@Test
public void testNotEndsWith() {
// GIVEN
String expected = "value";
String actual = "value test";
// WHEN / THEN
GAssert.assertNotEndsWith(expected, actual);
}
@Test
public void testStartsWith() {
// GIVEN
String expected = "test";
String actual = "test value";
// WHEN / THEN
GAssert.assertStartsWith(expected, actual);
}
@Test
public void testAssertEquals_list() {
// GIVEN
ImmutableList<String> expected = ImmutableList.of("a");
ImmutableList<String> actual = ImmutableList.of("a");
// WHEN / THEN
GAssert.assertEquals(expected, actual);
}
@Test
public void testAssertEquals_list_null() {
// GIVEN
ImmutableList<String> expected = null;
ImmutableList<String> actual = null;
// WHEN / THEN
GAssert.assertEquals(expected, actual);
}
@Test
public void testAssertEquals_map() {
// GIVEN
ImmutableMap<String, String> expected = ImmutableMap.of("a", "a");
ImmutableMap<String, String> actual = ImmutableMap.of("a", "a");
// WHEN / THEN
GAssert.assertEquals(expected, actual);
}
@Test
public void testNotEndsWith_actualToShort_fail() {
// GIVEN
String expected = "test";
String actual = "lue";
// WHEN
GAssert.assertNotEndsWith(expected, actual);
// THEN
}
@Test
public void testAssertEquals_listTypes_fail() {
// GIVEN
ImmutableList<String> expected = ImmutableList.of("a");
ImmutableList<Integer> actual = ImmutableList.of(4);
try {
// WHEN
GAssert.assertEquals(expected, actual);
fail();
} catch (ComparisonFailure e) {
// THEN
assertEquals("expected:<[a]> but was:<[4]>", e.getMessage());
}
}
@Test
public void testAssertEquals_list_null_expected() {
// GIVEN
ImmutableList<String> expected = null;
ImmutableList<String> actual = ImmutableList.of("a");
try {
// WHEN
GAssert.assertEquals(expected, actual);
fail();
} catch (AssertionError e) {
// THEN
assertEquals("expected:<null> but was:<a>", e.getMessage());
}
}
@Test
public void testAssertEquals_map_value_fail() {
// GIVEN
ImmutableMap<String, String> expected = ImmutableMap.of("a", "a");
ImmutableMap<String, String> actual = ImmutableMap.of("a", "b");
try {
// WHEN
GAssert.assertEquals(expected, actual);
fail();
} catch (ComparisonFailure e) {
// THEN
assertEquals("expected:<a=[a]> but was:<a=[b]>", e.getMessage());
}
}
@Test
public void testEndsWith_fail_toShort() {
// GIVEN
String expected = "";
String actual = "test value";
try {
// WHEN
GAssert.assertEndsWith(expected, actual);
fail();
} catch (AssertionError e) {
// THEN
assertEquals(
"expected value: \"\" is too short expected:<[]> but was:<[test value]>", e.getMessage());
}
}
@Test
public void testNotEndsWith_fail_toShort() {
// GIVEN
String expected = "";
String actual = "test value";
try {
// WHEN
GAssert.assertNotEndsWith(expected, actual);
fail();
} catch (AssertionError e) {
// THEN
assertEquals(
"Expected: not a string ending with \"\"\n" //
+ " but: was \"test value\" expected:<[]> but was:<[test value]>",
e.getMessage());
}
}
@Test
public void testNotEndsWith_fail() {
// GIVEN
String expected = "test";
String actual = "value test";
try {
// WHEN
GAssert.assertNotEndsWith(expected, actual);
fail();
} catch (ComparisonFailure e) {
// THEN
assertEquals(
"Expected: not a string ending with \"test\"\n" //
+ " but: was \"value test\" expected:<[]test> but was:<[value ]test>",
e.getMessage());
}
}
@Test
public void testEndsWith_actualToShort_fail() {
// GIVEN
String expected = "test";
String actual = "lue";
try {
// WHEN
GAssert.assertEndsWith(expected, actual);
fail();
} catch (ComparisonFailure e) {
// THEN
assertEquals(
"Expected: a string ending with \"test\"\n" //
