zunit
+
+@test 'Test _zunit_assert_does_not_contain success' {
+    run assert 'yellow' does_not_contain 'foo'
+
+    assert "$output" is_empty
+    assert $state equals 0
+}
+
+@test 'Test _zunit_assert_does_not_contain failure' {
+    run assert 'foobar' does_not_contain 'foo'
+
+    assert "$output" same_as "'foobar' contains 'foo'"
+    assert $state equals 1
+}