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Diffstat (limited to 'javatests/com/google/gerrit/server/patch/IntraLineLoaderTest.java')
-rw-r--r-- | javatests/com/google/gerrit/server/patch/IntraLineLoaderTest.java | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/javatests/com/google/gerrit/server/patch/IntraLineLoaderTest.java b/javatests/com/google/gerrit/server/patch/IntraLineLoaderTest.java new file mode 100644 index 0000000000..ef80d7ef33 --- /dev/null +++ b/javatests/com/google/gerrit/server/patch/IntraLineLoaderTest.java @@ -0,0 +1,213 @@ +// Copyright (C) 2016 The Android Open Source Project +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package com.google.gerrit.server.patch; + +import static com.google.common.truth.Truth.assertThat; +import static java.nio.charset.StandardCharsets.UTF_8; + +import com.google.common.collect.ImmutableList; +import com.google.common.collect.ImmutableSet; +import java.util.List; +import org.eclipse.jgit.diff.Edit; +import org.eclipse.jgit.diff.EditList; +import org.eclipse.jgit.diff.ReplaceEdit; +import org.junit.Test; + +public class IntraLineLoaderTest { + + @Test + public void rewriteAtStartOfLineIsRecognized() throws Exception { + String a = "abc1\n"; + String b = "def1\n"; + assertThat(intraline(a, b)).isEqualTo(ref().replace("abc", "def").common("1\n").edits); + } + + @Test + public void rewriteAtEndOfLineIsRecognized() throws Exception { + String a = "abc1\n"; + String b = "abc2\n"; + assertThat(intraline(a, b)).isEqualTo(ref().common("abc").replace("1", "2").common("\n").edits); + } + + @Test + public void completeRewriteIncludesNewline() throws Exception { + String a = "abc1\n"; + String b = "def2\n"; + assertThat(intraline(a, b)).isEqualTo(ref().replace("abc1\n", "def2\n").edits); + } + + @Test + public void closeEditsAreCombined() throws Exception { + String a = "ab1cdef2gh\n"; + String b = "ab2cdef3gh\n"; + assertThat(intraline(a, b)) + .isEqualTo(ref().common("ab").replace("1cdef2", "2cdef3").common("gh\n").edits); + } + + @Test + public void preferInsertAfterCommonPart1() throws Exception { + String a = "start middle end\n"; + String b = "start middlemiddle end\n"; + assertThat(intraline(a, b)) + .isEqualTo(ref().common("start middle").insert("middle").common(" end\n").edits); + } + + @Test + public void preferInsertAfterCommonPart2() throws Exception { + String a = "abc def\n"; + String b = "abc def\n"; + assertThat(intraline(a, b)).isEqualTo(ref().common("abc ").insert(" ").common("def\n").edits); + } + + @Test + public void preferInsertAtLineBreak1() throws Exception { + String a = "multi\nline\n"; + String b = "multi\nlinemulti\nline\n"; + assertThat(intraline(a, b)).isEqualTo(wordEdit(10, 10, 6, 16)); + // better would be: + // assertThat(intraline(a, b)).isEqualTo(wordEdit(6, 6, 6, 16)); + // or the equivalent: + // assertThat(intraline(a, b)).isEqualTo(ref() + // .common("multi\n").insert("linemulti\n").common("line\n").edits + // ); + } + + // TODO: expected failure + // the current code does not work on the first line + // and the insert marker is in the wrong location + @Test(expected = AssertionError.class) + public void preferInsertAtLineBreak2() throws Exception { + String a = " abc\n def\n"; + String b = " abc\n def\n"; + assertThat(intraline(a, b)) + .isEqualTo(ref().insert(" ").common(" abc\n").insert(" ").common(" def\n").edits); + } + + // TODO: expected failure + // the current code does not work on the first line + @Test(expected = AssertionError.class) + public void preferDeleteAtLineBreak() throws Exception { + String a = " abc\n def\n"; + String b = " abc\n def\n"; + assertThat(intraline(a, b)) + .isEqualTo(ref().remove(" ").common(" abc\n").remove(" ").common(" def\n").edits); + } + + @Test + public void insertedWhitespaceIsRecognized() throws Exception { + String a = " int *foobar\n"; + String b = " int * foobar\n"; + assertThat(intraline(a, b)) + .isEqualTo(ref().common(" int *").insert(" ").common("foobar\n").edits); + } + + @Test + public void insertedWhitespaceIsRecognizedInMultipleLines() throws Exception { + // |0 5 10 | 5 20 5 30 + String a = " int *foobar\n int *foobar\n"; + String b = " int * foobar\n int * foobar\n"; + assertThat(intraline(a, b)) + .isEqualTo( + ref() + .common(" int *") + .insert(" ") + .common("foobar\n") + .common(" int *") + .insert(" ") + .common("foobar\n") + .edits); + } + + // helper functions to call IntraLineLoader.compute + + private static int countLines(String s) { + int count = 0; + for (int i = 0; i < s.length(); i++) { + if (s.charAt(i) == '\n') { + count++; + } + } + return count; + } + + private static List<Edit> intraline(String a, String b) throws Exception { + return intraline(a, b, new Edit(0, countLines(a), 0, countLines(b))); + } + + private static List<Edit> intraline(String a, String b, Edit lines) throws Exception { + Text aText = new Text(a.getBytes(UTF_8)); + Text bText = new Text(b.getBytes(UTF_8)); + + IntraLineDiff diff = + IntraLineLoader.compute(aText, bText, ImmutableList.of(lines), ImmutableSet.of()); + + assertThat(diff.getStatus()).isEqualTo(IntraLineDiff.Status.EDIT_LIST); + List<Edit> actualEdits = diff.getEdits(); + assertThat(actualEdits).hasSize(1); + Edit actualEdit = actualEdits.get(0); + assertThat(actualEdit.getBeginA()).isEqualTo(lines.getBeginA()); + assertThat(actualEdit.getEndA()).isEqualTo(lines.getEndA()); + assertThat(actualEdit.getBeginB()).isEqualTo(lines.getBeginB()); + assertThat(actualEdit.getEndB()).isEqualTo(lines.getEndB()); + assertThat(actualEdit).isInstanceOf(ReplaceEdit.class); + + return ((ReplaceEdit) actualEdit).getInternalEdits(); + } + + // helpers to compute reference values + + private static List<Edit> wordEdit(int as, int ae, int bs, int be) { + return EditList.singleton(new Edit(as, ae, bs, be)); + } + + private static Reference ref() { + return new Reference(); + } + + private static class Reference { + List<Edit> edits; + private int posA; + private int posB; + + Reference() { + edits = new EditList(); + posA = posB = 0; + } + + Reference common(String s) { + int len = s.length(); + posA += len; + posB += len; + return this; + } + + Reference insert(String s) { + return replace("", s); + } + + Reference remove(String s) { + return replace(s, ""); + } + + Reference replace(String a, String b) { + int lenA = a.length(); + int lenB = b.length(); + edits.add(new Edit(posA, posA + lenA, posB, posB + lenB)); + posA += lenA; + posB += lenB; + return this; + } + } +} |