+ " but: was \"lue\" expected:<[test]> but was:<[lue]>",
e.getMessage());
}
}
@Test
public void testStartsWith_fail() {
// GIVEN
String expected = "value";
String actual = "test value";
try {
// WHEN
GAssert.assertStartsWith(expected, actual);
fail();
} catch (ComparisonFailure e) {
// THEN
assertEquals(
"Expected: a string starting with \"value\"\n" //
+ " but: was \"test value\" expected:<[]value> but was:<[test ]value>",
e.getMessage());
}
}
@Test
public void testAssertEquals_map_value_types_fail() {
// GIVEN
ImmutableMap<String, Integer> expected = ImmutableMap.of("a", 4);
ImmutableMap<String, String> actual = ImmutableMap.of("a", "b");
try {
// WHEN
GAssert.assertEquals(expected, actual);
fail();
} catch (ComparisonFailure e) {
// THEN
assertEquals(
"expected:<...java.lang.String]}={[4 [java.lang.Integer]]}> "
+ "but was:<...java.lang.String]}={[b [java.lang.String]]}>",
e.getMessage());
}
}
@Test
public void testAssertEquals_map_key_type_fail() {
// GIVEN
ImmutableMap<Integer, String> expected = ImmutableMap.of(4, "a");
ImmutableMap<String, String> actual = ImmutableMap.of("b", "b");
try {
// WHEN
GAssert.assertEquals(expected, actual);
fail();
} catch (ComparisonFailure e) {
// THEN
assertEquals(
"expected:<{[4 [java.lang.Integer]}={a] [java.lang.String]}>" //
+ " but was:<{[b [java.lang.String]}={b] [java.lang.String]}>",
e.getMessage());
}
}
public static int getLevenshteinDistance(final String s, final String t) {
GAssert.notNull(s, "s");
GAssert.notNull(t, "t");
/*
The difference between this impl. and the previous is that, rather
than creating and retaining a matrix of size s.length()+1 by t.length()+1,
we maintain two single-dimensional arrays of length s.length()+1. The first, d,
is the 'current working' distance array that maintains the newest distance cost
counts as we iterate through the characters of String s. Each time we increment
the index of String t we are comparing, d is copied to p, the second int[]. Doing so
allows us to retain the previous cost counts as required by the algorithm (taking
the minimum of the cost count to the left, up one, and diagonally up and to the left
of the current cost count being calculated). (Note that the arrays aren't really
copied anymore, just switched...this is clearly much better than cloning an array
or doing a System.arraycopy() each time through the outer loop.)
Effectively, the difference between the two implementations is this one does not
cause an out of memory condition when calculating the LD over two very large strings.
*/
final int n = s.length(); // length of s
final int m = t.length(); // length of t
if (n == 0) {
return m;
} else if (m == 0) {
return n;
}
int p[] = new int[n + 1]; // 'previous' cost array, horizontally
int d[] = new int[n + 1]; // cost array, horizontally
int _d[]; // placeholder to assist in swapping p and d
// indexes into strings s and t
int i; // iterates through s
int j; // iterates through t
char t_j; // jth character of t
int cost; // cost
for (i = 0; i <= n; i++) {
p[i] = i;
}
for (j = 1; j <= m; j++) {
t_j = t.charAt(j - 1);
d[0] = j;
for (i = 1; i <= n; i++) {
cost = s.charAt(i - 1) == t_j ? 0 : 1;
// minimum of cell to the left+1, to the top+1, diagonally left and up +cost
d[i] = Math.min(Math.min(d[i - 1] + 1, p[i] + 1), p[i - 1] + cost);
}
// copy current distance counts to 'previous row' distance counts
_d = p;
p = d;
d = _d;
}
// our last action in the above loop was to switch d and p, so p now
// actually has the most recent cost counts
return p[n];
}
