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63 changes: 63 additions & 0 deletions
63
jvm/selfie-lib/src/commonMain/kotlin/com/diffplug/selfie/guts/SnapshotNotEqualErrorMsg.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| /* | ||
| * Copyright (C) 2024 DiffPlug | ||
| * | ||
| * 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 | ||
| * | ||
| * https://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.diffplug.selfie.guts | ||
|
|
||
| object SnapshotNotEqualErrorMsg { | ||
| const val REASONABLE_LINE_LENGTH = 120 | ||
| fun forUnequalStrings(expected: String, actual: String): String { | ||
| var lineNumber = 1 | ||
| var columnNumber = 1 | ||
| var index = 0 | ||
|
|
||
| while (index < expected.length && index < actual.length) { | ||
| val expectedChar = expected[index] | ||
| val actualChar = actual[index] | ||
| if (expectedChar != actualChar) { | ||
| val endOfLineExpected = | ||
| expected.indexOf('\n', index).let { if (it == -1) expected.length else it } | ||
| val endOfLineActual = | ||
| actual.indexOf('\n', index).let { if (it == -1) actual.length else it } | ||
| val expectedLine = expected.substring(index - columnNumber + 1, endOfLineExpected) | ||
| val actualLine = actual.substring(index - columnNumber + 1, endOfLineActual) | ||
| return "Snapshot mismatch at L$lineNumber:C$columnNumber\n-$expectedLine\n+$actualLine" | ||
| } | ||
| if (expectedChar == '\n') { | ||
| lineNumber++ | ||
| columnNumber = 1 | ||
| } else { | ||
| columnNumber++ | ||
| } | ||
| index++ | ||
| } | ||
| val endOfLineExpected = | ||
| expected.indexOf('\n', index).let { if (it == -1) expected.length else it } | ||
| val endOfLineActual = actual.indexOf('\n', index).let { if (it == -1) actual.length else it } | ||
|
|
||
| if (endOfLineActual == endOfLineExpected) { | ||
| // it ended at a line break | ||
| val longer = if (actual.length > expected.length) actual else expected | ||
| val added = if (actual.length > expected.length) "+" else "-" | ||
| val endIdx = | ||
| longer.indexOf('\n', endOfLineActual + 1).let { if (it == -1) longer.length else it } | ||
| val line = longer.substring(endOfLineActual + 1, endIdx) | ||
| return "Snapshot mismatch at L${lineNumber+1}:C1 - line(s) ${if (added == "+") "added" else "removed"}\n${added}$line" | ||
| } else { | ||
| val expectedLine = expected.substring(index - columnNumber + 1, endOfLineExpected) | ||
| val actualLine = actual.substring(index - columnNumber + 1, endOfLineActual) | ||
| return "Snapshot mismatch at L$lineNumber:C$columnNumber\n-$expectedLine\n+$actualLine" | ||
| } | ||
| } | ||
| } |
97 changes: 97 additions & 0 deletions
97
...selfie-lib/src/commonTest/kotlin/com/diffplug/selfie/guts/SnapshotNotEqualErrorMsgTest.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| /* | ||
| * Copyright (C) 2024 DiffPlug | ||
| * | ||
| * 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 | ||
| * | ||
| * https://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.diffplug.selfie.guts | ||
|
|
||
| import io.kotest.matchers.shouldBe | ||
| import kotlin.test.Test | ||
|
|
||
| class SnapshotNotEqualErrorMsgTest { | ||
| @Test | ||
| fun errorLine1() { | ||
| SnapshotNotEqualErrorMsg.forUnequalStrings("Testing 123", "Testing ABC") shouldBe | ||
| """Snapshot mismatch at L1:C9 | ||
| -Testing 123 | ||
| +Testing ABC""" | ||
|
|
||
| SnapshotNotEqualErrorMsg.forUnequalStrings("123 Testing", "ABC Testing") shouldBe | ||
| """Snapshot mismatch at L1:C1 | ||
| -123 Testing | ||
| +ABC Testing""" | ||
| } | ||
|
|
||
| @Test | ||
| fun errorLine2() { | ||
| SnapshotNotEqualErrorMsg.forUnequalStrings("Line\nTesting 123", "Line\nTesting ABC") shouldBe | ||
| """Snapshot mismatch at L2:C9 | ||
| -Testing 123 | ||
| +Testing ABC""" | ||
|
|
||
| SnapshotNotEqualErrorMsg.forUnequalStrings("Line\n123 Testing", "Line\nABC Testing") shouldBe | ||
| """Snapshot mismatch at L2:C1 | ||
| -123 Testing | ||
| +ABC Testing""" | ||
| } | ||
|
|
||
| @Test | ||
| fun extraLine1() { | ||
| SnapshotNotEqualErrorMsg.forUnequalStrings("123", "123ABC") shouldBe | ||
| """Snapshot mismatch at L1:C4 | ||
| -123 | ||
| +123ABC""" | ||
| SnapshotNotEqualErrorMsg.forUnequalStrings("123ABC", "123") shouldBe | ||
| """Snapshot mismatch at L1:C4 | ||
| -123ABC | ||
| +123""" | ||
| } | ||
|
|
||
| @Test | ||
| fun extraLine2() { | ||
| SnapshotNotEqualErrorMsg.forUnequalStrings("line\n123", "line\n123ABC") shouldBe | ||
| """Snapshot mismatch at L2:C4 | ||
| -123 | ||
| +123ABC""" | ||
| SnapshotNotEqualErrorMsg.forUnequalStrings("line\n123ABC", "line\n123") shouldBe | ||
| """Snapshot mismatch at L2:C4 | ||
| -123ABC | ||
| +123""" | ||
| } | ||
|
|
||
| @Test | ||
| fun extraLine() { | ||
| SnapshotNotEqualErrorMsg.forUnequalStrings("line", "line\nnext") shouldBe | ||
| """Snapshot mismatch at L2:C1 - line(s) added | ||
| +next""" | ||
| SnapshotNotEqualErrorMsg.forUnequalStrings("line\nnext", "line") shouldBe | ||
| """Snapshot mismatch at L2:C1 - line(s) removed | ||
| -next""" | ||
| } | ||
|
|
||
| @Test | ||
| fun extraNewline() { | ||
| SnapshotNotEqualErrorMsg.forUnequalStrings("line", "line\n") shouldBe | ||
| """Snapshot mismatch at L2:C1 - line(s) added | ||
| +""" | ||
| SnapshotNotEqualErrorMsg.forUnequalStrings("line\n", "line") shouldBe | ||
| """Snapshot mismatch at L2:C1 - line(s) removed | ||
| -""" | ||
| SnapshotNotEqualErrorMsg.forUnequalStrings("", "\n") shouldBe | ||
| """Snapshot mismatch at L2:C1 - line(s) added | ||
| +""" | ||
| SnapshotNotEqualErrorMsg.forUnequalStrings("\n", "") shouldBe | ||
| """Snapshot mismatch at L2:C1 - line(s) removed | ||
| -""" | ||
| } | ||
| } |
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